0001 What: /sys/bus/platform/devices/.../driver_override
0002 Date: April 2014
0003 Contact: Kim Phillips <kim.phillips@freescale.com>
0004 Description:
0005 This file allows the driver for a device to be specified which
0006 will override standard OF, ACPI, ID table, and name matching.
0007 When specified, only a driver with a name matching the value
0008 written to driver_override will have an opportunity to bind
0009 to the device. The override is specified by writing a string
0010 to the driver_override file (echo vfio-platform > \
0011 driver_override) and may be cleared with an empty string
0012 (echo > driver_override). This returns the device to standard
0013 matching rules binding. Writing to driver_override does not
0014 automatically unbind the device from its current driver or make
0015 any attempt to automatically load the specified driver. If no
0016 driver with a matching name is currently loaded in the kernel,
0017 the device will not bind to any driver. This also allows
0018 devices to opt-out of driver binding using a driver_override
0019 name such as "none". Only a single driver may be specified in
0020 the override, there is no support for parsing delimiters.
0021
0022 What: /sys/bus/platform/devices/.../numa_node
0023 Date: June 2020
0024 Contact: Barry Song <song.bao.hua@hisilicon.com>
0025 Description:
0026 This file contains the NUMA node to which the platform device
0027 is attached. It won't be visible if the node is unknown. The
0028 value comes from an ACPI _PXM method or a similar firmware
0029 source. Initial users for this file would be devices like
0030 arm smmu which are populated by arm64 acpi_iort.
0031
0032 What: /sys/bus/platform/devices/.../msi_irqs/
0033 Date: August 2021
0034 Contact: Barry Song <song.bao.hua@hisilicon.com>
0035 Description:
0036 The /sys/devices/.../msi_irqs directory contains a variable set
0037 of files, with each file being named after a corresponding msi
0038 irq vector allocated to that device.
0039
0040 What: /sys/bus/platform/devices/.../msi_irqs/<N>
0041 Date: August 2021
0042 Contact: Barry Song <song.bao.hua@hisilicon.com>
0043 Description:
0044 This attribute will show "msi" if <N> is a valid msi irq
0045
0046 What: /sys/bus/platform/devices/.../modalias
0047 Description:
0048 Same as MODALIAS in the uevent at device creation.
0049
0050 A platform device that it is exposed via devicetree uses:
0051
0052 - of:N`of node name`T`type`
0053
0054 Other platform devices use, instead:
0055
0056 - platform:`driver name`
