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* Copyright (C) 2016 Socionext Inc.
* Author: Masahiro Yamada <>
* 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
* GNU General Public License for more details.
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/regmap.h>
#include "clk-uniphier.h"
struct uniphier_clk_mux {
struct clk_hw hw;
struct regmap *regmap;
unsigned int reg;
const unsigned int *masks;
const unsigned int *vals;
#define to_uniphier_clk_mux(_hw) container_of(_hw, struct uniphier_clk_mux, hw)
static int uniphier_clk_mux_set_parent(struct clk_hw *hw, u8 index)
struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw);
return regmap_write_bits(mux->regmap, mux->reg, mux->masks[index],
static u8 uniphier_clk_mux_get_parent(struct clk_hw *hw)
struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw);
unsigned int num_parents = clk_hw_get_num_parents(hw);
int ret;
unsigned int val;
unsigned int i;
ret = regmap_read(mux->regmap, mux->reg, &val);
if (ret)
return ret;
for (i = 0; i < num_parents; i++)
if ((mux->masks[i] & val) == mux->vals[i])
return i;
return -EINVAL;
static const struct clk_ops uniphier_clk_mux_ops = {
.determine_rate = __clk_mux_determine_rate,
.set_parent = uniphier_clk_mux_set_parent,
.get_parent = uniphier_clk_mux_get_parent,
struct clk_hw *uniphier_clk_register_mux(struct device *dev,
struct regmap *regmap,
const char *name,
const struct uniphier_clk_mux_data *data)
struct uniphier_clk_mux *mux;
struct clk_init_data init;
int ret;
mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
if (!mux)
return ERR_PTR(-ENOMEM); = name;
init.ops = &uniphier_clk_mux_ops;
init.flags = CLK_SET_RATE_PARENT;
init.parent_names = data->parent_names;
init.num_parents = data->num_parents,
mux->regmap = regmap;
mux->reg = data->reg;
mux->masks = data->masks;
mux->vals = data->vals;
mux->hw.init = &init;
ret = devm_clk_hw_register(dev, &mux->hw);
if (ret)
return ERR_PTR(ret);
return &mux->hw;