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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> | |
a0c4dfee | 25 | #include <linux/module.h> |
83ccf16c JMC |
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 | ||
38 | static 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, | |
83ccf16c JMC |
42 | }, |
43 | [MAX77802_CLK_32K_CP] = { | |
44 | .name = "32khz_cp", | |
45 | .ops = &max_gen_clk_ops, | |
83ccf16c JMC |
46 | }, |
47 | }; | |
48 | ||
49 | static 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 | ||
72 | static int max77802_clk_remove(struct platform_device *pdev) | |
73 | { | |
74 | return max_gen_clk_remove(pdev, MAX77802_CLKS_NUM); | |
75 | } | |
76 | ||
77 | static const struct platform_device_id max77802_clk_id[] = { | |
78 | { "max77802-clk", 0}, | |
79 | { }, | |
80 | }; | |
81 | MODULE_DEVICE_TABLE(platform, max77802_clk_id); | |
82 | ||
83 | static struct platform_driver max77802_clk_driver = { | |
84 | .driver = { | |
85 | .name = "max77802-clk", | |
83ccf16c JMC |
86 | }, |
87 | .probe = max77802_clk_probe, | |
88 | .remove = max77802_clk_remove, | |
89 | .id_table = max77802_clk_id, | |
90 | }; | |
91 | ||
92 | module_platform_driver(max77802_clk_driver); | |
93 | ||
94 | MODULE_DESCRIPTION("MAXIM 77802 Clock Driver"); | |
2445a9c5 | 95 | MODULE_AUTHOR("Javier Martinez Canillas <javier@osg.samsung.com"); |
83ccf16c | 96 | MODULE_LICENSE("GPL"); |