[mirror_ubuntu-bionic-kernel.git] / drivers / clk / clk-rk808.c

/*
 * Clkout driver for Rockchip RK808
 *
 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
 *
 * Author:Chris Zhong <zyw@rock-chips.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/mfd/rk808.h>
#include <linux/i2c.h>

#define RK808_NR_OUTPUT 2

struct rk808_clkout {
	struct rk808 *rk808;
	struct clk_onecell_data clk_data;
	struct clk_hw		clkout1_hw;
	struct clk_hw		clkout2_hw;
};

static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
					      unsigned long parent_rate)
{
	return 32768;
}

static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
{
	struct rk808_clkout *rk808_clkout = container_of(hw,
							 struct rk808_clkout,
							 clkout2_hw);
	struct rk808 *rk808 = rk808_clkout->rk808;

	return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
				  CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
}

static int rk808_clkout2_prepare(struct clk_hw *hw)
{
	return rk808_clkout2_enable(hw, true);
}

static void rk808_clkout2_unprepare(struct clk_hw *hw)
{
	rk808_clkout2_enable(hw, false);
}

static int rk808_clkout2_is_prepared(struct clk_hw *hw)
{
	struct rk808_clkout *rk808_clkout = container_of(hw,
							 struct rk808_clkout,
							 clkout2_hw);
	struct rk808 *rk808 = rk808_clkout->rk808;
	uint32_t val;

	int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);

	if (ret < 0)
		return ret;

	return (val & CLK32KOUT2_EN) ? 1 : 0;
}

static const struct clk_ops rk808_clkout1_ops = {
	.recalc_rate = rk808_clkout_recalc_rate,
};

static const struct clk_ops rk808_clkout2_ops = {
	.prepare = rk808_clkout2_prepare,
	.unprepare = rk808_clkout2_unprepare,
	.is_prepared = rk808_clkout2_is_prepared,
	.recalc_rate = rk808_clkout_recalc_rate,
};

static int rk808_clkout_probe(struct platform_device *pdev)
{
	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
	struct i2c_client *client = rk808->i2c;
	struct device_node *node = client->dev.of_node;
	struct clk_init_data init = {};
	struct clk **clk_table;
	struct rk808_clkout *rk808_clkout;

	rk808_clkout = devm_kzalloc(&client->dev,
				    sizeof(*rk808_clkout), GFP_KERNEL);
	if (!rk808_clkout)
		return -ENOMEM;

	rk808_clkout->rk808 = rk808;

	clk_table = devm_kcalloc(&client->dev, RK808_NR_OUTPUT,
				 sizeof(struct clk *), GFP_KERNEL);
	if (!clk_table)
		return -ENOMEM;

	init.parent_names = NULL;
	init.num_parents = 0;
	init.name = "rk808-clkout1";
	init.ops = &rk808_clkout1_ops;
	rk808_clkout->clkout1_hw.init = &init;

	/* optional override of the clockname */
	of_property_read_string_index(node, "clock-output-names",
				      0, &init.name);

	clk_table[0] = devm_clk_register(&client->dev,
					 &rk808_clkout->clkout1_hw);
	if (IS_ERR(clk_table[0]))
		return PTR_ERR(clk_table[0]);

	init.name = "rk808-clkout2";
	init.ops = &rk808_clkout2_ops;
	rk808_clkout->clkout2_hw.init = &init;

	/* optional override of the clockname */
	of_property_read_string_index(node, "clock-output-names",
				      1, &init.name);

	clk_table[1] = devm_clk_register(&client->dev,
					 &rk808_clkout->clkout2_hw);
	if (IS_ERR(clk_table[1]))
		return PTR_ERR(clk_table[1]);

	rk808_clkout->clk_data.clks = clk_table;
	rk808_clkout->clk_data.clk_num = RK808_NR_OUTPUT;

	return of_clk_add_provider(node, of_clk_src_onecell_get,
				   &rk808_clkout->clk_data);
}

static int rk808_clkout_remove(struct platform_device *pdev)
{
	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
	struct i2c_client *client = rk808->i2c;
	struct device_node *node = client->dev.of_node;

	of_clk_del_provider(node);

	return 0;
}

static struct platform_driver rk808_clkout_driver = {
	.probe = rk808_clkout_probe,
	.remove = rk808_clkout_remove,
	.driver		= {
		.name	= "rk808-clkout",
	},
};

module_platform_driver(rk808_clkout_driver);

MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rk808-clkout");
Commit	Line	Data
038b892a CZ	1	/*
	2	* Clkout driver for Rockchip RK808
	3	*
	4	* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
	5	*
	6	* Author:Chris Zhong <zyw@rock-chips.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms and conditions of the GNU General Public License,
	10	* version 2, as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope it will be useful, but WITHOUT
	13	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	14	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	15	* more details.
	16	*/
	17
038b892a CZ	18	#include <linux/clk-provider.h>
	19	#include <linux/module.h>
	20	#include <linux/slab.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/mfd/rk808.h>
	23	#include <linux/i2c.h>
	24
	25	#define RK808_NR_OUTPUT 2
	26
	27	struct rk808_clkout {
	28	struct rk808 *rk808;
	29	struct clk_onecell_data clk_data;
	30	struct clk_hw clkout1_hw;
	31	struct clk_hw clkout2_hw;
	32	};
	33
	34	static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
	35	unsigned long parent_rate)
	36	{
	37	return 32768;
	38	}
	39
	40	static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
	41	{
	42	struct rk808_clkout *rk808_clkout = container_of(hw,
	43	struct rk808_clkout,
	44	clkout2_hw);
	45	struct rk808 *rk808 = rk808_clkout->rk808;
	46
	47	return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
	48	CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
	49	}
	50
	51	static int rk808_clkout2_prepare(struct clk_hw *hw)
	52	{
	53	return rk808_clkout2_enable(hw, true);
	54	}
	55
	56	static void rk808_clkout2_unprepare(struct clk_hw *hw)
	57	{
	58	rk808_clkout2_enable(hw, false);
	59	}
	60
	61	static int rk808_clkout2_is_prepared(struct clk_hw *hw)
	62	{
	63	struct rk808_clkout *rk808_clkout = container_of(hw,
	64	struct rk808_clkout,
	65	clkout2_hw);
	66	struct rk808 *rk808 = rk808_clkout->rk808;
	67	uint32_t val;
	68
	69	int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
	70
	71	if (ret < 0)
	72	return ret;
	73
	74	return (val & CLK32KOUT2_EN) ? 1 : 0;
	75	}
	76
	77	static const struct clk_ops rk808_clkout1_ops = {
	78	.recalc_rate = rk808_clkout_recalc_rate,
	79	};
	80
	81	static const struct clk_ops rk808_clkout2_ops = {
82	.prepare = rk808_clkout2_prepare,
83	.unprepare = rk808_clkout2_unprepare,
84	.is_prepared = rk808_clkout2_is_prepared,
85	.recalc_rate = rk808_clkout_recalc_rate,
86	};
87
88	static int rk808_clkout_probe(struct platform_device *pdev)
89	{
90	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
91	struct i2c_client *client = rk808->i2c;
92	struct device_node *node = client->dev.of_node;
93	struct clk_init_data init = {};
94	struct clk **clk_table;
95	struct rk808_clkout *rk808_clkout;
96
97	rk808_clkout = devm_kzalloc(&client->dev,
98	sizeof(*rk808_clkout), GFP_KERNEL);
99	if (!rk808_clkout)
100	return -ENOMEM;
101
102	rk808_clkout->rk808 = rk808;
103
104	clk_table = devm_kcalloc(&client->dev, RK808_NR_OUTPUT,
105	sizeof(struct clk *), GFP_KERNEL);
106	if (!clk_table)
107	return -ENOMEM;
108
038b892a CZ	109	init.parent_names = NULL;
	110	init.num_parents = 0;
	111	init.name = "rk808-clkout1";
	112	init.ops = &rk808_clkout1_ops;
	113	rk808_clkout->clkout1_hw.init = &init;
	114
	115	/* optional override of the clockname */
	116	of_property_read_string_index(node, "clock-output-names",
	117	0, &init.name);
	118
	119	clk_table[0] = devm_clk_register(&client->dev,
	120	&rk808_clkout->clkout1_hw);
	121	if (IS_ERR(clk_table[0]))
	122	return PTR_ERR(clk_table[0]);
	123
	124	init.name = "rk808-clkout2";
	125	init.ops = &rk808_clkout2_ops;
	126	rk808_clkout->clkout2_hw.init = &init;
	127
	128	/* optional override of the clockname */
	129	of_property_read_string_index(node, "clock-output-names",
	130	1, &init.name);
	131
	132	clk_table[1] = devm_clk_register(&client->dev,
	133	&rk808_clkout->clkout2_hw);
	134	if (IS_ERR(clk_table[1]))
	135	return PTR_ERR(clk_table[1]);
	136
	137	rk808_clkout->clk_data.clks = clk_table;
	138	rk808_clkout->clk_data.clk_num = RK808_NR_OUTPUT;
	139
	140	return of_clk_add_provider(node, of_clk_src_onecell_get,
	141	&rk808_clkout->clk_data);
	142	}
	143
	144	static int rk808_clkout_remove(struct platform_device *pdev)
	145	{
	146	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
	147	struct i2c_client *client = rk808->i2c;
	148	struct device_node *node = client->dev.of_node;
	149
	150	of_clk_del_provider(node);
	151
	152	return 0;
	153	}
	154
	155	static struct platform_driver rk808_clkout_driver = {
	156	.probe = rk808_clkout_probe,
	157	.remove = rk808_clkout_remove,
	158	.driver = {
	159	.name = "rk808-clkout",
	160	},
	161	};
	162
	163	module_platform_driver(rk808_clkout_driver);
	164
	165	MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
	166	MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
	167	MODULE_LICENSE("GPL");
	168	MODULE_ALIAS("platform:rk808-clkout");