diff options
| author | Tushar Behera <tushar.behera@linaro.org> | 2014-05-26 13:58:22 +0530 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-05-26 16:18:59 +0100 |
| commit | e3048c3d2be5b4a1c6a66db3bf3829c77b7788e0 (patch) | |
| tree | 3971800a6088e044d62aad85b3be127064c5ac77 /sound/soc/codecs/max98095.c | |
| parent | c4839c87f508bdb2e5d735a064124dd6289a2853 (diff) | |
ASoC: max98095: Add master clock handling
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>
Diffstat (limited to 'sound/soc/codecs/max98095.c')
| -rw-r--r-- | sound/soc/codecs/max98095.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sound/soc/codecs/max98095.c b/sound/soc/codecs/max98095.c index 8e548af9eac8..7dbca28875fe 100644 --- a/sound/soc/codecs/max98095.c +++ b/sound/soc/codecs/max98095.c @@ -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); |