[alsa-devel] [PATCH v3 3/3] ASoC: rt5645: add device tree support

[Bard Liao]

Modify the RT5645 driver to parse platform data from device tree.
Write a DT binding document to describe those properties.

Signed-off-by: Bard Liao <bardliao at realtek.com>
---
* Add hp-detect-gpios' property
---
 Documentation/devicetree/bindings/sound/rt5645.txt | 72 ++++++++++++++++++++++
 sound/soc/codecs/rt5645.c                          | 16 +++++
 2 files changed, 88 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/rt5645.txt

diff --git a/Documentation/devicetree/bindings/sound/rt5645.txt b/Documentation/devicetree/bindings/sound/rt5645.txt
new file mode 100644
index 0000000..7cee1f5
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/rt5645.txt
@@ -0,0 +1,72 @@
+RT5650/RT5645 audio CODEC
+
+This device supports I2C only.
+
+Required properties:
+
+- compatible : One of "realtek,rt5645" or "realtek,rt5650".
+
+- reg : The I2C address of the device.
+
+- interrupts : The CODEC's interrupt output.
+
+Optional properties:
+
+- hp-detect-gpios:
+  a GPIO spec for the external headphone detect pin. If jd-mode = 0,
+  we will get the JD status by getting the value of hp-detect-gpios.
+
+- realtek,in2-differential
+  Boolean. Indicate MIC2 input are differential, rather than single-ended.
+
+- realtek,dmic1-data-pin
+  0: dmic1 is not used
+  1: using IN2P pin as dmic1 data pin
+  2: using GPIO6 pin as dmic1 data pin
+  3: using GPIO10 pin as dmic1 data pin
+  4: using GPIO12 pin as dmic1 data pin
+
+- realtek,dmic2-data-pin
+  0: dmic2 is not used
+  1: using IN2N pin as dmic2 data pin
+  2: using GPIO5 pin as dmic2 data pin
+  3: using GPIO11 pin as dmic2 data pin
+
+-- realtek,jd-mode : The JD mode of rt5645/rt5650
+   0 : rt5645/rt5650 JD function is not used
+   1 : Mode-0 (VDD=3.3V), two port jack detection
+   2 : Mode-1 (VDD=3.3V), one port jack detection
+   3 : Mode-2 (VDD=1.8V), one port jack detection
+
+Pins on the device (for linking into audio routes) for RT5645/RT5650:
+
+  * DMIC L1
+  * DMIC R1
+  * DMIC L2
+  * DMIC R2
+  * IN1P
+  * IN1N
+  * IN2P
+  * IN2N
+  * Haptic Generator
+  * HPOL
+  * HPOR
+  * LOUTL
+  * LOUTR
+  * PDM1L
+  * PDM1R
+  * SPOL
+  * SPOR
+
+Example:
+
+codec: rt5650 at 1a {
+	compatible = "realtek,rt5650";
+	reg = <0x1a>;
+	hp-detect-gpios = <&gpio 19 0>;
+	interrupt-parent = <&gpio>;
+	interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+	realtek,dmic-en = "true";
+	realtek,en-jd-func = "true";
+	realtek,jd-mode = <3>;
+};
\ No newline at end of file
diff --git a/sound/soc/codecs/rt5645.c b/sound/soc/codecs/rt5645.c
index 27a9492..9eff4ea 100644
--- a/sound/soc/codecs/rt5645.c
+++ b/sound/soc/codecs/rt5645.c
@@ -3226,6 +3226,20 @@ static struct dmi_system_id dmi_platform_intel_braswell[] = {
 	{ }
 };
 
+static int rt5645_parse_dt(struct rt5645_priv *rt5645, struct device_node *np)
+{
+	rt5645->pdata.in2_diff = device_property_read_bool(np,
+		"realtek,in2-differential");
+	device_property_read_u32(np,
+		"realtek,dmic1-data-pin", &rt5645->pdata.dmic1_data_pin);
+	device_property_read_u32(np,
+		"realtek,dmic2-data-pin", &rt5645->pdata.dmic2_data_pin);
+	device_property_read_u32(np,
+		"realtek,jd-mode", &rt5645->pdata.jd_mode);
+
+	return 0;
+}
+
 static int rt5645_i2c_probe(struct i2c_client *i2c,
 		    const struct i2c_device_id *id)
 {
@@ -3244,6 +3258,8 @@ static int rt5645_i2c_probe(struct i2c_client *i2c,
 
 	if (pdata) {
 		rt5645->pdata = *pdata;
+	} else if (i2c->dev.of_node) {
+		rt5645_parse_dt(rt5645, i2c->dev.of_node);
 	} else {
 		if (dmi_check_system(dmi_platform_intel_braswell)) {
 			rt5645->pdata = *rt5645_pdata;
-- 
1.8.1.1.439.g50a6b54