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/*
* Clock driver for ams AS3722 device.
*
* Copyright (c) 2013, NVIDIA Corporation.
*
* Author: Laxman Dewangan <ldewangan@nvidia.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 version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
* whether express or implied; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/mfd/as3722.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct as3722_clks {
struct device *dev;
struct as3722 *as3722;
bool enabled_at_boot;
};
static int as3722_clks_prepare(struct as3722_clks *as3722_clks)
{
int ret;
ret = as3722_update_bits(as3722_clks->as3722, AS3722_RTC_CONTROL_REG,
AS3722_RTC_CLK32K_OUT_EN, AS3722_RTC_CLK32K_OUT_EN);
if (ret < 0)
dev_err(as3722_clks->dev, "RTC_CONTROL_REG update failed, %d\n",
ret);
return ret;
}
static void as3722_clks_unprepare(struct as3722_clks *as3722_clks)
{
int ret;
ret = as3722_update_bits(as3722_clks->as3722, AS3722_RTC_CONTROL_REG,
AS3722_RTC_CLK32K_OUT_EN, 0);
if (ret < 0)
dev_err(as3722_clks->dev, "RTC_CONTROL_REG update failed, %d\n",
ret);
}
static int as3722_clks_probe(struct platform_device *pdev)
{
struct as3722_clks *as3722_clks;
struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
struct device_node *np = pdev->dev.parent->of_node;
struct as3722_platform_data *pdata = as3722->dev->platform_data;
bool clk32k_enable = false;
int ret;
if (pdata) {
clk32k_enable = pdata->enable_clk32k_out;
} else {
if (np)
clk32k_enable = of_property_read_bool(np,
"ams,enable-clock32k-out");
}
as3722_clks = devm_kzalloc(&pdev->dev, sizeof(*as3722_clks),
GFP_KERNEL);
if (!as3722_clks)
return -ENOMEM;
platform_set_drvdata(pdev, as3722_clks);
as3722_clks->dev = &pdev->dev;
as3722_clks->as3722 = as3722;
as3722_clks->enabled_at_boot = clk32k_enable;
if (clk32k_enable) {
ret = as3722_clks_prepare(as3722_clks);
if (ret < 0)
dev_err(&pdev->dev,
"Fail to enable clk32k out %d\n", ret);
return ret;
} else {
as3722_clks_unprepare(as3722_clks);
}
return 0;
}
static struct platform_driver as3722_clks_driver = {
.driver = {
.name = "as3722-clk",
.owner = THIS_MODULE,
},
.probe = as3722_clks_probe,
};
static int __init as3722_clk_init(void)
{
return platform_driver_register(&as3722_clks_driver);
}
subsys_initcall(as3722_clk_init);
static void __exit as3722_clk_exit(void)
{
platform_driver_unregister(&as3722_clks_driver);
}
module_exit(as3722_clk_exit);
MODULE_DESCRIPTION("Clock driver for ams AS3722 PMIC Device");
MODULE_ALIAS("platform:as3722-clk");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_LICENSE("GPL v2");
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