ASoC: rt5651: add ACPI and OF support

Add required tables and the binding document for ACPI and OF matching.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/rt5651.txt

+RT5651 audio CODEC
+
+This device supports I2C only.
+
+Required properties:
+
+- compatible : "realtek,rt5651".
+
+- reg : The I2C address of the device.
+
+Optional properties:
+
+- realtek,in2-differential
+  Boolean. Indicate MIC2 input are differential, rather than single-ended.
+
+- realtek,dmic-en
+  Boolean. true if dmic is used.
+
+Pins on the device (for linking into audio routes) for RT5651:
+
+  * DMIC L1
+  * DMIC R1
+  * IN1P
+  * IN2P
+  * IN2N
+  * IN3P
+  * HPOL
+  * HPOR
+  * LOUTL
+  * LOUTR
+  * PDML
+  * PDMR
+
+Example:
+
+codec: rt5651@1a {
+	compatible = "realtek,rt5651";
+	reg = <0x1a>;
+	realtek,dmic-en = "true";
+	realtek,in2-diff = "false";
+};

sound/soc/codecs/rt5651.c

@@ -18,6 +18,7 @@
 #include <linux/regmap.h>
 #include <linux/platform_device.h>
 #include <linux/spi/spi.h>
+#include <linux/acpi.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -1735,12 +1736,38 @@ static const struct regmap_config rt5651_regmap = {
 	.num_ranges = ARRAY_SIZE(rt5651_ranges),
 };
 
+#if defined(CONFIG_OF)
+static const struct of_device_id rt5651_of_match[] = {
+	{ .compatible = "realtek,rt5651", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, rt5651_of_match);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id rt5651_acpi_match[] = {
+	{ "10EC5651", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, rt5651_acpi_match);
+#endif
+
 static const struct i2c_device_id rt5651_i2c_id[] = {
 	{ "rt5651", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, rt5651_i2c_id);
 
+static int rt5651_parse_dt(struct rt5651_priv *rt5651, struct device_node *np)
+{
+	rt5651->pdata.in2_diff = of_property_read_bool(np,
+		"realtek,in2-differential");
+	rt5651->pdata.dmic_en = of_property_read_bool(np,
+		"realtek,dmic-en");
+
+	return 0;
+}
+
 static int rt5651_i2c_probe(struct i2c_client *i2c,
 		    const struct i2c_device_id *id)
 {
@@ -1757,6 +1784,8 @@ static int rt5651_i2c_probe(struct i2c_client *i2c,
 
 	if (pdata)
 		rt5651->pdata = *pdata;
+	else if (i2c->dev.of_node)
+		rt5651_parse_dt(rt5651, i2c->dev.of_node);
 
 	rt5651->regmap = devm_regmap_init_i2c(i2c, &rt5651_regmap);
 	if (IS_ERR(rt5651->regmap)) {
@@ -1806,6 +1835,8 @@ static int rt5651_i2c_remove(struct i2c_client *i2c)
 static struct i2c_driver rt5651_i2c_driver = {
 	.driver = {
 		.name = "rt5651",
+		.acpi_match_table = ACPI_PTR(rt5651_acpi_match),
+		.of_match_table = of_match_ptr(rt5651_of_match),
 	},
 	.probe = rt5651_i2c_probe,
 	.remove   = rt5651_i2c_remove,