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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * ACPI device specific properties support.
  *
  * Copyright (C) 2014, Intel Corporation
  * All rights reserved.
  *
  * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
  *          Darren Hart <dvhart@linux.intel.com>
  *          Rafael J. Wysocki <rafael.j.wysocki@intel.com>
  */
 
 #include <linux/acpi.h>
 #include <linux/device.h>
 #include <linux/export.h>
 
 #include "internal.h"
 
 static int acpi_data_get_property_array(const struct acpi_device_data *data,
                     const char *name,
                     acpi_object_type type,
                     const union acpi_object **obj);
 
 /*
  * The GUIDs here are made equivalent to each other in order to avoid extra
  * complexity in the properties handling code, with the caveat that the
  * kernel will accept certain combinations of GUID and properties that are
  * not defined without a warning. For instance if any of the properties
  * from different GUID appear in a property list of another, it will be
  * accepted by the kernel. Firmware validation tools should catch these.
  */
 static const guid_t prp_guids[] = {
     /* ACPI _DSD device properties GUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
     GUID_INIT(0xdaffd814, 0x6eba, 0x4d8c,
           0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01),
     /* Hotplug in D3 GUID: 6211e2c0-58a3-4af3-90e1-927a4e0c55a4 */
     GUID_INIT(0x6211e2c0, 0x58a3, 0x4af3,
           0x90, 0xe1, 0x92, 0x7a, 0x4e, 0x0c, 0x55, 0xa4),
     /* External facing port GUID: efcc06cc-73ac-4bc3-bff0-76143807c389 */
     GUID_INIT(0xefcc06cc, 0x73ac, 0x4bc3,
           0xbf, 0xf0, 0x76, 0x14, 0x38, 0x07, 0xc3, 0x89),
     /* Thunderbolt GUID for IMR_VALID: c44d002f-69f9-4e7d-a904-a7baabdf43f7 */
     GUID_INIT(0xc44d002f, 0x69f9, 0x4e7d,
           0xa9, 0x04, 0xa7, 0xba, 0xab, 0xdf, 0x43, 0xf7),
     /* Thunderbolt GUID for WAKE_SUPPORTED: 6c501103-c189-4296-ba72-9bf5a26ebe5d */
     GUID_INIT(0x6c501103, 0xc189, 0x4296,
           0xba, 0x72, 0x9b, 0xf5, 0xa2, 0x6e, 0xbe, 0x5d),
     /* Storage device needs D3 GUID: 5025030f-842f-4ab4-a561-99a5189762d0 */
     GUID_INIT(0x5025030f, 0x842f, 0x4ab4,
           0xa5, 0x61, 0x99, 0xa5, 0x18, 0x97, 0x62, 0xd0),
 };
 
 /* ACPI _DSD data subnodes GUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */
 static const guid_t ads_guid =
     GUID_INIT(0xdbb8e3e6, 0x5886, 0x4ba6,
           0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b);
 
 static const guid_t buffer_prop_guid =
     GUID_INIT(0xedb12dd0, 0x363d, 0x4085,
           0xa3, 0xd2, 0x49, 0x52, 0x2c, 0xa1, 0x60, 0xc4);
 
 static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
                        union acpi_object *desc,
                        struct acpi_device_data *data,
                        struct fwnode_handle *parent);
 static bool acpi_extract_properties(acpi_handle handle,
                     union acpi_object *desc,
                     struct acpi_device_data *data);
 
 static bool acpi_nondev_subnode_extract(union acpi_object *desc,
                     acpi_handle handle,
                     const union acpi_object *link,
                     struct list_head *list,
                     struct fwnode_handle *parent)
 {
     struct acpi_data_node *dn;
     bool result;
 
     dn = kzalloc(sizeof(*dn), GFP_KERNEL);
     if (!dn)
         return false;
 
     dn->name = link->package.elements[0].string.pointer;
     fwnode_init(&dn->fwnode, &acpi_data_fwnode_ops);
     dn->parent = parent;
     INIT_LIST_HEAD(&dn->data.properties);
     INIT_LIST_HEAD(&dn->data.subnodes);
 
     result = acpi_extract_properties(handle, desc, &dn->data);
 
     if (handle) {
         acpi_handle scope;
         acpi_status status;
 
         /*
          * The scope for the subnode object lookup is the one of the
          * namespace node (device) containing the object that has
          * returned the package.  That is, it's the scope of that
          * object's parent.
          */
         status = acpi_get_parent(handle, &scope);
         if (ACPI_SUCCESS(status)
             && acpi_enumerate_nondev_subnodes(scope, desc, &dn->data,
                               &dn->fwnode))
             result = true;
     } else if (acpi_enumerate_nondev_subnodes(NULL, desc, &dn->data,
                           &dn->fwnode)) {
         result = true;
     }
 
     if (result) {
         dn->handle = handle;
         dn->data.pointer = desc;
         list_add_tail(&dn->sibling, list);
         return true;
     }
 
     kfree(dn);
     acpi_handle_debug(handle, "Invalid properties/subnodes data, skipping\n");
     return false;
 }
 
 static bool acpi_nondev_subnode_data_ok(acpi_handle handle,
                     const union acpi_object *link,
                     struct list_head *list,
                     struct fwnode_handle *parent)
 {
     struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
     acpi_status status;
 
     status = acpi_evaluate_object_typed(handle, NULL, NULL, &buf,
                         ACPI_TYPE_PACKAGE);
     if (ACPI_FAILURE(status))
         return false;
 
     if (acpi_nondev_subnode_extract(buf.pointer, handle, link, list,
                     parent))
         return true;
 
     ACPI_FREE(buf.pointer);
     return false;
 }
 
 static bool acpi_nondev_subnode_ok(acpi_handle scope,
                    const union acpi_object *link,
                    struct list_head *list,
                    struct fwnode_handle *parent)
 {
     acpi_handle handle;
     acpi_status status;
 
     if (!scope)
         return false;
 
     status = acpi_get_handle(scope, link->package.elements[1].string.pointer,
                  &handle);
     if (ACPI_FAILURE(status))
         return false;
 
     return acpi_nondev_subnode_data_ok(handle, link, list, parent);
 }
 
 static bool acpi_add_nondev_subnodes(acpi_handle scope,
                      union acpi_object *links,
                      struct list_head *list,
                      struct fwnode_handle *parent)
 {
     bool ret = false;
     int i;
 
     for (i = 0; i < links->package.count; i++) {
         union acpi_object *link, *desc;
         acpi_handle handle;
         bool result;
 
         link = &links->package.elements[i];
         /* Only two elements allowed. */
         if (link->package.count != 2)
             continue;
 
         /* The first one must be a string. */
         if (link->package.elements[0].type != ACPI_TYPE_STRING)
             continue;
 
         /* The second one may be a string, a reference or a package. */
         switch (link->package.elements[1].type) {
         case ACPI_TYPE_STRING:
             result = acpi_nondev_subnode_ok(scope, link, list,
                              parent);
             break;
         case ACPI_TYPE_LOCAL_REFERENCE:
             handle = link->package.elements[1].reference.handle;
             result = acpi_nondev_subnode_data_ok(handle, link, list,
                                  parent);
             break;
         case ACPI_TYPE_PACKAGE:
             desc = &link->package.elements[1];
             result = acpi_nondev_subnode_extract(desc, NULL, link,
                                  list, parent);
             break;
         default:
             result = false;
             break;
         }
         ret = ret || result;
     }
 
     return ret;
 }
 
 static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
                        union acpi_object *desc,
                        struct acpi_device_data *data,
                        struct fwnode_handle *parent)
 {
     int i;
 
     /* Look for the ACPI data subnodes GUID. */
     for (i = 0; i < desc->package.count; i += 2) {
         const union acpi_object *guid;
         union acpi_object *links;
 
         guid = &desc->package.elements[i];
         links = &desc->package.elements[i + 1];
 
         /*
          * The first element must be a GUID and the second one must be
          * a package.
          */
         if (guid->type != ACPI_TYPE_BUFFER ||
             guid->buffer.length != 16 ||
             links->type != ACPI_TYPE_PACKAGE)
             break;
 
         if (!guid_equal((guid_t *)guid->buffer.pointer, &ads_guid))
             continue;
 
         return acpi_add_nondev_subnodes(scope, links, &data->subnodes,
                         parent);
     }
 
     return false;
 }
 
 static bool acpi_property_value_ok(const union acpi_object *value)
 {
     int j;
 
     /*
      * The value must be an integer, a string, a reference, or a package
      * whose every element must be an integer, a string, or a reference.
      */
     switch (value->type) {
     case ACPI_TYPE_INTEGER:
     case ACPI_TYPE_STRING:
     case ACPI_TYPE_LOCAL_REFERENCE:
         return true;
 
     case ACPI_TYPE_PACKAGE:
         for (j = 0; j < value->package.count; j++)
             switch (value->package.elements[j].type) {
             case ACPI_TYPE_INTEGER:
             case ACPI_TYPE_STRING:
             case ACPI_TYPE_LOCAL_REFERENCE:
                 continue;
 
             default:
                 return false;
             }
 
         return true;
     }
     return false;
 }
 
 static bool acpi_properties_format_valid(const union acpi_object *properties)
 {
     int i;
 
     for (i = 0; i < properties->package.count; i++) {
         const union acpi_object *property;
 
         property = &properties->package.elements[i];
         /*
          * Only two elements allowed, the first one must be a string and
          * the second one has to satisfy certain conditions.
          */
         if (property->package.count != 2
             || property->package.elements[0].type != ACPI_TYPE_STRING
             || !acpi_property_value_ok(&property->package.elements[1]))
             return false;
     }
     return true;
 }
 
 static void acpi_init_of_compatible(struct acpi_device *adev)
 {
     const union acpi_object *of_compatible;
     int ret;
 
     ret = acpi_data_get_property_array(&adev->data, "compatible",
                        ACPI_TYPE_STRING, &of_compatible);
     if (ret) {
         ret = acpi_dev_get_property(adev, "compatible",
                         ACPI_TYPE_STRING, &of_compatible);
         if (ret) {
             if (adev->parent
                 && adev->parent->flags.of_compatible_ok)
                 goto out;
 
             return;
         }
     }
     adev->data.of_compatible = of_compatible;
 
  out:
     adev->flags.of_compatible_ok = 1;
 }
 
 static bool acpi_is_property_guid(const guid_t *guid)
 {
     int i;
 
     for (i = 0; i < ARRAY_SIZE(prp_guids); i++) {
         if (guid_equal(guid, &prp_guids[i]))
             return true;
     }
 
     return false;
 }
 
 struct acpi_device_properties *
 acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
             union acpi_object *properties)
 {
     struct acpi_device_properties *props;
 
     props = kzalloc(sizeof(*props), GFP_KERNEL);
     if (props) {
         INIT_LIST_HEAD(&props->list);
         props->guid = guid;
         props->properties = properties;
         list_add_tail(&props->list, &data->properties);
     }
 
     return props;
 }
 
 static void acpi_nondev_subnode_tag(acpi_handle handle, void *context)
 {
 }
 
 static void acpi_untie_nondev_subnodes(struct acpi_device_data *data)
 {
     struct acpi_data_node *dn;
 
     list_for_each_entry(dn, &data->subnodes, sibling) {
         acpi_detach_data(dn->handle, acpi_nondev_subnode_tag);
 
         acpi_untie_nondev_subnodes(&dn->data);
     }
 }
 
 static bool acpi_tie_nondev_subnodes(struct acpi_device_data *data)
 {
     struct acpi_data_node *dn;
 
     list_for_each_entry(dn, &data->subnodes, sibling) {
         acpi_status status;
         bool ret;
 
         status = acpi_attach_data(dn->handle, acpi_nondev_subnode_tag, dn);
         if (ACPI_FAILURE(status) && status != AE_ALREADY_EXISTS) {
             acpi_handle_err(dn->handle, "Can't tag data node\n");
             return false;
         }
 
         ret = acpi_tie_nondev_subnodes(&dn->data);
         if (!ret)
             return ret;
     }
 
     return true;
 }
 
 static void acpi_data_add_buffer_props(acpi_handle handle,
                        struct acpi_device_data *data,
                        union acpi_object *properties)
 {
     struct acpi_device_properties *props;
     union acpi_object *package;
     size_t alloc_size;
     unsigned int i;
     u32 *count;
 
     if (check_mul_overflow((size_t)properties->package.count,
                    sizeof(*package) + sizeof(void *),
                    &alloc_size) ||
         check_add_overflow(sizeof(*props) + sizeof(*package), alloc_size,
                    &alloc_size)) {
         acpi_handle_warn(handle,
                  "can't allocate memory for %u buffer props",
                  properties->package.count);
         return;
     }
 
     props = kvzalloc(alloc_size, GFP_KERNEL);
     if (!props)
         return;
 
     props->guid = &buffer_prop_guid;
     props->bufs = (void *)(props + 1);
     props->properties = (void *)(props->bufs + properties->package.count);
 
     /* Outer package */
     package = props->properties;
     package->type = ACPI_TYPE_PACKAGE;
     package->package.elements = package + 1;
     count = &package->package.count;
     *count = 0;
 
     /* Inner packages */
     package++;
 
     for (i = 0; i < properties->package.count; i++) {
         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
         union acpi_object *property = &properties->package.elements[i];
         union acpi_object *prop, *obj, *buf_obj;
         acpi_status status;
 
         if (property->type != ACPI_TYPE_PACKAGE ||
             property->package.count != 2) {
             acpi_handle_warn(handle,
                      "buffer property %u has %u entries\n",
                      i, property->package.count);
             continue;
         }
 
         prop = &property->package.elements[0];
         obj = &property->package.elements[1];
 
         if (prop->type != ACPI_TYPE_STRING ||
             obj->type != ACPI_TYPE_STRING) {
             acpi_handle_warn(handle,
                      "wrong object types %u and %u\n",
                      prop->type, obj->type);
             continue;
         }
 
         status = acpi_evaluate_object_typed(handle, obj->string.pointer,
                             NULL, &buf,
                             ACPI_TYPE_BUFFER);
         if (ACPI_FAILURE(status)) {
             acpi_handle_warn(handle,
                      "can't evaluate \"%*pE\" as buffer\n",
                      obj->string.length,
                      obj->string.pointer);
             continue;
         }
 
         package->type = ACPI_TYPE_PACKAGE;
         package->package.elements = prop;
         package->package.count = 2;
 
         buf_obj = buf.pointer;
 
         /* Replace the string object with a buffer object */
         obj->type = ACPI_TYPE_BUFFER;
         obj->buffer.length = buf_obj->buffer.length;
         obj->buffer.pointer = buf_obj->buffer.pointer;
 
         props->bufs[i] = buf.pointer;
         package++;
         (*count)++;
     }
 
     if (*count)
         list_add(&props->list, &data->properties);
     else
         kvfree(props);
 }
 
 static bool acpi_extract_properties(acpi_handle scope, union acpi_object *desc,
                     struct acpi_device_data *data)
 {
     int i;
 
     if (desc->package.count % 2)
         return false;
 
     /* Look for the device properties GUID. */
     for (i = 0; i < desc->package.count; i += 2) {
         const union acpi_object *guid;
         union acpi_object *properties;
 
         guid = &desc->package.elements[i];
         properties = &desc->package.elements[i + 1];
 
         /*
          * The first element must be a GUID and the second one must be
          * a package.
          */
         if (guid->type != ACPI_TYPE_BUFFER ||
             guid->buffer.length != 16 ||
             properties->type != ACPI_TYPE_PACKAGE)
             break;
 
         if (guid_equal((guid_t *)guid->buffer.pointer,
                    &buffer_prop_guid)) {
             acpi_data_add_buffer_props(scope, data, properties);
             continue;
         }
 
         if (!acpi_is_property_guid((guid_t *)guid->buffer.pointer))
             continue;
 
         /*
          * We found the matching GUID. Now validate the format of the
          * package immediately following it.
          */
         if (!acpi_properties_format_valid(properties))
             continue;
 
         acpi_data_add_props(data, (const guid_t *)guid->buffer.pointer,
                     properties);
     }
 
     return !list_empty(&data->properties);
 }
 
 void acpi_init_properties(struct acpi_device *adev)
 {
     struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
     struct acpi_hardware_id *hwid;
     acpi_status status;
     bool acpi_of = false;
 
     INIT_LIST_HEAD(&adev->data.properties);
     INIT_LIST_HEAD(&adev->data.subnodes);
 
     if (!adev->handle)
         return;
 
     /*
      * Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in
      * Device Tree compatible properties for this device.
      */
     list_for_each_entry(hwid, &adev->pnp.ids, list) {
         if (!strcmp(hwid->id, ACPI_DT_NAMESPACE_HID)) {
             acpi_of = true;
             break;
         }
     }
 
     status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, &buf,
                         ACPI_TYPE_PACKAGE);
     if (ACPI_FAILURE(status))
         goto out;
 
     if (acpi_extract_properties(adev->handle, buf.pointer, &adev->data)) {
         adev->data.pointer = buf.pointer;
         if (acpi_of)
             acpi_init_of_compatible(adev);
     }
     if (acpi_enumerate_nondev_subnodes(adev->handle, buf.pointer,
                     &adev->data, acpi_fwnode_handle(adev)))
         adev->data.pointer = buf.pointer;
 
     if (!adev->data.pointer) {
         acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n");
         ACPI_FREE(buf.pointer);
     } else {
         if (!acpi_tie_nondev_subnodes(&adev->data))
             acpi_untie_nondev_subnodes(&adev->data);
     }
 
  out:
     if (acpi_of && !adev->flags.of_compatible_ok)
         acpi_handle_info(adev->handle,
              ACPI_DT_NAMESPACE_HID " requires 'compatible' property\n");
 
     if (!adev->data.pointer)
         acpi_extract_apple_properties(adev);
 }
 
 static void acpi_free_device_properties(struct list_head *list)
 {
     struct acpi_device_properties *props, *tmp;
 
     list_for_each_entry_safe(props, tmp, list, list) {
         u32 i;
 
         list_del(&props->list);
         /* Buffer data properties were separately allocated */
         if (props->bufs)
             for (i = 0; i < props->properties->package.count; i++)
                 ACPI_FREE(props->bufs[i]);
         kvfree(props);
     }
 }
 
 static void acpi_destroy_nondev_subnodes(struct list_head *list)
 {
     struct acpi_data_node *dn, *next;
 
     if (list_empty(list))
         return;
 
     list_for_each_entry_safe_reverse(dn, next, list, sibling) {
         acpi_destroy_nondev_subnodes(&dn->data.subnodes);
         wait_for_completion(&dn->kobj_done);
         list_del(&dn->sibling);
         ACPI_FREE((void *)dn->data.pointer);
         acpi_free_device_properties(&dn->data.properties);
         kfree(dn);
     }
 }
 
 void acpi_free_properties(struct acpi_device *adev)
 {
     acpi_untie_nondev_subnodes(&adev->data);
     acpi_destroy_nondev_subnodes(&adev->data.subnodes);
     ACPI_FREE((void *)adev->data.pointer);
     adev->data.of_compatible = NULL;
     adev->data.pointer = NULL;
     acpi_free_device_properties(&adev->data.properties);
 }
 
 /**
  * acpi_data_get_property - return an ACPI property with given name
  * @data: ACPI device deta object to get the property from
  * @name: Name of the property
  * @type: Expected property type
  * @obj: Location to store the property value (if not %NULL)
  *
  * Look up a property with @name and store a pointer to the resulting ACPI
  * object at the location pointed to by @obj if found.
  *
  * Callers must not attempt to free the returned objects.  These objects will be
  * freed by the ACPI core automatically during the removal of @data.
  *
  * Return: %0 if property with @name has been found (success),
  *         %-EINVAL if the arguments are invalid,
  *         %-EINVAL if the property doesn't exist,
  *         %-EPROTO if the property value type doesn't match @type.
  */
 static int acpi_data_get_property(const struct acpi_device_data *data,
                   const char *name, acpi_object_type type,
                   const union acpi_object **obj)
 {
     const struct acpi_device_properties *props;
 
     if (!data || !name)
         return -EINVAL;
 
     if (!data->pointer || list_empty(&data->properties))
         return -EINVAL;
 
     list_for_each_entry(props, &data->properties, list) {
         const union acpi_object *properties;
         unsigned int i;
 
         properties = props->properties;
         for (i = 0; i < properties->package.count; i++) {
             const union acpi_object *propname, *propvalue;
             const union acpi_object *property;
 
             property = &properties->package.elements[i];
 
             propname = &property->package.elements[0];
             propvalue = &property->package.elements[1];
 
             if (!strcmp(name, propname->string.pointer)) {
                 if (type != ACPI_TYPE_ANY &&
                     propvalue->type != type)
                     return -EPROTO;
                 if (obj)
                     *obj = propvalue;
 
                 return 0;
             }
         }
     }
     return -EINVAL;
 }
 
 /**
  * acpi_dev_get_property - return an ACPI property with given name.
  * @adev: ACPI device to get the property from.
  * @name: Name of the property.
  * @type: Expected property type.
  * @obj: Location to store the property value (if not %NULL).
  */
 int acpi_dev_get_property(const struct acpi_device *adev, const char *name,
               acpi_object_type type, const union acpi_object **obj)
 {
     return adev ? acpi_data_get_property(&adev->data, name, type, obj) : -EINVAL;
 }
 EXPORT_SYMBOL_GPL(acpi_dev_get_property);
 
 static const struct acpi_device_data *
 acpi_device_data_of_node(const struct fwnode_handle *fwnode)
 {
     if (is_acpi_device_node(fwnode)) {
         const struct acpi_device *adev = to_acpi_device_node(fwnode);
         return &adev->data;
     }
     if (is_acpi_data_node(fwnode)) {
         const struct acpi_data_node *dn = to_acpi_data_node(fwnode);
         return &dn->data;
     }
     return NULL;
 }
 
 /**
  * acpi_node_prop_get - return an ACPI property with given name.
  * @fwnode: Firmware node to get the property from.
  * @propname: Name of the property.
  * @valptr: Location to store a pointer to the property value (if not %NULL).
  */
 int acpi_node_prop_get(const struct fwnode_handle *fwnode,
                const char *propname, void **valptr)
 {
     return acpi_data_get_property(acpi_device_data_of_node(fwnode),
                       propname, ACPI_TYPE_ANY,
                       (const union acpi_object **)valptr);
 }
 
 /**
  * acpi_data_get_property_array - return an ACPI array property with given name
  * @data: ACPI data object to get the property from
  * @name: Name of the property
  * @type: Expected type of array elements
  * @obj: Location to store a pointer to the property value (if not NULL)
  *
  * Look up an array property with @name and store a pointer to the resulting
  * ACPI object at the location pointed to by @obj if found.
  *
  * Callers must not attempt to free the returned objects.  Those objects will be
  * freed by the ACPI core automatically during the removal of @data.
  *
  * Return: %0 if array property (package) with @name has been found (success),
  *         %-EINVAL if the arguments are invalid,
  *         %-EINVAL if the property doesn't exist,
  *         %-EPROTO if the property is not a package or the type of its elements
  *           doesn't match @type.
  */
 static int acpi_data_get_property_array(const struct acpi_device_data *data,
                     const char *name,
                     acpi_object_type type,
                     const union acpi_object **obj)
 {
     const union acpi_object *prop;
     int ret, i;
 
     ret = acpi_data_get_property(data, name, ACPI_TYPE_PACKAGE, &prop);
     if (ret)
         return ret;
 
     if (type != ACPI_TYPE_ANY) {
         /* Check that all elements are of correct type. */
         for (i = 0; i < prop->package.count; i++)
             if (prop->package.elements[i].type != type)
                 return -EPROTO;
     }
     if (obj)
         *obj = prop;
 
     return 0;
 }
 
 static struct fwnode_handle *
 acpi_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
                  const char *childname)
 {
     struct fwnode_handle *child;
 
     fwnode_for_each_child_node(fwnode, child) {
         if (is_acpi_data_node(child)) {
             if (acpi_data_node_match(child, childname))
                 return child;
             continue;
         }
 
         if (!strncmp(acpi_device_bid(to_acpi_device_node(child)),
                  childname, ACPI_NAMESEG_SIZE))
             return child;
     }
 
     return NULL;
 }
 
 static int acpi_get_ref_args(struct fwnode_reference_args *args,
                  struct fwnode_handle *ref_fwnode,
                  const union acpi_object **element,
                  const union acpi_object *end, size_t num_args)
 {
     u32 nargs = 0, i;
 
     /*
      * Find the referred data extension node under the
      * referred device node.
      */
     for (; *element < end && (*element)->type == ACPI_TYPE_STRING;
          (*element)++) {
         const char *child_name = (*element)->string.pointer;
 
         ref_fwnode = acpi_fwnode_get_named_child_node(ref_fwnode, child_name);
         if (!ref_fwnode)
             return -EINVAL;
     }
 
     /*
      * Assume the following integer elements are all args. Stop counting on
      * the first reference or end of the package arguments. In case of
      * neither reference, nor integer, return an error, we can't parse it.
      */
     for (i = 0; (*element) + i < end && i < num_args; i++) {
         acpi_object_type type = (*element)[i].type;
 
         if (type == ACPI_TYPE_LOCAL_REFERENCE)
             break;
 
         if (type == ACPI_TYPE_INTEGER)
             nargs++;
         else
             return -EINVAL;
     }
 
     if (nargs > NR_FWNODE_REFERENCE_ARGS)
         return -EINVAL;
 
     if (args) {
         args->fwnode = ref_fwnode;
         args->nargs = nargs;
         for (i = 0; i < nargs; i++)
             args->args[i] = (*element)[i].integer.value;
     }
 
     (*element) += nargs;
 
     return 0;
 }
 
 /**
  * __acpi_node_get_property_reference - returns handle to the referenced object
  * @fwnode: Firmware node to get the property from
  * @propname: Name of the property
  * @index: Index of the reference to return
  * @num_args: Maximum number of arguments after each reference
  * @args: Location to store the returned reference with optional arguments
  *
  * Find property with @name, verifify that it is a package containing at least
  * one object reference and if so, store the ACPI device object pointer to the
  * target object in @args->adev.  If the reference includes arguments, store
  * them in the @args->args[] array.
  *
  * If there's more than one reference in the property value package, @index is
  * used to select the one to return.
  *
  * It is possible to leave holes in the property value set like in the
  * example below:
  *
  * Package () {
  *     "cs-gpios",
  *     Package () {
  *        ^GPIO, 19, 0, 0,
  *        ^GPIO, 20, 0, 0,
  *        0,
  *        ^GPIO, 21, 0, 0,
  *     }
  * }
  *
  * Calling this function with index %2 or index %3 return %-ENOENT. If the
  * property does not contain any more values %-ENOENT is returned. The NULL
  * entry must be single integer and preferably contain value %0.
  *
  * Return: %0 on success, negative error code on failure.
  */
 int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
     const char *propname, size_t index, size_t num_args,
     struct fwnode_reference_args *args)
 {
     const union acpi_object *element, *end;
     const union acpi_object *obj;
     const struct acpi_device_data *data;
     struct acpi_device *device;
     int ret, idx = 0;
 
     data = acpi_device_data_of_node(fwnode);
     if (!data)
         return -ENOENT;
 
     ret = acpi_data_get_property(data, propname, ACPI_TYPE_ANY, &obj);
     if (ret)
         return ret == -EINVAL ? -ENOENT : -EINVAL;
 
     switch (obj->type) {
     case ACPI_TYPE_LOCAL_REFERENCE:
         /* Plain single reference without arguments. */
         if (index)
             return -ENOENT;
 
         device = acpi_fetch_acpi_dev(obj->reference.handle);
         if (!device)
             return -EINVAL;
 
         args->fwnode = acpi_fwnode_handle(device);
         args->nargs = 0;
         return 0;
     case ACPI_TYPE_PACKAGE:
         /*
          * If it is not a single reference, then it is a package of
          * references followed by number of ints as follows:
          *
          *  Package () { REF, INT, REF, INT, INT }
          *
          * The index argument is then used to determine which reference
          * the caller wants (along with the arguments).
          */
         break;
     default:
         return -EINVAL;
     }
 
     if (index >= obj->package.count)
         return -ENOENT;
 
     element = obj->package.elements;
     end = element + obj->package.count;
 
     while (element < end) {
         switch (element->type) {
         case ACPI_TYPE_LOCAL_REFERENCE:
             device = acpi_fetch_acpi_dev(element->reference.handle);
             if (!device)
                 return -EINVAL;
 
             element++;
 
             ret = acpi_get_ref_args(idx == index ? args : NULL,
                         acpi_fwnode_handle(device),
                         &element, end, num_args);
             if (ret < 0)
                 return ret;
 
             if (idx == index)
                 return 0;
 
             break;
         case ACPI_TYPE_INTEGER:
             if (idx == index)
                 return -ENOENT;
             element++;
             break;
         default:
             return -EINVAL;
         }
 
         idx++;
     }
 
     return -ENOENT;
 }
 EXPORT_SYMBOL_GPL(__acpi_node_get_property_reference);
 
 static int acpi_data_prop_read_single(const struct acpi_device_data *data,
                       const char *propname,
                       enum dev_prop_type proptype, void *val)
 {
     const union acpi_object *obj;
     int ret;
 
     if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) {
         ret = acpi_data_get_property(data, propname, ACPI_TYPE_INTEGER, &obj);
         if (ret)
             return ret;
 
         switch (proptype) {
         case DEV_PROP_U8:
             if (obj->integer.value > U8_MAX)
                 return -EOVERFLOW;
 
             if (val)
                 *(u8 *)val = obj->integer.value;
 
             break;
         case DEV_PROP_U16:
             if (obj->integer.value > U16_MAX)
                 return -EOVERFLOW;
 
             if (val)
                 *(u16 *)val = obj->integer.value;
 
             break;
         case DEV_PROP_U32:
             if (obj->integer.value > U32_MAX)
                 return -EOVERFLOW;
 
             if (val)
                 *(u32 *)val = obj->integer.value;
 
             break;
         default:
             if (val)
                 *(u64 *)val = obj->integer.value;
 
             break;
         }
 
         if (!val)
             return 1;
     } else if (proptype == DEV_PROP_STRING) {
         ret = acpi_data_get_property(data, propname, ACPI_TYPE_STRING, &obj);
         if (ret)
             return ret;
 
         if (val)
             *(char **)val = obj->string.pointer;
 
         return 1;
     } else {
         ret = -EINVAL;
     }
     return ret;
 }
 
 #define acpi_copy_property_array_uint(items, val, nval)         \
     ({                              \
         typeof(items) __items = items;              \
         typeof(val) __val = val;                \
         typeof(nval) __nval = nval;             \
         size_t i;                       \
         int ret = 0;                        \
                                     \
         for (i = 0; i < __nval; i++) {              \
             if (__items->type == ACPI_TYPE_BUFFER) {    \
                 __val[i] = __items->buffer.pointer[i];  \
                 continue;               \
             }                       \
             if (__items[i].type != ACPI_TYPE_INTEGER) { \
                 ret = -EPROTO;              \
                 break;                  \
             }                       \
             if (__items[i].integer.value > _Generic(__val,  \
                                 u8 *: U8_MAX, \
                                 u16 *: U16_MAX, \
                                 u32 *: U32_MAX, \
                                 u64 *: U64_MAX)) { \
                 ret = -EOVERFLOW;           \
                 break;                  \
             }                       \
                                     \
             __val[i] = __items[i].integer.value;        \
         }                           \
         ret;                            \
     })
 
 static int acpi_copy_property_array_string(const union acpi_object *items,
                        char **val, size_t nval)
 {
     int i;
 
     for (i = 0; i < nval; i++) {
         if (items[i].type != ACPI_TYPE_STRING)
             return -EPROTO;
 
         val[i] = items[i].string.pointer;
     }
     return nval;
 }
 
 static int acpi_data_prop_read(const struct acpi_device_data *data,
                    const char *propname,
                    enum dev_prop_type proptype,
                    void *val, size_t nval)
 {
     const union acpi_object *obj;
     const union acpi_object *items;
     int ret;
 
     if (nval == 1 || !val) {
         ret = acpi_data_prop_read_single(data, propname, proptype, val);
         /*
          * The overflow error means that the property is there and it is
          * single-value, but its type does not match, so return.
          */
         if (ret >= 0 || ret == -EOVERFLOW)
             return ret;
 
         /*
          * Reading this property as a single-value one failed, but its
          * value may still be represented as one-element array, so
          * continue.
          */
     }
 
     ret = acpi_data_get_property_array(data, propname, ACPI_TYPE_ANY, &obj);
     if (ret && proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64)
         ret = acpi_data_get_property(data, propname, ACPI_TYPE_BUFFER,
                          &obj);
     if (ret)
         return ret;
 
     if (!val) {
         if (obj->type == ACPI_TYPE_BUFFER)
             return obj->buffer.length;
 
         return obj->package.count;
     }
 
     switch (proptype) {
     case DEV_PROP_STRING:
         break;
     case DEV_PROP_U8 ... DEV_PROP_U64:
         if (obj->type == ACPI_TYPE_BUFFER) {
             if (nval > obj->buffer.length)
                 return -EOVERFLOW;
             break;
         }
         fallthrough;
     default:
         if (nval > obj->package.count)
             return -EOVERFLOW;
         break;
     }
     if (nval == 0)
         return -EINVAL;
 
     if (obj->type != ACPI_TYPE_BUFFER)
         items = obj->package.elements;
     else
         items = obj;
 
     switch (proptype) {
     case DEV_PROP_U8:
         ret = acpi_copy_property_array_uint(items, (u8 *)val, nval);
         break;
     case DEV_PROP_U16:
         ret = acpi_copy_property_array_uint(items, (u16 *)val, nval);
         break;
     case DEV_PROP_U32:
         ret = acpi_copy_property_array_uint(items, (u32 *)val, nval);
         break;
     case DEV_PROP_U64:
         ret = acpi_copy_property_array_uint(items, (u64 *)val, nval);
         break;
     case DEV_PROP_STRING:
         ret = acpi_copy_property_array_string(
             items, (char **)val,
             min_t(u32, nval, obj->package.count));
         break;
     default:
         ret = -EINVAL;
         break;
     }
     return ret;
 }
 
 /**
  * acpi_node_prop_read - retrieve the value of an ACPI property with given name.
  * @fwnode: Firmware node to get the property from.
  * @propname: Name of the property.
  * @proptype: Expected property type.
  * @val: Location to store the property value (if not %NULL).
  * @nval: Size of the array pointed to by @val.
  *
  * If @val is %NULL, return the number of array elements comprising the value
  * of the property.  Otherwise, read at most @nval values to the array at the
  * location pointed to by @val.
  */
 static int acpi_node_prop_read(const struct fwnode_handle *fwnode,
                    const char *propname, enum dev_prop_type proptype,
                    void *val, size_t nval)
 {
     return acpi_data_prop_read(acpi_device_data_of_node(fwnode),
                    propname, proptype, val, nval);
 }
 
 static int stop_on_next(struct acpi_device *adev, void *data)
 {
     struct acpi_device **ret_p = data;
 
     if (!*ret_p) {
         *ret_p = adev;
         return 1;
     }
 
     /* Skip until the "previous" object is found. */
     if (*ret_p == adev)
         *ret_p = NULL;
 
     return 0;
 }
 
 /**
  * acpi_get_next_subnode - Return the next child node handle for a fwnode
  * @fwnode: Firmware node to find the next child node for.
  * @child: Handle to one of the device's child nodes or a null handle.
  */
 struct fwnode_handle *acpi_get_next_subnode(const struct fwnode_handle *fwnode,
                         struct fwnode_handle *child)
 {
     struct acpi_device *adev = to_acpi_device_node(fwnode);
 
     if ((!child || is_acpi_device_node(child)) && adev) {
         struct acpi_device *child_adev = to_acpi_device_node(child);
 
         acpi_dev_for_each_child(adev, stop_on_next, &child_adev);
         if (child_adev)
             return acpi_fwnode_handle(child_adev);
 
         child = NULL;
     }
 
     if (!child || is_acpi_data_node(child)) {
         const struct acpi_data_node *data = to_acpi_data_node(fwnode);
         const struct list_head *head;
         struct list_head *next;
         struct acpi_data_node *dn;
 
         /*
          * We can have a combination of device and data nodes, e.g. with
          * hierarchical _DSD properties. Make sure the adev pointer is
          * restored before going through data nodes, otherwise we will
          * be looking for data_nodes below the last device found instead
          * of the common fwnode shared by device_nodes and data_nodes.
          */
         adev = to_acpi_device_node(fwnode);
         if (adev)
             head = &adev->data.subnodes;
         else if (data)
             head = &data->data.subnodes;
         else
             return NULL;
 
         if (list_empty(head))
             return NULL;
 
         if (child) {
             dn = to_acpi_data_node(child);
             next = dn->sibling.next;
             if (next == head)
                 return NULL;
 
             dn = list_entry(next, struct acpi_data_node, sibling);
         } else {
             dn = list_first_entry(head, struct acpi_data_node, sibling);
         }
         return &dn->fwnode;
     }
     return NULL;
 }
 
 /**
  * acpi_node_get_parent - Return parent fwnode of this fwnode
  * @fwnode: Firmware node whose parent to get
  *
  * Returns parent node of an ACPI device or data firmware node or %NULL if
  * not available.
  */
 static struct fwnode_handle *
 acpi_node_get_parent(const struct fwnode_handle *fwnode)
 {
     if (is_acpi_data_node(fwnode)) {
         /* All data nodes have parent pointer so just return that */
         return to_acpi_data_node(fwnode)->parent;
     }
     if (is_acpi_device_node(fwnode)) {
         struct device *dev = to_acpi_device_node(fwnode)->dev.parent;
 
         if (dev)
             return acpi_fwnode_handle(to_acpi_device(dev));
     }
 
     return NULL;
 }
 
 /*
  * Return true if the node is an ACPI graph node. Called on either ports
  * or endpoints.
  */
 static bool is_acpi_graph_node(struct fwnode_handle *fwnode,
                    const char *str)
 {
     unsigned int len = strlen(str);
     const char *name;
 
     if (!len || !is_acpi_data_node(fwnode))
         return false;
 
     name = to_acpi_data_node(fwnode)->name;
 
     return (fwnode_property_present(fwnode, "reg") &&
         !strncmp(name, str, len) && name[len] == '@') ||
         fwnode_property_present(fwnode, str);
 }
 
 /**
  * acpi_graph_get_next_endpoint - Get next endpoint ACPI firmware node
  * @fwnode: Pointer to the parent firmware node
  * @prev: Previous endpoint node or %NULL to get the first
  *
  * Looks up next endpoint ACPI firmware node below a given @fwnode. Returns
  * %NULL if there is no next endpoint or in case of error. In case of success
  * the next endpoint is returned.
  */
 static struct fwnode_handle *acpi_graph_get_next_endpoint(
     const struct fwnode_handle *fwnode, struct fwnode_handle *prev)
 {
     struct fwnode_handle *port = NULL;
     struct fwnode_handle *endpoint;
 
     if (!prev) {
         do {
             port = fwnode_get_next_child_node(fwnode, port);
             /*
              * The names of the port nodes begin with "port@"
              * followed by the number of the port node and they also
              * have a "reg" property that also has the number of the
              * port node. For compatibility reasons a node is also
              * recognised as a port node from the "port" property.
              */
             if (is_acpi_graph_node(port, "port"))
                 break;
         } while (port);
     } else {
         port = fwnode_get_parent(prev);
     }
 
     if (!port)
         return NULL;
 
     endpoint = fwnode_get_next_child_node(port, prev);
     while (!endpoint) {
         port = fwnode_get_next_child_node(fwnode, port);
         if (!port)
             break;
         if (is_acpi_graph_node(port, "port"))
             endpoint = fwnode_get_next_child_node(port, NULL);
     }
 
     /*
      * The names of the endpoint nodes begin with "endpoint@" followed by
      * the number of the endpoint node and they also have a "reg" property
      * that also has the number of the endpoint node. For compatibility
      * reasons a node is also recognised as an endpoint node from the
      * "endpoint" property.
      */
     if (!is_acpi_graph_node(endpoint, "endpoint"))
         return NULL;
 
     return endpoint;
 }
 
 /**
  * acpi_graph_get_child_prop_value - Return a child with a given property value
  * @fwnode: device fwnode
  * @prop_name: The name of the property to look for
  * @val: the desired property value
  *
  * Return the port node corresponding to a given port number. Returns
  * the child node on success, NULL otherwise.
  */
 static struct fwnode_handle *acpi_graph_get_child_prop_value(
     const struct fwnode_handle *fwnode, const char *prop_name,
     unsigned int val)
 {
     struct fwnode_handle *child;
 
     fwnode_for_each_child_node(fwnode, child) {
         u32 nr;
 
         if (fwnode_property_read_u32(child, prop_name, &nr))
             continue;
 
         if (val == nr)
             return child;
     }
 
     return NULL;
 }
 
 
 /**
  * acpi_graph_get_remote_endpoint - Parses and returns remote end of an endpoint
  * @__fwnode: Endpoint firmware node pointing to a remote device
  *
  * Returns the remote endpoint corresponding to @__fwnode. NULL on error.
  */
 static struct fwnode_handle *
 acpi_graph_get_remote_endpoint(const struct fwnode_handle *__fwnode)
 {
     struct fwnode_handle *fwnode;
     unsigned int port_nr, endpoint_nr;
     struct fwnode_reference_args args;
     int ret;
 
     memset(&args, 0, sizeof(args));
     ret = acpi_node_get_property_reference(__fwnode, "remote-endpoint", 0,
                            &args);
     if (ret)
         return NULL;
 
     /* Direct endpoint reference? */
     if (!is_acpi_device_node(args.fwnode))
         return args.nargs ? NULL : args.fwnode;
 
     /*
      * Always require two arguments with the reference: port and
      * endpoint indices.
      */
     if (args.nargs != 2)
         return NULL;
 
     fwnode = args.fwnode;
     port_nr = args.args[0];
     endpoint_nr = args.args[1];
 
     fwnode = acpi_graph_get_child_prop_value(fwnode, "port", port_nr);
 
     return acpi_graph_get_child_prop_value(fwnode, "endpoint", endpoint_nr);
 }
 
 static bool acpi_fwnode_device_is_available(const struct fwnode_handle *fwnode)
 {
     if (!is_acpi_device_node(fwnode))
         return false;
 
     return acpi_device_is_present(to_acpi_device_node(fwnode));
 }
 
 static const void *
 acpi_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
                   const struct device *dev)
 {
     return acpi_device_get_match_data(dev);
 }
 
 static bool acpi_fwnode_device_dma_supported(const struct fwnode_handle *fwnode)
 {
     return acpi_dma_supported(to_acpi_device_node(fwnode));
 }
 
 static enum dev_dma_attr
 acpi_fwnode_device_get_dma_attr(const struct fwnode_handle *fwnode)
 {
     return acpi_get_dma_attr(to_acpi_device_node(fwnode));
 }
 
 static bool acpi_fwnode_property_present(const struct fwnode_handle *fwnode,
                      const char *propname)
 {
     return !acpi_node_prop_get(fwnode, propname, NULL);
 }
 
 static int
 acpi_fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
                     const char *propname,
                     unsigned int elem_size, void *val,
                     size_t nval)
 {
     enum dev_prop_type type;
 
     switch (elem_size) {
     case sizeof(u8):
         type = DEV_PROP_U8;
         break;
     case sizeof(u16):
         type = DEV_PROP_U16;
         break;
     case sizeof(u32):
         type = DEV_PROP_U32;
         break;
     case sizeof(u64):
         type = DEV_PROP_U64;
         break;
     default:
         return -ENXIO;
     }
 
     return acpi_node_prop_read(fwnode, propname, type, val, nval);
 }
 
 static int
 acpi_fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
                        const char *propname, const char **val,
                        size_t nval)
 {
     return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING,
                    val, nval);
 }
 
 static int
 acpi_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
                    const char *prop, const char *nargs_prop,
                    unsigned int args_count, unsigned int index,
                    struct fwnode_reference_args *args)
 {
     return __acpi_node_get_property_reference(fwnode, prop, index,
                           args_count, args);
 }
 
 static const char *acpi_fwnode_get_name(const struct fwnode_handle *fwnode)
 {
     const struct acpi_device *adev;
     struct fwnode_handle *parent;
 
     /* Is this the root node? */
     parent = fwnode_get_parent(fwnode);
     if (!parent)
         return "\\";
 
     fwnode_handle_put(parent);
 
     if (is_acpi_data_node(fwnode)) {
         const struct acpi_data_node *dn = to_acpi_data_node(fwnode);
 
         return dn->name;
     }
 
     adev = to_acpi_device_node(fwnode);
     if (WARN_ON(!adev))
         return NULL;
 
     return acpi_device_bid(adev);
 }
 
 static const char *
 acpi_fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
 {
     struct fwnode_handle *parent;
 
     /* Is this the root node? */
     parent = fwnode_get_parent(fwnode);
     if (!parent)
         return "";
 
     /* Is this 2nd node from the root? */
     parent = fwnode_get_next_parent(parent);
     if (!parent)
         return "";
 
     fwnode_handle_put(parent);
 
     /* ACPI device or data node. */
     return ".";
 }
 
 static struct fwnode_handle *
 acpi_fwnode_get_parent(struct fwnode_handle *fwnode)
 {
     return acpi_node_get_parent(fwnode);
 }
 
 static int acpi_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
                         struct fwnode_endpoint *endpoint)
 {
     struct fwnode_handle *port_fwnode = fwnode_get_parent(fwnode);
 
     endpoint->local_fwnode = fwnode;
 
     if (fwnode_property_read_u32(port_fwnode, "reg", &endpoint->port))
         fwnode_property_read_u32(port_fwnode, "port", &endpoint->port);
     if (fwnode_property_read_u32(fwnode, "reg", &endpoint->id))
         fwnode_property_read_u32(fwnode, "endpoint", &endpoint->id);
 
     return 0;
 }
 
 static int acpi_fwnode_irq_get(const struct fwnode_handle *fwnode,
                    unsigned int index)
 {
     struct resource res;
     int ret;
 
     ret = acpi_irq_get(ACPI_HANDLE_FWNODE(fwnode), index, &res);
     if (ret)
         return ret;
 
     return res.start;
 }
 
 #define DECLARE_ACPI_FWNODE_OPS(ops) \
     const struct fwnode_operations ops = {              \
         .device_is_available = acpi_fwnode_device_is_available, \
         .device_get_match_data = acpi_fwnode_device_get_match_data, \
         .device_dma_supported =             \
             acpi_fwnode_device_dma_supported,       \
         .device_get_dma_attr = acpi_fwnode_device_get_dma_attr, \
         .property_present = acpi_fwnode_property_present,   \
         .property_read_int_array =              \
             acpi_fwnode_property_read_int_array,        \
         .property_read_string_array =               \
             acpi_fwnode_property_read_string_array,     \
         .get_parent = acpi_node_get_parent,         \
         .get_next_child_node = acpi_get_next_subnode,       \
         .get_named_child_node = acpi_fwnode_get_named_child_node, \
         .get_name = acpi_fwnode_get_name,           \
         .get_name_prefix = acpi_fwnode_get_name_prefix,     \
         .get_reference_args = acpi_fwnode_get_reference_args,   \
         .graph_get_next_endpoint =              \
             acpi_graph_get_next_endpoint,           \
         .graph_get_remote_endpoint =                \
             acpi_graph_get_remote_endpoint,         \
         .graph_get_port_parent = acpi_fwnode_get_parent,    \
         .graph_parse_endpoint = acpi_fwnode_graph_parse_endpoint, \
         .irq_get = acpi_fwnode_irq_get,             \
     };                              \
     EXPORT_SYMBOL_GPL(ops)
 
 DECLARE_ACPI_FWNODE_OPS(acpi_device_fwnode_ops);
 DECLARE_ACPI_FWNODE_OPS(acpi_data_fwnode_ops);
 const struct fwnode_operations acpi_static_fwnode_ops;
 
 bool is_acpi_device_node(const struct fwnode_handle *fwnode)
 {
     return !IS_ERR_OR_NULL(fwnode) &&
         fwnode->ops == &acpi_device_fwnode_ops;
 }
 EXPORT_SYMBOL(is_acpi_device_node);
 
 bool is_acpi_data_node(const struct fwnode_handle *fwnode)
 {
     return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &acpi_data_fwnode_ops;
 }
 EXPORT_SYMBOL(is_acpi_data_node);

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