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/*
* Clkout driver for Rockchip RK808
*
* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
*
* Author:Chris Zhong <zyw@rock-chips.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*/
#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/mfd/rk808.h>
#include <linux/i2c.h>
struct rk808_clkout {
struct rk808 *rk808;
struct clk_hw clkout1_hw;
struct clk_hw clkout2_hw;
};
static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
return 32768;
}
static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
{
struct rk808_clkout *rk808_clkout = container_of(hw,
struct rk808_clkout,
clkout2_hw);
struct rk808 *rk808 = rk808_clkout->rk808;
return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
}
static int rk808_clkout2_prepare(struct clk_hw *hw)
{
return rk808_clkout2_enable(hw, true);
}
static void rk808_clkout2_unprepare(struct clk_hw *hw)
{
rk808_clkout2_enable(hw, false);
}
static int rk808_clkout2_is_prepared(struct clk_hw *hw)
{
struct rk808_clkout *rk808_clkout = container_of(hw,
struct rk808_clkout,
clkout2_hw);
struct rk808 *rk808 = rk808_clkout->rk808;
uint32_t val;
int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
if (ret < 0)
return ret;
return (val & CLK32KOUT2_EN) ? 1 : 0;
}
static const struct clk_ops rk808_clkout1_ops = {
.recalc_rate = rk808_clkout_recalc_rate,
};
static const struct clk_ops rk808_clkout2_ops = {
.prepare = rk808_clkout2_prepare,
.unprepare = rk808_clkout2_unprepare,
.is_prepared = rk808_clkout2_is_prepared,
.recalc_rate = rk808_clkout_recalc_rate,
};
static struct clk_hw *
of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
{
struct rk808_clkout *rk808_clkout = data;
unsigned int idx = clkspec->args[0];
if (idx >= 2) {
pr_err("%s: invalid index %u\n", __func__, idx);
return ERR_PTR(-EINVAL);
}
return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
}
static int rk808_clkout_probe(struct platform_device *pdev)
{
struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
struct i2c_client *client = rk808->i2c;
struct device_node *node = client->dev.of_node;
struct clk_init_data init = {};
struct rk808_clkout *rk808_clkout;
int ret;
rk808_clkout = devm_kzalloc(&client->dev,
sizeof(*rk808_clkout), GFP_KERNEL);
if (!rk808_clkout)
return -ENOMEM;
rk808_clkout->rk808 = rk808;
init.parent_names = NULL;
init.num_parents = 0;
init.name = "rk808-clkout1";
init.ops = &rk808_clkout1_ops;
rk808_clkout->clkout1_hw.init = &init;
/* optional override of the clockname */
of_property_read_string_index(node, "clock-output-names",
0, &init.name);
ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout1_hw);
if (ret)
return ret;
init.name = "rk808-clkout2";
init.ops = &rk808_clkout2_ops;
rk808_clkout->clkout2_hw.init = &init;
/* optional override of the clockname */
of_property_read_string_index(node, "clock-output-names",
1, &init.name);
ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout2_hw);
if (ret)
return ret;
return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
rk808_clkout);
}
static struct platform_driver rk808_clkout_driver = {
.probe = rk808_clkout_probe,
.driver = {
.name = "rk808-clkout",
},
};
module_platform_driver(rk808_clkout_driver);
MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rk808-clkout");
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