mirror of https://gitee.com/openkylin/linux.git
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR MIT)
|
|
/*
|
|
* Copyright (c) 2018 BayLibre, SAS.
|
|
* Author: Jerome Brunet <jbrunet@baylibre.com>
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include "clkc-audio.h"
|
|
|
|
/*
|
|
* This is a special clock for the audio controller.
|
|
* The phase of mst_sclk clock output can be controlled independently
|
|
* for the outside world (ph0), the tdmout (ph1) and tdmin (ph2).
|
|
* Controlling these 3 phases as just one makes things simpler and
|
|
* give the same clock view to all the element on the i2s bus.
|
|
* If necessary, we can still control the phase in the tdm block
|
|
* which makes these independent control redundant.
|
|
*/
|
|
static inline struct meson_clk_triphase_data *
|
|
meson_clk_triphase_data(struct clk_regmap *clk)
|
|
{
|
|
return (struct meson_clk_triphase_data *)clk->data;
|
|
}
|
|
|
|
static void meson_clk_triphase_sync(struct clk_hw *hw)
|
|
{
|
|
struct clk_regmap *clk = to_clk_regmap(hw);
|
|
struct meson_clk_triphase_data *tph = meson_clk_triphase_data(clk);
|
|
unsigned int val;
|
|
|
|
/* Get phase 0 and sync it to phase 1 and 2 */
|
|
val = meson_parm_read(clk->map, &tph->ph0);
|
|
meson_parm_write(clk->map, &tph->ph1, val);
|
|
meson_parm_write(clk->map, &tph->ph2, val);
|
|
}
|
|
|
|
static int meson_clk_triphase_get_phase(struct clk_hw *hw)
|
|
{
|
|
struct clk_regmap *clk = to_clk_regmap(hw);
|
|
struct meson_clk_triphase_data *tph = meson_clk_triphase_data(clk);
|
|
unsigned int val;
|
|
|
|
/* Phase are in sync, reading phase 0 is enough */
|
|
val = meson_parm_read(clk->map, &tph->ph0);
|
|
|
|
return meson_clk_degrees_from_val(val, tph->ph0.width);
|
|
}
|
|
|
|
static int meson_clk_triphase_set_phase(struct clk_hw *hw, int degrees)
|
|
{
|
|
struct clk_regmap *clk = to_clk_regmap(hw);
|
|
struct meson_clk_triphase_data *tph = meson_clk_triphase_data(clk);
|
|
unsigned int val;
|
|
|
|
val = meson_clk_degrees_to_val(degrees, tph->ph0.width);
|
|
meson_parm_write(clk->map, &tph->ph0, val);
|
|
meson_parm_write(clk->map, &tph->ph1, val);
|
|
meson_parm_write(clk->map, &tph->ph2, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct clk_ops meson_clk_triphase_ops = {
|
|
.init = meson_clk_triphase_sync,
|
|
.get_phase = meson_clk_triphase_get_phase,
|
|
.set_phase = meson_clk_triphase_set_phase,
|
|
};
|
|
EXPORT_SYMBOL_GPL(meson_clk_triphase_ops);
|