Applied "ASoC: mediatek: add MCLK source selection" to the asoc tree

[Mark Brown]

The patch

   ASoC: mediatek: add MCLK source selection

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 0c198ed2ba68b6cc728c5aa3c5486d9e5c328ecd Mon Sep 17 00:00:00 2001
From: PC Liao <pc.liao at mediatek.com>
Date: Wed, 1 Jun 2016 20:00:12 +0800
Subject: [PATCH] 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 at mediatek.com>
Signed-off-by: Mark Brown <broonie at kernel.org>
---
 .../devicetree/bindings/sound/mt8173-rt5650.txt    |  5 +++
 sound/soc/mediatek/mt8173-rt5650.c                 | 45 +++++++++++++++++++++-
 2 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/mt8173-rt5650.txt b/Documentation/devicetree/bindings/sound/mt8173-rt5650.txt
index 5bfa6b60530b..f250fc7c7acc 100644
--- 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 a27a6673dbe3..072934b470a8 100644
--- 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);
 
-- 
2.8.1