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
37static 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
50static 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
73static int max77802_clk_remove(struct platform_device *pdev)
74{
75	return max_gen_clk_remove(pdev, MAX77802_CLKS_NUM);
76}
77
78static const struct platform_device_id max77802_clk_id[] = {
79	{ "max77802-clk", 0},
80	{ },
81};
82MODULE_DEVICE_TABLE(platform, max77802_clk_id);
83
84static struct platform_driver max77802_clk_driver = {
85	.driver = {
86		.name  = "max77802-clk",
87	},
88	.probe = max77802_clk_probe,
89	.remove = max77802_clk_remove,
90	.id_table = max77802_clk_id,
91};
92
93module_platform_driver(max77802_clk_driver);
94
95MODULE_DESCRIPTION("MAXIM 77802 Clock Driver");
96MODULE_AUTHOR("Javier Martinez Canillas <javier.martinez@collabora.co.uk>");
97MODULE_LICENSE("GPL");
98