[linux.git] / drivers / clk / clk-hi655x.c

/*
 * Clock driver for Hi655x
 *
 * Copyright (c) 2017, Linaro Ltd.
 *
 * Author: Daniel Lezcano <[email protected]>
 *
 * 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/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/mfd/core.h>
#include <linux/mfd/hi655x-pmic.h>

#define HI655X_CLK_BASE	HI655X_BUS_ADDR(0x1c)
#define HI655X_CLK_SET	BIT(6)

struct hi655x_clk {
	struct hi655x_pmic *hi655x;
	struct clk_hw       clk_hw;
};

static unsigned long hi655x_clk_recalc_rate(struct clk_hw *hw,
					    unsigned long parent_rate)
{
	return 32768;
}

static int hi655x_clk_enable(struct clk_hw *hw, bool enable)
{
	struct hi655x_clk *hi655x_clk =
		container_of(hw, struct hi655x_clk, clk_hw);

	struct hi655x_pmic *hi655x = hi655x_clk->hi655x;

	return regmap_update_bits(hi655x->regmap, HI655X_CLK_BASE,
				  HI655X_CLK_SET, enable ? HI655X_CLK_SET : 0);
}

static int hi655x_clk_prepare(struct clk_hw *hw)
{
	return hi655x_clk_enable(hw, true);
}

static void hi655x_clk_unprepare(struct clk_hw *hw)
{
	hi655x_clk_enable(hw, false);
}

static int hi655x_clk_is_prepared(struct clk_hw *hw)
{
	struct hi655x_clk *hi655x_clk =
		container_of(hw, struct hi655x_clk, clk_hw);
	struct hi655x_pmic *hi655x = hi655x_clk->hi655x;
	int ret;
	uint32_t val;

	ret = regmap_read(hi655x->regmap, HI655X_CLK_BASE, &val);
	if (ret < 0)
		return ret;

	return val & HI655X_CLK_BASE;
}

static const struct clk_ops hi655x_clk_ops = {
	.prepare     = hi655x_clk_prepare,
	.unprepare   = hi655x_clk_unprepare,
	.is_prepared = hi655x_clk_is_prepared,
	.recalc_rate = hi655x_clk_recalc_rate,
};

static int hi655x_clk_probe(struct platform_device *pdev)
{
	struct device *parent = pdev->dev.parent;
	struct hi655x_pmic *hi655x = dev_get_drvdata(parent);
	struct hi655x_clk *hi655x_clk;
	const char *clk_name = "hi655x-clk";
	struct clk_init_data init = {
		.name = clk_name,
		.ops = &hi655x_clk_ops
	};
	int ret;

	hi655x_clk = devm_kzalloc(&pdev->dev, sizeof(*hi655x_clk), GFP_KERNEL);
	if (!hi655x_clk)
		return -ENOMEM;

	of_property_read_string_index(parent->of_node, "clock-output-names",
				      0, &clk_name);

	hi655x_clk->clk_hw.init	= &init;
	hi655x_clk->hi655x	= hi655x;

	platform_set_drvdata(pdev, hi655x_clk);

	ret = devm_clk_hw_register(&pdev->dev, &hi655x_clk->clk_hw);
	if (ret)
		return ret;

	return of_clk_add_hw_provider(parent->of_node, of_clk_hw_simple_get,
				     &hi655x_clk->clk_hw);
}

static struct platform_driver hi655x_clk_driver = {
	.probe =  hi655x_clk_probe,
	.driver		= {
		.name	= "hi655x-clk",
	},
};

module_platform_driver(hi655x_clk_driver);

MODULE_DESCRIPTION("Clk driver for the hi655x series PMICs");
MODULE_AUTHOR("Daniel Lezcano <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:hi655x-clk");
Commit	Line	Data
b68adc23 DL	1	/*
	2	* Clock driver for Hi655x
	3	*
	4	* Copyright (c) 2017, Linaro Ltd.
	5	*
	6	* Author: Daniel Lezcano <[email protected]>
	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	#include <linux/clk-provider.h>
	18	#include <linux/module.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/regmap.h>
	21	#include <linux/slab.h>
	22	#include <linux/mfd/core.h>
	23	#include <linux/mfd/hi655x-pmic.h>
	24
	25	#define HI655X_CLK_BASE HI655X_BUS_ADDR(0x1c)
	26	#define HI655X_CLK_SET BIT(6)
	27
	28	struct hi655x_clk {
	29	struct hi655x_pmic *hi655x;
	30	struct clk_hw clk_hw;
	31	};
	32
	33	static unsigned long hi655x_clk_recalc_rate(struct clk_hw *hw,
	34	unsigned long parent_rate)
	35	{
	36	return 32768;
	37	}
	38
	39	static int hi655x_clk_enable(struct clk_hw *hw, bool enable)
	40	{
	41	struct hi655x_clk *hi655x_clk =
	42	container_of(hw, struct hi655x_clk, clk_hw);
	43
	44	struct hi655x_pmic *hi655x = hi655x_clk->hi655x;
	45
	46	return regmap_update_bits(hi655x->regmap, HI655X_CLK_BASE,
	47	HI655X_CLK_SET, enable ? HI655X_CLK_SET : 0);
	48	}
	49
	50	static int hi655x_clk_prepare(struct clk_hw *hw)
	51	{
	52	return hi655x_clk_enable(hw, true);
	53	}
	54
	55	static void hi655x_clk_unprepare(struct clk_hw *hw)
	56	{
	57	hi655x_clk_enable(hw, false);
	58	}
	59
	60	static int hi655x_clk_is_prepared(struct clk_hw *hw)
	61	{
	62	struct hi655x_clk *hi655x_clk =
	63	container_of(hw, struct hi655x_clk, clk_hw);
	64	struct hi655x_pmic *hi655x = hi655x_clk->hi655x;
65	int ret;
66	uint32_t val;
67
68	ret = regmap_read(hi655x->regmap, HI655X_CLK_BASE, &val);
69	if (ret < 0)
70	return ret;
71
72	return val & HI655X_CLK_BASE;
73	}
74
75	static const struct clk_ops hi655x_clk_ops = {
76	.prepare = hi655x_clk_prepare,
77	.unprepare = hi655x_clk_unprepare,
78	.is_prepared = hi655x_clk_is_prepared,
79	.recalc_rate = hi655x_clk_recalc_rate,
80	};
81
82	static int hi655x_clk_probe(struct platform_device *pdev)
83	{
84	struct device *parent = pdev->dev.parent;
85	struct hi655x_pmic *hi655x = dev_get_drvdata(parent);
86	struct hi655x_clk *hi655x_clk;
87	const char *clk_name = "hi655x-clk";
88	struct clk_init_data init = {
89	.name = clk_name,
90	.ops = &hi655x_clk_ops
91	};
92	int ret;
93
94	hi655x_clk = devm_kzalloc(&pdev->dev, sizeof(*hi655x_clk), GFP_KERNEL);
95	if (!hi655x_clk)
96	return -ENOMEM;
97
98	of_property_read_string_index(parent->of_node, "clock-output-names",
99	0, &clk_name);
100
101	hi655x_clk->clk_hw.init = &init;
102	hi655x_clk->hi655x = hi655x;
103
104	platform_set_drvdata(pdev, hi655x_clk);
105
106	ret = devm_clk_hw_register(&pdev->dev, &hi655x_clk->clk_hw);
107	if (ret)
108	return ret;
109
110	return of_clk_add_hw_provider(parent->of_node, of_clk_hw_simple_get,
111	&hi655x_clk->clk_hw);
112	}
113
114	static struct platform_driver hi655x_clk_driver = {
115	.probe = hi655x_clk_probe,
116	.driver = {
117	.name = "hi655x-clk",
118	},
119	};
120
121	module_platform_driver(hi655x_clk_driver);
122
123	MODULE_DESCRIPTION("Clk driver for the hi655x series PMICs");
124	MODULE_AUTHOR("Daniel Lezcano <[email protected]>");
125	MODULE_LICENSE("GPL");
126	MODULE_ALIAS("platform:hi655x-clk");