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- /*
- * 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/module.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@osg.samsung.com");
- MODULE_LICENSE("GPL");
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