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/module.h>
26#include <linux/platform_device.h>
27#include <linux/mfd/max77686-private.h>
28#include <linux/clk-provider.h>
29#include <linux/mutex.h>
30#include <linux/clkdev.h>
31
32#include <dt-bindings/clock/maxim,max77802.h>
33#include "clk-max-gen.h"
34
35#define MAX77802_CLOCK_OPMODE_MASK	0x1
36#define MAX77802_CLOCK_LOW_JITTER_SHIFT 0x3
37
38static struct clk_init_data max77802_clks_init[MAX77802_CLKS_NUM] = {
39	[MAX77802_CLK_32K_AP] = {
40		.name = "32khz_ap",
41		.ops = &max_gen_clk_ops,
42	},
43	[MAX77802_CLK_32K_CP] = {
44		.name = "32khz_cp",
45		.ops = &max_gen_clk_ops,
46	},
47};
48
49static int max77802_clk_probe(struct platform_device *pdev)
50{
51	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
52	int ret;
53
54	ret = max_gen_clk_probe(pdev, iodev->regmap, MAX77802_REG_32KHZ,
55				max77802_clks_init, MAX77802_CLKS_NUM);
56
57	if (ret) {
58		dev_err(&pdev->dev, "generic probe failed %d\n", ret);
59		return ret;
60	}
61
62	/* Enable low-jitter mode on the 32khz clocks. */
63	ret = regmap_update_bits(iodev->regmap, MAX77802_REG_32KHZ,
64				 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT,
65				 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT);
66	if (ret < 0)
67		dev_err(&pdev->dev, "failed to enable low-jitter mode\n");
68
69	return ret;
70}
71
72static int max77802_clk_remove(struct platform_device *pdev)
73{
74	return max_gen_clk_remove(pdev, MAX77802_CLKS_NUM);
75}
76
77static const struct platform_device_id max77802_clk_id[] = {
78	{ "max77802-clk", 0},
79	{ },
80};
81MODULE_DEVICE_TABLE(platform, max77802_clk_id);
82
83static struct platform_driver max77802_clk_driver = {
84	.driver = {
85		.name  = "max77802-clk",
86	},
87	.probe = max77802_clk_probe,
88	.remove = max77802_clk_remove,
89	.id_table = max77802_clk_id,
90};
91
92module_platform_driver(max77802_clk_driver);
93
94MODULE_DESCRIPTION("MAXIM 77802 Clock Driver");
95MODULE_AUTHOR("Javier Martinez Canillas <javier@osg.samsung.com");
96MODULE_LICENSE("GPL");