linux/drivers/clk/actions/owl-mux.c
Manivannan Sadhasivam a83387729a clk: actions: Add mux clock support
Add support for Actions Semi mux clock together with helper
functions to be used in composite clock.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-04-06 14:17:46 -07:00

61 lines
1.4 KiB
C

// SPDX-License-Identifier: GPL-2.0+
//
// OWL mux clock driver
//
// Copyright (c) 2014 Actions Semi Inc.
// Author: David Liu <liuwei@actions-semi.com>
//
// Copyright (c) 2018 Linaro Ltd.
// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
#include <linux/clk-provider.h>
#include <linux/regmap.h>
#include "owl-mux.h"
u8 owl_mux_helper_get_parent(const struct owl_clk_common *common,
const struct owl_mux_hw *mux_hw)
{
u32 reg;
u8 parent;
regmap_read(common->regmap, mux_hw->reg, &reg);
parent = reg >> mux_hw->shift;
parent &= BIT(mux_hw->width) - 1;
return parent;
}
static u8 owl_mux_get_parent(struct clk_hw *hw)
{
struct owl_mux *mux = hw_to_owl_mux(hw);
return owl_mux_helper_get_parent(&mux->common, &mux->mux_hw);
}
int owl_mux_helper_set_parent(const struct owl_clk_common *common,
struct owl_mux_hw *mux_hw, u8 index)
{
u32 reg;
regmap_read(common->regmap, mux_hw->reg, &reg);
reg &= ~GENMASK(mux_hw->width + mux_hw->shift - 1, mux_hw->shift);
regmap_write(common->regmap, mux_hw->reg,
reg | (index << mux_hw->shift));
return 0;
}
static int owl_mux_set_parent(struct clk_hw *hw, u8 index)
{
struct owl_mux *mux = hw_to_owl_mux(hw);
return owl_mux_helper_set_parent(&mux->common, &mux->mux_hw, index);
}
const struct clk_ops owl_mux_ops = {
.get_parent = owl_mux_get_parent,
.set_parent = owl_mux_set_parent,
.determine_rate = __clk_mux_determine_rate,
};