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ASoC: rt5640: add master clock handling for rt5640

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enable/disable master clock when codec is active or not.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sugar Zhang 2016-02-22 15:56:55 +08:00 committed by Mark Brown
parent 92e963f50f
commit 6049af00fc
3 changed files with 36 additions and 0 deletions
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3
Documentation/devicetree/bindings/sound/rt5640.txt
View File

@ -12,6 +12,9 @@ Required properties:
Optional properties:
- clocks: The phandle of the master clock to the CODEC
- clock-names: Should be "mclk"
- realtek,in1-differential
- realtek,in2-differential
- realtek,in3-differential

31
sound/soc/codecs/rt5640.c
View File

@ -1949,7 +1949,33 @@ static int rt5640_set_dai_pll(struct snd_soc_dai *dai, int pll_id, int source,
static int rt5640_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
struct rt5640_priv *rt5640 = snd_soc_codec_get_drvdata(codec);
int ret;
switch (level) {
case SND_SOC_BIAS_ON:
break;
case SND_SOC_BIAS_PREPARE:
/*
* SND_SOC_BIAS_PREPARE is called while preparing for a
* transition to ON or away from ON. If current bias_level
* is SND_SOC_BIAS_ON, then it is preparing for a transition
* away from ON. Disable the clock in that case, otherwise
* enable it.
*/
if (IS_ERR(rt5640->mclk))
break;
if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_ON) {
clk_disable_unprepare(rt5640->mclk);
} else {
ret = clk_prepare_enable(rt5640->mclk);
if (ret)
return ret;
}
break;
case SND_SOC_BIAS_STANDBY:
if (SND_SOC_BIAS_OFF == snd_soc_codec_get_bias_level(codec)) {
snd_soc_update_bits(codec, RT5640_PWR_ANLG1,
@ -2088,6 +2114,11 @@ static int rt5640_probe(struct snd_soc_codec *codec)
struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
struct rt5640_priv *rt5640 = snd_soc_codec_get_drvdata(codec);
/* Check if MCLK provided */
rt5640->mclk = devm_clk_get(codec->dev, "mclk");
if (PTR_ERR(rt5640->mclk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
rt5640->codec = codec;
snd_soc_codec_force_bias_level(codec, SND_SOC_BIAS_OFF);

2
sound/soc/codecs/rt5640.h
View File

@ -12,6 +12,7 @@
#ifndef _RT5640_H
#define _RT5640_H
#include <linux/clk.h>
#include <sound/rt5640.h>
/* Info */
@ -2097,6 +2098,7 @@ struct rt5640_priv {
struct snd_soc_codec *codec;
struct rt5640_platform_data pdata;
struct regmap *regmap;
struct clk *mclk;
int sysclk;
int sysclk_src;