projects / linux-2.6-block.git / blame
| 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> | |
| 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, | |
| 42 | .flags = CLK_IS_ROOT, | |
| 43 | }, | |
| 44 | [MAX77802_CLK_32K_CP] = { | |
| 45 | .name = "32khz_cp", | |
| 46 | .ops = &max_gen_clk_ops, | |
| 47 | .flags = CLK_IS_ROOT, | |
| 48 | }, | |
| 49 | }; | |
| 50 | ||
| 51 | static int max77802_clk_probe(struct platform_device *pdev) | |
| 52 | { | |
| 53 | struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
| 54 | int ret; | |
| 55 | ||
| 56 | ret = max_gen_clk_probe(pdev, iodev->regmap, MAX77802_REG_32KHZ, | |
| 57 | max77802_clks_init, MAX77802_CLKS_NUM); | |
| 58 | ||
| 59 | if (ret) { | |
| 60 | dev_err(&pdev->dev, "generic probe failed %d\n", ret); | |
| 61 | return ret; | |
| 62 | } | |
| 63 | ||
| 64 | /* Enable low-jitter mode on the 32khz clocks. */ | |
| 65 | ret = regmap_update_bits(iodev->regmap, MAX77802_REG_32KHZ, | |
| 66 | 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT, | |
| 67 | 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT); | |
| 68 | if (ret < 0) | |
| 69 | dev_err(&pdev->dev, "failed to enable low-jitter mode\n"); | |
| 70 | ||
| 71 | return ret; | |
| 72 | } | |
| 73 | ||
| 74 | static int max77802_clk_remove(struct platform_device *pdev) | |
| 75 | { | |
| 76 | return max_gen_clk_remove(pdev, MAX77802_CLKS_NUM); | |
| 77 | } | |
| 78 | ||
| 79 | static const struct platform_device_id max77802_clk_id[] = { | |
| 80 | { "max77802-clk", 0}, | |
| 81 | { }, | |
| 82 | }; | |
| 83 | MODULE_DEVICE_TABLE(platform, max77802_clk_id); | |
| 84 | ||
| 85 | static struct platform_driver max77802_clk_driver = { | |
| 86 | .driver = { | |
| 87 | .name = "max77802-clk", | |
| 83ccf16c JMC |
88 | }, |
| 89 | .probe = max77802_clk_probe, | |
| 90 | .remove = max77802_clk_remove, | |
| 91 | .id_table = max77802_clk_id, | |
| 92 | }; | |
| 93 | ||
| 94 | module_platform_driver(max77802_clk_driver); | |
| 95 | ||
| 96 | MODULE_DESCRIPTION("MAXIM 77802 Clock Driver"); | |
| 2445a9c5 | 97 | MODULE_AUTHOR("Javier Martinez Canillas <javier@osg.samsung.com"); |
| 83ccf16c | 98 | MODULE_LICENSE("GPL"); |