[PATCH v2 1/3] ASoC: max98090: read micbias from device property

[yang.a.fang@intel.com]

From: "Fang, Yang A" <yang.a.fang@intel.com>

This patch reads max98090 micbias from acpi or dt

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
---
 .../devicetree/bindings/sound/max98090.txt         |    2 ++
 sound/soc/codecs/max98090.c                        |    8 +++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/sound/max98090.txt b/Documentation/devicetree/bindings/sound/max98090.txt
index aa802a2..eecb710 100644
--- a/Documentation/devicetree/bindings/sound/max98090.txt
+++ b/Documentation/devicetree/bindings/sound/max98090.txt
@@ -18,6 +18,8 @@ Optional properties:
 
 - maxim,dmic-freq: Frequency at which to clock DMIC
 
+- maxim,micbias: Micbias voltage applies to the analog mic
+
 Pins on the device (for linking into audio routes):
 
   * MIC1
diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c
index c230626..4b61db7 100644
--- a/sound/soc/codecs/max98090.c
+++ b/sound/soc/codecs/max98090.c
@@ -2419,6 +2419,8 @@ static int max98090_probe(struct snd_soc_codec *codec)
 	struct max98090_cdata *cdata;
 	enum max98090_type devtype;
 	int ret = 0;
+	int err;
+	unsigned int micbias;
 
 	dev_dbg(codec->dev, "max98090_probe\n");
 
@@ -2503,8 +2505,12 @@ static int max98090_probe(struct snd_soc_codec *codec)
 	snd_soc_write(codec, M98090_REG_BIAS_CONTROL,
 		M98090_VCM_MODE_MASK);
 
+	err = device_property_read_u32(codec->dev, "maxim,micbias", &micbias);
+	if (err || micbias < M98090_MBVSEL_2V2  || micbias > M98090_MBVSEL_2V8)
+		micbias = M98090_MBVSEL_2V8;
+
 	snd_soc_update_bits(codec, M98090_REG_MIC_BIAS_VOLTAGE,
-		M98090_MBVSEL_MASK, M98090_MBVSEL_2V8);
+		M98090_MBVSEL_MASK, micbias);
 
 	max98090_add_widgets(codec);
 
-- 
1.7.9.5