99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* clk-max77802.c - Clock driver for Maxim 77802
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*
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* Copyright (C) 2014 Google, Inc
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*
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* Copyright (C) 2012 Samsung Electornics
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* Jonghwa Lee <jonghwa3.lee@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* This driver is based on clk-max77686.c
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/max77686-private.h>
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#include <linux/clk-provider.h>
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#include <linux/mutex.h>
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#include <linux/clkdev.h>
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#include <dt-bindings/clock/maxim,max77802.h>
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#include "clk-max-gen.h"
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#define MAX77802_CLOCK_OPMODE_MASK 0x1
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#define MAX77802_CLOCK_LOW_JITTER_SHIFT 0x3
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static struct clk_init_data max77802_clks_init[MAX77802_CLKS_NUM] = {
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[MAX77802_CLK_32K_AP] = {
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.name = "32khz_ap",
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.ops = &max_gen_clk_ops,
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.flags = CLK_IS_ROOT,
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},
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[MAX77802_CLK_32K_CP] = {
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.name = "32khz_cp",
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.ops = &max_gen_clk_ops,
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.flags = CLK_IS_ROOT,
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},
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};
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static int max77802_clk_probe(struct platform_device *pdev)
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{
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struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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int ret;
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ret = max_gen_clk_probe(pdev, iodev->regmap, MAX77802_REG_32KHZ,
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max77802_clks_init, MAX77802_CLKS_NUM);
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if (ret) {
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dev_err(&pdev->dev, "generic probe failed %d\n", ret);
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return ret;
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}
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/* Enable low-jitter mode on the 32khz clocks. */
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ret = regmap_update_bits(iodev->regmap, MAX77802_REG_32KHZ,
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1 << MAX77802_CLOCK_LOW_JITTER_SHIFT,
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1 << MAX77802_CLOCK_LOW_JITTER_SHIFT);
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if (ret < 0)
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dev_err(&pdev->dev, "failed to enable low-jitter mode\n");
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return ret;
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}
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static int max77802_clk_remove(struct platform_device *pdev)
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{
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return max_gen_clk_remove(pdev, MAX77802_CLKS_NUM);
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}
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static const struct platform_device_id max77802_clk_id[] = {
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{ "max77802-clk", 0},
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{ },
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};
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MODULE_DEVICE_TABLE(platform, max77802_clk_id);
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static struct platform_driver max77802_clk_driver = {
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.driver = {
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.name = "max77802-clk",
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},
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.probe = max77802_clk_probe,
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.remove = max77802_clk_remove,
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.id_table = max77802_clk_id,
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};
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module_platform_driver(max77802_clk_driver);
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MODULE_DESCRIPTION("MAXIM 77802 Clock Driver");
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MODULE_AUTHOR("Javier Martinez Canillas <javier@osg.samsung.com");
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MODULE_LICENSE("GPL");
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