linux-kernel - [PATCH 3/3] ASoC: rt5677: add a platform config option for DACREF source

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Date:	Wed, 10 Dec 2014 20:15:27 -0800
From:	Ben Zhang <benzh@...omium.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	alsa-devel@...a-project.org, Liam Girdwood <lgirdwood@...il.com>,
	Bard Liao <bardliao@...ltek.com>,
	Oder Chiou <oder_chiou@...ltek.com>,
	Anatol Pomozov <anatol@...gle.com>,
	Dylan Reid <dgreid@...omium.org>,
	Albert Chen <albertchen@...ltek.com>,
	linux-kernel@...r.kernel.org, Ben Zhang <benzh@...omium.org>
Subject: [PATCH 3/3] ASoC: rt5677: add a platform config option for DACREF source

DACREF power source can come from external 1.8V or codec internal 1.8V.
This patch adds the option to enable the internal DACREF power source.

Signed-off-by: Ben Zhang <benzh@...omium.org>
---
 Documentation/devicetree/bindings/sound/rt5677.txt | 3 +++
 include/sound/rt5677.h                             | 2 ++
 sound/soc/codecs/rt5677.c                          | 9 +++++++++
 3 files changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/rt5677.txt b/Documentation/devicetree/bindings/sound/rt5677.txt
index f54d0dd..f06d52a 100644
--- a/Documentation/devicetree/bindings/sound/rt5677.txt
+++ b/Documentation/devicetree/bindings/sound/rt5677.txt
@@ -22,6 +22,9 @@ Optional properties:
 - realtek,micbias1
   Select 0/1/2/3 to set MICBIAS1 voltage to 1.476V/2.970V/1.242V/2.475V
 
+- realtek,internal-dacref-en
+  Select codec internal 1.8V as DACREF source optionally.
+
 - realtek,in1-differential
 - realtek,in2-differential
 - realtek,lout1-differential
diff --git a/include/sound/rt5677.h b/include/sound/rt5677.h
index efa74bb..42866f3 100644
--- a/include/sound/rt5677.h
+++ b/include/sound/rt5677.h
@@ -28,6 +28,8 @@ enum rt5677_dmic2_clk {
 struct rt5677_platform_data {
 	/* MICBIAS output voltage control */
 	enum rt5677_micbias micbias1;
+	/* Select codec internal 1.8V as DACREF source optionally */
+	bool internal_dacref_en;
 	/* IN1/IN2/LOUT1/LOUT2/LOUT3 can optionally be differential */
 	bool in1_diff;
 	bool in2_diff;
diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
index ac4bee8..e6d7bb4 100644
--- a/sound/soc/codecs/rt5677.c
+++ b/sound/soc/codecs/rt5677.c
@@ -4552,6 +4552,8 @@ MODULE_DEVICE_TABLE(i2c, rt5677_i2c_id);
 static int rt5677_parse_dt(struct rt5677_priv *rt5677, struct device_node *np)
 {
 	of_property_read_u32(np, "realtek,micbias1", &rt5677->pdata.micbias1);
+	rt5677->pdata.internal_dacref_en = of_property_read_bool(np,
+					"realtek,internal-dacref-en");
 	rt5677->pdata.in1_diff = of_property_read_bool(np,
 					"realtek,in1-differential");
 	rt5677->pdata.in2_diff = of_property_read_bool(np,
@@ -4728,6 +4730,13 @@ static int rt5677_i2c_probe(struct i2c_client *i2c,
 			RT5677_MICBIAS1_CTRL_VDD_MASK,
 			rt5677->pdata.micbias1 << RT5677_MICBIAS1_CTRL_VDD_SFT);
 
+	if (rt5677->pdata.internal_dacref_en) {
+		regmap_update_bits(rt5677->regmap, RT5677_PR_BASE +
+				RT5677_TEST_CTRL1, 1 << 9, 1 << 9);
+		regmap_update_bits(rt5677->regmap, RT5677_PR_BASE +
+				RT5677_SOFT_DEPOP_DAC_CLK_CTRL, 1 << 5, 1 << 5);
+	}
+
 	if (rt5677->pdata.in1_diff)
 		regmap_update_bits(rt5677->regmap, RT5677_IN1,
 					RT5677_IN_DF1, RT5677_IN_DF1);
-- 
2.2.0.rc0.207.ga3a616c

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