98 lines
2.6 KiB
C
Executable File
98 lines
2.6 KiB
C
Executable File
/*
|
|
* 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/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.martinez@collabora.co.uk>");
|
|
MODULE_LICENSE("GPL");
|