ASoC: mediatek: add MCLK source selection

The new machine's MCLK source is from mt8173 which is dynamic from
sampling rate*256. This patch provides the selection for device tree.

Signed-off-by: PC Liao <pc.liao@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/mt8173-rt5650.txt b/Documentation/devicetree/bindings/sound/mt8173-rt5650.txt
index 5bfa6b6..f250fc7 100644 (file)
--- a/Documentation/devicetree/bindings/sound/mt8173-rt5650.txt
+++ b/Documentation/devicetree/bindings/sound/mt8173-rt5650.txt
@@ -12,12 +12,17 @@ Required codec-capture subnode properties:
   <&rt5650 0> : Default setting. Connect rt5650 I2S1 for capture. (dai_name = rt5645-aif1)
   <&rt5650 1> : Connect rt5650 I2S2 for capture. (dai_name = rt5645-aif2)
 
+- mediatek,mclk: the MCLK source
+  0 : external oscillator, MCLK = 12.288M
+  1 : internal source from mt8173, MCLK = sampling rate*256
+
 Example:
 
        sound {
                compatible = "mediatek,mt8173-rt5650";
                mediatek,audio-codec = <&rt5650>;
                mediatek,platform = <&afe>;
+               mediatek,mclk = <0>;
                codec-capture {
                        sound-dai = <&rt5650 1>;
                };

diff --git a/sound/soc/mediatek/mt8173-rt5650.c b/sound/soc/mediatek/mt8173-rt5650.c
index a27a667..072934b 100644 (file)
--- a/sound/soc/mediatek/mt8173-rt5650.c
+++ b/sound/soc/mediatek/mt8173-rt5650.c
@@ -23,6 +23,20 @@
 
 #define MCLK_FOR_CODECS                12288000
 
+enum mt8173_rt5650_mclk {
+       MT8173_RT5650_MCLK_EXTERNAL = 0,
+       MT8173_RT5650_MCLK_INTERNAL,
+};
+
+struct mt8173_rt5650_platform_data {
+       enum mt8173_rt5650_mclk pll_from;
+       /* 0 = external oscillator; 1 = internal source from mt8173 */
+};
+
+static struct mt8173_rt5650_platform_data mt8173_rt5650_priv = {
+       .pll_from = MT8173_RT5650_MCLK_EXTERNAL,
+};
+
 static const struct snd_soc_dapm_widget mt8173_rt5650_widgets[] = {
        SND_SOC_DAPM_SPK("Speaker", NULL),
        SND_SOC_DAPM_MIC("Int Mic", NULL),
@@ -54,13 +68,29 @@ static int mt8173_rt5650_hw_params(struct snd_pcm_substream *substream,
                                   struct snd_pcm_hw_params *params)
 {
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       unsigned int mclk_clock;
        int i, ret;
 
+       switch (mt8173_rt5650_priv.pll_from) {
+       case MT8173_RT5650_MCLK_EXTERNAL:
+               /* mclk = 12.288M */
+               mclk_clock = MCLK_FOR_CODECS;
+               break;
+       case MT8173_RT5650_MCLK_INTERNAL:
+               /* mclk = sampling rate*256 */
+               mclk_clock = params_rate(params) * 256;
+               break;
+       default:
+               /* mclk = 12.288M */
+               mclk_clock = MCLK_FOR_CODECS;
+               break;
+       }
+
        for (i = 0; i < rtd->num_codecs; i++) {
                struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
 
-               /* pll from mclk 12.288M */
-               ret = snd_soc_dai_set_pll(codec_dai, 0, 0, MCLK_FOR_CODECS,
+               /* pll from mclk */
+               ret = snd_soc_dai_set_pll(codec_dai, 0, 0, mclk_clock,
                                          params_rate(params) * 512);
                if (ret)
                        return ret;
@@ -243,6 +273,17 @@ static int mt8173_rt5650_dev_probe(struct platform_device *pdev)
                mt8173_rt5650_codecs[1].dai_name = codec_capture_dai;
        }
 
+       if (device_property_present(&pdev->dev, "mediatek,mclk")) {
+               ret = device_property_read_u32(&pdev->dev,
+                                              "mediatek,mclk",
+                                              &mt8173_rt5650_priv.pll_from);
+               if (ret) {
+                       dev_err(&pdev->dev,
+                               "%s snd_soc_register_card fail %d\n",
+                               __func__, ret);
+               }
+       }
+
        card->dev = &pdev->dev;
        platform_set_drvdata(pdev, card);