/*
|
* Copyright (c) 2017 Rockchip Electronics Co. Ltd.
|
*
|
* Base on code in drivers/clk/clk-mux.c.
|
* See clk-mux.c for further copyright information.
|
*
|
* 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.
|
*/
|
|
#include "clk-regmap.h"
|
|
#define to_clk_regmap_mux(_hw) container_of(_hw, struct clk_regmap_mux, hw)
|
|
static u8 clk_regmap_mux_get_parent(struct clk_hw *hw)
|
{
|
struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
|
u8 index;
|
u32 val;
|
|
regmap_read(mux->regmap, mux->reg, &val);
|
|
index = val >> mux->shift;
|
index &= mux->mask;
|
|
return index;
|
}
|
|
static int clk_regmap_mux_set_parent(struct clk_hw *hw, u8 index)
|
{
|
struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
|
|
return regmap_write(mux->regmap, mux->reg, (index << mux->shift) |
|
(mux->mask << (mux->shift + 16)));
|
}
|
|
const struct clk_ops clk_regmap_mux_ops = {
|
.set_parent = clk_regmap_mux_set_parent,
|
.get_parent = clk_regmap_mux_get_parent,
|
.determine_rate = __clk_mux_determine_rate,
|
};
|
EXPORT_SYMBOL_GPL(clk_regmap_mux_ops);
|
|
struct clk *
|
devm_clk_regmap_register_mux(struct device *dev, const char *name,
|
const char * const *parent_names, u8 num_parents,
|
struct regmap *regmap, u32 reg, u8 shift, u8 width,
|
unsigned long flags)
|
{
|
struct clk_regmap_mux *mux;
|
struct clk_init_data init = {};
|
|
mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
|
if (!mux)
|
return ERR_PTR(-ENOMEM);
|
|
init.name = name;
|
init.ops = &clk_regmap_mux_ops;
|
init.flags = flags;
|
init.parent_names = parent_names;
|
init.num_parents = num_parents;
|
|
mux->dev = dev;
|
mux->regmap = regmap;
|
mux->reg = reg;
|
mux->shift = shift;
|
mux->mask = BIT(width) - 1;
|
mux->hw.init = &init;
|
|
return devm_clk_register(dev, &mux->hw);
|
}
|
EXPORT_SYMBOL_GPL(devm_clk_regmap_register_mux);
|
|
MODULE_LICENSE("GPL");
|
