[alsa-devel] [PATCH v2 1/3] ASoC: max98090: read micbias from device property
yang.a.fang at intel.com
yang.a.fang at intel.com
Thu May 28 20:00:46 CEST 2015
From: "Fang, Yang A" <yang.a.fang at intel.com>
This patch reads max98090 micbias from acpi or dt
Signed-off-by: Fang, Yang A <yang.a.fang at 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
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