drivers/clk/clk-rk808.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Clkout driver for Rockchip RK808
0004  *
0005  * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
0006  *
0007  * Author:Chris Zhong <zyw@rock-chips.com>
0008  */
0009
0010 #include <linux/clk-provider.h>
0011 #include <linux/module.h>
0012 #include <linux/slab.h>
0013 #include <linux/platform_device.h>
0014 #include <linux/mfd/rk808.h>
0015 #include <linux/i2c.h>
0016
0017 struct rk808_clkout {
0018     struct rk808 *rk808;
0019     struct clk_hw       clkout1_hw;
0020     struct clk_hw       clkout2_hw;
0021 };
0022
0023 static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
0024                           unsigned long parent_rate)
0025 {
0026     return 32768;
0027 }
0028
0029 static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
0030 {
0031     struct rk808_clkout *rk808_clkout = container_of(hw,
0032                              struct rk808_clkout,
0033                              clkout2_hw);
0034     struct rk808 *rk808 = rk808_clkout->rk808;
0035
0036     return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
0037                   CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
0038 }
0039
0040 static int rk808_clkout2_prepare(struct clk_hw *hw)
0041 {
0042     return rk808_clkout2_enable(hw, true);
0043 }
0044
0045 static void rk808_clkout2_unprepare(struct clk_hw *hw)
0046 {
0047     rk808_clkout2_enable(hw, false);
0048 }
0049
0050 static int rk808_clkout2_is_prepared(struct clk_hw *hw)
0051 {
0052     struct rk808_clkout *rk808_clkout = container_of(hw,
0053                              struct rk808_clkout,
0054                              clkout2_hw);
0055     struct rk808 *rk808 = rk808_clkout->rk808;
0056     uint32_t val;
0057
0058     int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
0059
0060     if (ret < 0)
0061         return ret;
0062
0063     return (val & CLK32KOUT2_EN) ? 1 : 0;
0064 }
0065
0066 static const struct clk_ops rk808_clkout1_ops = {
0067     .recalc_rate = rk808_clkout_recalc_rate,
0068 };
0069
0070 static const struct clk_ops rk808_clkout2_ops = {
0071     .prepare = rk808_clkout2_prepare,
0072     .unprepare = rk808_clkout2_unprepare,
0073     .is_prepared = rk808_clkout2_is_prepared,
0074     .recalc_rate = rk808_clkout_recalc_rate,
0075 };
0076
0077 static struct clk_hw *
0078 of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
0079 {
0080     struct rk808_clkout *rk808_clkout = data;
0081     unsigned int idx = clkspec->args[0];
0082
0083     if (idx >= 2) {
0084         pr_err("%s: invalid index %u\n", __func__, idx);
0085         return ERR_PTR(-EINVAL);
0086     }
0087
0088     return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
0089 }
0090
0091 static int rk817_clkout2_enable(struct clk_hw *hw, bool enable)
0092 {
0093     struct rk808_clkout *rk808_clkout = container_of(hw,
0094                              struct rk808_clkout,
0095                              clkout2_hw);
0096     struct rk808 *rk808 = rk808_clkout->rk808;
0097
0098     return regmap_update_bits(rk808->regmap, RK817_SYS_CFG(1),
0099                   RK817_CLK32KOUT2_EN,
0100                   enable ? RK817_CLK32KOUT2_EN : 0);
0101 }
0102
0103 static int rk817_clkout2_prepare(struct clk_hw *hw)
0104 {
0105     return rk817_clkout2_enable(hw, true);
0106 }
0107
0108 static void rk817_clkout2_unprepare(struct clk_hw *hw)
0109 {
0110     rk817_clkout2_enable(hw, false);
0111 }
0112
0113 static int rk817_clkout2_is_prepared(struct clk_hw *hw)
0114 {
0115     struct rk808_clkout *rk808_clkout = container_of(hw,
0116                              struct rk808_clkout,
0117                              clkout2_hw);
0118     struct rk808 *rk808 = rk808_clkout->rk808;
0119     unsigned int val;
0120
0121     int ret = regmap_read(rk808->regmap, RK817_SYS_CFG(1), &val);
0122
0123     if (ret < 0)
0124         return 0;
0125
0126     return (val & RK817_CLK32KOUT2_EN) ? 1 : 0;
0127 }
0128
0129 static const struct clk_ops rk817_clkout2_ops = {
0130     .prepare = rk817_clkout2_prepare,
0131     .unprepare = rk817_clkout2_unprepare,
0132     .is_prepared = rk817_clkout2_is_prepared,
0133     .recalc_rate = rk808_clkout_recalc_rate,
0134 };
0135
0136 static const struct clk_ops *rkpmic_get_ops(long variant)
0137 {
0138     switch (variant) {
0139     case RK809_ID:
0140     case RK817_ID:
0141         return &rk817_clkout2_ops;
0142     /*
0143      * For the default case, it match the following PMIC type.
0144      * RK805_ID
0145      * RK808_ID
0146      * RK818_ID
0147      */
0148     default:
0149         return &rk808_clkout2_ops;
0150     }
0151 }
0152
0153 static int rk808_clkout_probe(struct platform_device *pdev)
0154 {
0155     struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
0156     struct i2c_client *client = rk808->i2c;
0157     struct device_node *node = client->dev.of_node;
0158     struct clk_init_data init = {};
0159     struct rk808_clkout *rk808_clkout;
0160     int ret;
0161
0162     rk808_clkout = devm_kzalloc(&client->dev,
0163                     sizeof(*rk808_clkout), GFP_KERNEL);
0164     if (!rk808_clkout)
0165         return -ENOMEM;
0166
0167     rk808_clkout->rk808 = rk808;
0168
0169     init.parent_names = NULL;
0170     init.num_parents = 0;
0171     init.name = "rk808-clkout1";
0172     init.ops = &rk808_clkout1_ops;
0173     rk808_clkout->clkout1_hw.init = &init;
0174
0175     /* optional override of the clockname */
0176     of_property_read_string_index(node, "clock-output-names",
0177                       0, &init.name);
0178
0179     ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout1_hw);
0180     if (ret)
0181         return ret;
0182
0183     init.name = "rk808-clkout2";
0184     init.ops = rkpmic_get_ops(rk808->variant);
0185     rk808_clkout->clkout2_hw.init = &init;
0186
0187     /* optional override of the clockname */
0188     of_property_read_string_index(node, "clock-output-names",
0189                       1, &init.name);
0190
0191     ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout2_hw);
0192     if (ret)
0193         return ret;
0194
0195     return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
0196                        rk808_clkout);
0197 }
0198
0199 static struct platform_driver rk808_clkout_driver = {
0200     .probe = rk808_clkout_probe,
0201     .driver     = {
0202         .name   = "rk808-clkout",
0203     },
0204 };
0205
0206 module_platform_driver(rk808_clkout_driver);
0207
0208 MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
0209 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
0210 MODULE_LICENSE("GPL");
0211 MODULE_ALIAS("platform:rk808-clkout");