ASoC: simple-card: Support setting mclk via a fixed factor
Some platforms require that the codecs mclk is a fixed multiplication
factor of the audio stream rate. Add a optional property to the
binding to hold this factor and implement a hw_params() function to
make use of it.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index 06fe0e2..03a7fdc 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -24,9 +24,32 @@
struct asoc_simple_dai cpu_dai;
struct asoc_simple_dai codec_dai;
} *dai_props;
+ unsigned int mclk_fs;
struct snd_soc_dai_link dai_link[]; /* dynamically allocated */
};
+static int asoc_simple_card_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *codec_dai = rtd->codec_dai;
+ struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
+ unsigned int mclk;
+ int ret = 0;
+
+ if (priv->mclk_fs) {
+ mclk = params_rate(params) * priv->mclk_fs;
+ ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
+ SND_SOC_CLOCK_IN);
+ }
+
+ return ret;
+}
+
+static struct snd_soc_ops asoc_simple_card_ops = {
+ .hw_params = asoc_simple_card_hw_params,
+};
+
static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai,
struct asoc_simple_dai *set)
{
@@ -251,6 +274,7 @@
sprintf(name, "%s-%s", dai_link->cpu_dai_name,
dai_link->codec_dai_name);
dai_link->name = dai_link->stream_name = name;
+ dai_link->ops = &asoc_simple_card_ops;
dev_dbg(dev, "\tname : %s\n", dai_link->stream_name);
dev_dbg(dev, "\tcpu : %s / %04x / %d\n",
@@ -300,6 +324,10 @@
return ret;
}
+ /* Factor to mclk, used in hw_params() */
+ of_property_read_u32(node, "simple-audio-card,mclk-fs",
+ &priv->mclk_fs);
+
dev_dbg(dev, "New simple-card: %s\n", priv->snd_card.name ?
priv->snd_card.name : "");