1 // SPDX-License-Identifier: GPL-2.0-only
3 * Clkout driver for Rockchip RK808
5 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
7 * Author:Chris Zhong <zyw@rock-chips.com>
10 #include <linux/clk-provider.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/platform_device.h>
14 #include <linux/mfd/rk808.h>
15 #include <linux/i2c.h>
19 struct clk_hw clkout1_hw;
20 struct clk_hw clkout2_hw;
23 static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
24 unsigned long parent_rate)
29 static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
31 struct rk808_clkout *rk808_clkout = container_of(hw,
34 struct rk808 *rk808 = rk808_clkout->rk808;
36 return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
37 CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
40 static int rk808_clkout2_prepare(struct clk_hw *hw)
42 return rk808_clkout2_enable(hw, true);
45 static void rk808_clkout2_unprepare(struct clk_hw *hw)
47 rk808_clkout2_enable(hw, false);
50 static int rk808_clkout2_is_prepared(struct clk_hw *hw)
52 struct rk808_clkout *rk808_clkout = container_of(hw,
55 struct rk808 *rk808 = rk808_clkout->rk808;
58 int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
63 return (val & CLK32KOUT2_EN) ? 1 : 0;
66 static const struct clk_ops rk808_clkout1_ops = {
67 .recalc_rate = rk808_clkout_recalc_rate,
70 static const struct clk_ops rk808_clkout2_ops = {
71 .prepare = rk808_clkout2_prepare,
72 .unprepare = rk808_clkout2_unprepare,
73 .is_prepared = rk808_clkout2_is_prepared,
74 .recalc_rate = rk808_clkout_recalc_rate,
77 static struct clk_hw *
78 of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
80 struct rk808_clkout *rk808_clkout = data;
81 unsigned int idx = clkspec->args[0];
84 pr_err("%s: invalid index %u\n", __func__, idx);
85 return ERR_PTR(-EINVAL);
88 return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
91 static int rk808_clkout_probe(struct platform_device *pdev)
93 struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
94 struct i2c_client *client = rk808->i2c;
95 struct device_node *node = client->dev.of_node;
96 struct clk_init_data init = {};
97 struct rk808_clkout *rk808_clkout;
100 rk808_clkout = devm_kzalloc(&client->dev,
101 sizeof(*rk808_clkout), GFP_KERNEL);
105 rk808_clkout->rk808 = rk808;
107 init.parent_names = NULL;
108 init.num_parents = 0;
109 init.name = "rk808-clkout1";
110 init.ops = &rk808_clkout1_ops;
111 rk808_clkout->clkout1_hw.init = &init;
113 /* optional override of the clockname */
114 of_property_read_string_index(node, "clock-output-names",
117 ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout1_hw);
121 init.name = "rk808-clkout2";
122 init.ops = &rk808_clkout2_ops;
123 rk808_clkout->clkout2_hw.init = &init;
125 /* optional override of the clockname */
126 of_property_read_string_index(node, "clock-output-names",
129 ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout2_hw);
133 return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
137 static struct platform_driver rk808_clkout_driver = {
138 .probe = rk808_clkout_probe,
140 .name = "rk808-clkout",
144 module_platform_driver(rk808_clkout_driver);
146 MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
147 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
148 MODULE_LICENSE("GPL");
149 MODULE_ALIAS("platform:rk808-clkout");