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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>
This commit is contained in:
Andrew Lunn 2014-05-22 17:31:49 +02:00 committed by Mark Brown
parent 648722155d
commit 2942a0e285
2 changed files with 31 additions and 0 deletions
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3
Documentation/devicetree/bindings/sound/simple-card.txt
View File

@ -15,6 +15,9 @@ Optional properties:
Each entry is a pair of strings, the first being the
connection's sink, the second being the connection's
source.
- simple-audio-card,mclk-fs : Multiplication factor between stream rate and codec
mclk.
Optional subnodes:
- simple-audio-card,dai-link : Container for dai-link level

28
sound/soc/generic/simple-card.c
View File

@ -24,9 +24,32 @@ struct simple_card_data {
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 @@ static int simple_card_dai_link_of(struct device_node *node,
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 @@ static int asoc_simple_card_parse_of(struct device_node *node,
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 : "");