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ASoC: max98095: Add master clock handling

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If master clock is provided through device tree, then update
the master clock frequency during set_sysclk.

Documentation has been updated to reflect the change.

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Tushar Behera 2014-05-26 13:58:22 +05:30 committed by Mark Brown
parent c4839c87f5
commit e3048c3d2b
2 changed files with 30 additions and 0 deletions
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6
Documentation/devicetree/bindings/sound/max98095.txt
View File

@ -8,6 +8,12 @@ Required properties:
- reg : The I2C address of the device.
Optional properties:
- clocks: The phandle of the master clock to the CODEC
- clock-names: Should be "mclk"
Example:
max98095: codec@11 {

24
sound/soc/codecs/max98095.c
View File

@ -15,6 +15,7 @@
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/clk.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
@ -42,6 +43,7 @@ struct max98095_priv {
struct regmap *regmap;
enum max98095_type devtype;
struct max98095_pdata *pdata;
struct clk *mclk;
unsigned int sysclk;
struct max98095_cdata dai[3];
const char **eq_texts;
@ -1395,6 +1397,11 @@ static int max98095_dai_set_sysclk(struct snd_soc_dai *dai,
if (freq == max98095->sysclk)
return 0;
if (!IS_ERR(max98095->mclk)) {
freq = clk_round_rate(max98095->mclk, freq);
clk_set_rate(max98095->mclk, freq);
}
/* Setup clocks for slave mode, and using the PLL
* PSCLK = 0x01 (when master clk is 10MHz to 20MHz)
* 0x02 (when master clk is 20MHz to 40MHz)..
@ -1634,6 +1641,19 @@ static int max98095_set_bias_level(struct snd_soc_codec *codec,
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(max98095->mclk)) {
if (codec->dapm.bias_level == SND_SOC_BIAS_ON)
clk_disable_unprepare(max98095->mclk);
else
clk_prepare_enable(max98095->mclk);
}
break;
case SND_SOC_BIAS_STANDBY:
@ -2238,6 +2258,10 @@ static int max98095_probe(struct snd_soc_codec *codec)
struct i2c_client *client;
int ret = 0;
max98095->mclk = devm_clk_get(codec->dev, "mclk");
if (PTR_ERR(max98095->mclk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
/* reset the codec, the DSP core, and disable all interrupts */
max98095_reset(codec);