ASoC: core: Add API for configuration of DAI BCLK ratio

Some codec drivers when running in slave mode require that BCLK to sample rate ratio
is explicitly set by the machine driver as it may not be exactly rate * frame size.

Extend the DAI API by adding :-

int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio);

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h
index ae9a227d35d3538c233b2b1cb777afcbcb4e639d..d8acf0ca77be91c5c58d98c5d5d3f06a7906ed37 100644 (file)
--- a/include/sound/soc-dai.h
+++ b/include/sound/soc-dai.h
@@ -105,6 +105,8 @@ int snd_soc_dai_set_clkdiv(struct snd_soc_dai *dai,
 int snd_soc_dai_set_pll(struct snd_soc_dai *dai,
        int pll_id, int source, unsigned int freq_in, unsigned int freq_out);
 
+int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio);
+
 /* Digital Audio interface formatting */
 int snd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt);
 
@@ -131,6 +133,7 @@ struct snd_soc_dai_ops {
        int (*set_pll)(struct snd_soc_dai *dai, int pll_id, int source,
                unsigned int freq_in, unsigned int freq_out);
        int (*set_clkdiv)(struct snd_soc_dai *dai, int div_id, int div);
+       int (*set_bclk_ratio)(struct snd_soc_dai *dai, unsigned int ratio);
 
        /*
         * DAI format configuration

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 4d0561312f3be0a9f383928b3d74f80a44cdd3b3..31adad04222dc4fc5b2ba6676beb8c5ea2ffdaff 100644 (file)
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3576,6 +3576,22 @@ int snd_soc_codec_set_pll(struct snd_soc_codec *codec, int pll_id, int source,
 }
 EXPORT_SYMBOL_GPL(snd_soc_codec_set_pll);
 
+/**
+ * snd_soc_dai_set_bclk_ratio - configure BCLK to sample rate ratio.
+ * @dai: DAI
+ * @ratio Ratio of BCLK to Sample rate.
+ *
+ * Configures the DAI for a preset BCLK to sample rate ratio.
+ */
+int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio)
+{
+       if (dai->driver && dai->driver->ops->set_bclk_ratio)
+               return dai->driver->ops->set_bclk_ratio(dai, ratio);
+       else
+               return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dai_set_bclk_ratio);
+
 /**
  * snd_soc_dai_set_fmt - configure DAI hardware audio format.
  * @dai: DAI