1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Clkout driver for Rockchip RK808
4 *
5 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
6 *
7 * Author:Chris Zhong <zyw@rock-chips.com>
8 */
9
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>
16
17struct rk808_clkout {
18	struct rk808 *rk808;
19	struct clk_hw		clkout1_hw;
20	struct clk_hw		clkout2_hw;
21};
22
23static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
24					      unsigned long parent_rate)
25{
26	return 32768;
27}
28
29static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
30{
31	struct rk808_clkout *rk808_clkout = container_of(hw,
32							 struct rk808_clkout,
33							 clkout2_hw);
34	struct rk808 *rk808 = rk808_clkout->rk808;
35
36	return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
37				  CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
38}
39
40static int rk808_clkout2_prepare(struct clk_hw *hw)
41{
42	return rk808_clkout2_enable(hw, true);
43}
44
45static void rk808_clkout2_unprepare(struct clk_hw *hw)
46{
47	rk808_clkout2_enable(hw, false);
48}
49
50static int rk808_clkout2_is_prepared(struct clk_hw *hw)
51{
52	struct rk808_clkout *rk808_clkout = container_of(hw,
53							 struct rk808_clkout,
54							 clkout2_hw);
55	struct rk808 *rk808 = rk808_clkout->rk808;
56	uint32_t val;
57
58	int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
59
60	if (ret < 0)
61		return ret;
62
63	return (val & CLK32KOUT2_EN) ? 1 : 0;
64}
65
66static const struct clk_ops rk808_clkout1_ops = {
67	.recalc_rate = rk808_clkout_recalc_rate,
68};
69
70static 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,
75};
76
77static struct clk_hw *
78of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
79{
80	struct rk808_clkout *rk808_clkout = data;
81	unsigned int idx = clkspec->args[0];
82
83	if (idx >= 2) {
84		pr_err("%s: invalid index %u\n", __func__, idx);
85		return ERR_PTR(-EINVAL);
86	}
87
88	return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
89}
90
91static int rk817_clkout2_enable(struct clk_hw *hw, bool enable)
92{
93	struct rk808_clkout *rk808_clkout = container_of(hw,
94							 struct rk808_clkout,
95							 clkout2_hw);
96	struct rk808 *rk808 = rk808_clkout->rk808;
97
98	return regmap_update_bits(rk808->regmap, RK817_SYS_CFG(1),
99				  RK817_CLK32KOUT2_EN,
100				  enable ? RK817_CLK32KOUT2_EN : 0);
101}
102
103static int rk817_clkout2_prepare(struct clk_hw *hw)
104{
105	return rk817_clkout2_enable(hw, true);
106}
107
108static void rk817_clkout2_unprepare(struct clk_hw *hw)
109{
110	rk817_clkout2_enable(hw, false);
111}
112
113static int rk817_clkout2_is_prepared(struct clk_hw *hw)
114{
115	struct rk808_clkout *rk808_clkout = container_of(hw,
116							 struct rk808_clkout,
117							 clkout2_hw);
118	struct rk808 *rk808 = rk808_clkout->rk808;
119	unsigned int val;
120
121	int ret = regmap_read(rk808->regmap, RK817_SYS_CFG(1), &val);
122
123	if (ret < 0)
124		return 0;
125
126	return (val & RK817_CLK32KOUT2_EN) ? 1 : 0;
127}
128
129static const struct clk_ops rk817_clkout2_ops = {
130	.prepare = rk817_clkout2_prepare,
131	.unprepare = rk817_clkout2_unprepare,
132	.is_prepared = rk817_clkout2_is_prepared,
133	.recalc_rate = rk808_clkout_recalc_rate,
134};
135
136static const struct clk_ops *rkpmic_get_ops(long variant)
137{
138	switch (variant) {
139	case RK809_ID:
140	case RK817_ID:
141		return &rk817_clkout2_ops;
142	/*
143	 * For the default case, it match the following PMIC type.
144	 * RK805_ID
145	 * RK808_ID
146	 * RK818_ID
147	 */
148	default:
149		return &rk808_clkout2_ops;
150	}
151}
152
153static int rk808_clkout_probe(struct platform_device *pdev)
154{
155	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
156	struct i2c_client *client = rk808->i2c;
157	struct device_node *node = client->dev.of_node;
158	struct clk_init_data init = {};
159	struct rk808_clkout *rk808_clkout;
160	int ret;
161
162	rk808_clkout = devm_kzalloc(&client->dev,
163				    sizeof(*rk808_clkout), GFP_KERNEL);
164	if (!rk808_clkout)
165		return -ENOMEM;
166
167	rk808_clkout->rk808 = rk808;
168
169	init.parent_names = NULL;
170	init.num_parents = 0;
171	init.name = "rk808-clkout1";
172	init.ops = &rk808_clkout1_ops;
173	rk808_clkout->clkout1_hw.init = &init;
174
175	/* optional override of the clockname */
176	of_property_read_string_index(node, "clock-output-names",
177				      0, &init.name);
178
179	ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout1_hw);
180	if (ret)
181		return ret;
182
183	init.name = "rk808-clkout2";
184	init.ops = rkpmic_get_ops(rk808->variant);
185	rk808_clkout->clkout2_hw.init = &init;
186
187	/* optional override of the clockname */
188	of_property_read_string_index(node, "clock-output-names",
189				      1, &init.name);
190
191	ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout2_hw);
192	if (ret)
193		return ret;
194
195	return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
196					   rk808_clkout);
197}
198
199static struct platform_driver rk808_clkout_driver = {
200	.probe = rk808_clkout_probe,
201	.driver		= {
202		.name	= "rk808-clkout",
203	},
204};
205
206module_platform_driver(rk808_clkout_driver);
207
208MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
209MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
210MODULE_LICENSE("GPL");
211MODULE_ALIAS("platform:rk808-clkout");
212