[mirror_ubuntu-artful-kernel.git] / drivers / clk / clk-max77802.c

/*
 * clk-max77802.c - Clock driver for Maxim 77802
 *
 * Copyright (C) 2014 Google, Inc
 *
 * Copyright (C) 2012 Samsung Electornics
 * Jonghwa Lee <jonghwa3.lee@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that 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.
 *
 * This driver is based on clk-max77686.c
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/mfd/max77686-private.h>
#include <linux/clk-provider.h>
#include <linux/mutex.h>
#include <linux/clkdev.h>

#include <dt-bindings/clock/maxim,max77802.h>
#include "clk-max-gen.h"

#define MAX77802_CLOCK_OPMODE_MASK	0x1
#define MAX77802_CLOCK_LOW_JITTER_SHIFT 0x3

static struct clk_init_data max77802_clks_init[MAX77802_CLKS_NUM] = {
	[MAX77802_CLK_32K_AP] = {
		.name = "32khz_ap",
		.ops = &max_gen_clk_ops,
		.flags = CLK_IS_ROOT,
	},
	[MAX77802_CLK_32K_CP] = {
		.name = "32khz_cp",
		.ops = &max_gen_clk_ops,
		.flags = CLK_IS_ROOT,
	},
};

static int max77802_clk_probe(struct platform_device *pdev)
{
	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	int ret;

	ret = max_gen_clk_probe(pdev, iodev->regmap, MAX77802_REG_32KHZ,
				max77802_clks_init, MAX77802_CLKS_NUM);

	if (ret) {
		dev_err(&pdev->dev, "generic probe failed %d\n", ret);
		return ret;
	}

	/* Enable low-jitter mode on the 32khz clocks. */
	ret = regmap_update_bits(iodev->regmap, MAX77802_REG_32KHZ,
				 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT,
				 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT);
	if (ret < 0)
		dev_err(&pdev->dev, "failed to enable low-jitter mode\n");

	return ret;
}

static int max77802_clk_remove(struct platform_device *pdev)
{
	return max_gen_clk_remove(pdev, MAX77802_CLKS_NUM);
}

static const struct platform_device_id max77802_clk_id[] = {
	{ "max77802-clk", 0},
	{ },
};
MODULE_DEVICE_TABLE(platform, max77802_clk_id);

static struct platform_driver max77802_clk_driver = {
	.driver = {
		.name  = "max77802-clk",
	},
	.probe = max77802_clk_probe,
	.remove = max77802_clk_remove,
	.id_table = max77802_clk_id,
};

module_platform_driver(max77802_clk_driver);

MODULE_DESCRIPTION("MAXIM 77802 Clock Driver");
MODULE_AUTHOR("Javier Martinez Canillas <javier.martinez@collabora.co.uk>");
MODULE_LICENSE("GPL");
Commit	Line	Data
83ccf16c JMC	1	/*
	2	* clk-max77802.c - Clock driver for Maxim 77802
	3	*
	4	* Copyright (C) 2014 Google, Inc
	5	*
	6	* Copyright (C) 2012 Samsung Electornics
	7	* Jonghwa Lee <jonghwa3.lee@samsung.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* This driver is based on clk-max77686.c
	20	*/
	21
	22	#include <linux/kernel.h>
	23	#include <linux/slab.h>
	24	#include <linux/err.h>
	25	#include <linux/platform_device.h>
	26	#include <linux/mfd/max77686-private.h>
	27	#include <linux/clk-provider.h>
	28	#include <linux/mutex.h>
	29	#include <linux/clkdev.h>
	30
	31	#include <dt-bindings/clock/maxim,max77802.h>
	32	#include "clk-max-gen.h"
	33
	34	#define MAX77802_CLOCK_OPMODE_MASK 0x1
	35	#define MAX77802_CLOCK_LOW_JITTER_SHIFT 0x3
	36
	37	static struct clk_init_data max77802_clks_init[MAX77802_CLKS_NUM] = {
	38	[MAX77802_CLK_32K_AP] = {
	39	.name = "32khz_ap",
	40	.ops = &max_gen_clk_ops,
	41	.flags = CLK_IS_ROOT,
	42	},
	43	[MAX77802_CLK_32K_CP] = {
	44	.name = "32khz_cp",
	45	.ops = &max_gen_clk_ops,
	46	.flags = CLK_IS_ROOT,
	47	},
	48	};
	49
	50	static int max77802_clk_probe(struct platform_device *pdev)
	51	{
	52	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	53	int ret;
	54
	55	ret = max_gen_clk_probe(pdev, iodev->regmap, MAX77802_REG_32KHZ,
	56	max77802_clks_init, MAX77802_CLKS_NUM);
	57
	58	if (ret) {
	59	dev_err(&pdev->dev, "generic probe failed %d\n", ret);
	60	return ret;
	61	}
	62
	63	/* Enable low-jitter mode on the 32khz clocks. */
	64	ret = regmap_update_bits(iodev->regmap, MAX77802_REG_32KHZ,
65	1 << MAX77802_CLOCK_LOW_JITTER_SHIFT,
66	1 << MAX77802_CLOCK_LOW_JITTER_SHIFT);
67	if (ret < 0)
68	dev_err(&pdev->dev, "failed to enable low-jitter mode\n");
69
70	return ret;
71	}
72
73	static int max77802_clk_remove(struct platform_device *pdev)
74	{
75	return max_gen_clk_remove(pdev, MAX77802_CLKS_NUM);
76	}
77
78	static const struct platform_device_id max77802_clk_id[] = {
79	{ "max77802-clk", 0},
80	{ },
81	};
82	MODULE_DEVICE_TABLE(platform, max77802_clk_id);
83
84	static struct platform_driver max77802_clk_driver = {
85	.driver = {
86	.name = "max77802-clk",
83ccf16c JMC	87	},
	88	.probe = max77802_clk_probe,
	89	.remove = max77802_clk_remove,
	90	.id_table = max77802_clk_id,
	91	};
	92
	93	module_platform_driver(max77802_clk_driver);
	94
	95	MODULE_DESCRIPTION("MAXIM 77802 Clock Driver");
	96	MODULE_AUTHOR("Javier Martinez Canillas <javier.martinez@collabora.co.uk>");
	97	MODULE_LICENSE("GPL");