ASoC: simple card: Add mclk-fs property in dai-link

Add mclk-fs ratio property per dai-link sub node. This will
allow to manage several codecs with different ratio.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 20 insertions, 4 deletions

diff --git a/Documentation/devicetree/bindings/sound/simple-card.txt b/Documentation/devicetree/bindings/sound/simple-card.txt
index 73bf314f7240..cf3979eb3578 100644
--- a/Documentation/devicetree/bindings/sound/simple-card.txt
+++ b/Documentation/devicetree/bindings/sound/simple-card.txt
@@ -16,7 +16,8 @@ Optional properties:
                                           connection's sink, the second being the connection's
                                           source.
 - simple-audio-card,mclk-fs             : Multiplication factor between stream rate and codec
-                                          mclk.
+                                          mclk. When defined, mclk-fs property defined in
+                                          dai-link sub nodes are ignored.
 - simple-audio-card,hp-det-gpio         : Reference to GPIO that signals when
                                           headphones are attached.
 - simple-audio-card,mic-det-gpio        : Reference to GPIO that signals when
@@ -55,6 +56,9 @@ Optional dai-link subnode properties:
                                           dai-link uses bit clock inversion.
 - frame-inversion                       : bool property. Add this if the
                                           dai-link uses frame clock inversion.
+- mclk-fs                               : Multiplication factor between stream
+                                          rate and codec mclk, applied only for
+                                          the dai-link.
 
 For backward compatibility the frame-master and bitclock-master
 properties can be used as booleans in codec subnode to indicate if the
diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index c87e58504a62..d5554939146e 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -26,6 +26,7 @@ struct simple_card_data {
         struct simple_dai_props {
                 struct asoc_simple_dai cpu_dai;
                 struct asoc_simple_dai codec_dai;
+                unsigned int mclk_fs;
         } *dai_props;
         unsigned int mclk_fs;
         int gpio_hp_det;
@@ -76,11 +77,18 @@ static int asoc_simple_card_hw_params(struct snd_pcm_substream *substream,
         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;
+        struct simple_dai_props *dai_props =
+                &priv->dai_props[rtd - rtd->card->rtd];
+        unsigned int mclk, mclk_fs = 0;
         int ret = 0;
 
-        if (priv->mclk_fs) {
-                mclk = params_rate(params) * priv->mclk_fs;
+        if (priv->mclk_fs)
+                mclk_fs = priv->mclk_fs;
+        else if (dai_props->mclk_fs)
+                mclk_fs = dai_props->mclk_fs;
+
+        if (mclk_fs) {
+                mclk = params_rate(params) * mclk_fs;
                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
                                              SND_SOC_CLOCK_IN);
         }
@@ -313,6 +321,7 @@ static int asoc_simple_card_dai_link_of(struct device_node *node,
         char prop[128];
         char *prefix = "";
         int ret, cpu_args;
+        u32 val;
 
         /* For single DAI link & old style of DT node */
         if (is_top_level_node)
@@ -338,6 +347,9 @@ static int asoc_simple_card_dai_link_of(struct device_node *node,
         if (ret < 0)
                 goto dai_link_of_err;
 
+        if (!of_property_read_u32(node, "mclk-fs", &val))
+                dai_props->mclk_fs = val;
+
         ret = asoc_simple_card_sub_parse_of(cpu, &dai_props->cpu_dai,
                                             &dai_link->cpu_of_node,
                                             &dai_link->cpu_dai_name,