ASoC: SMDK: WM8994: Add device tree support for machine file

Add the basic device tree based lookup.
Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

Documentation/devicetree/bindings/sound/samsung,smdk-wm8994.txt

+Samsung SMDK audio complex
+
+Required properties:
+- compatible : "samsung,smdk-wm8994"
+- samsung,i2s-controller: The phandle of the Samsung I2S0 controller
+- samsung,audio-codec: The phandle of the WM8994 audio codec
+Example:
+
+sound {
+		compatible = "samsung,smdk-wm8994";
+
+		samsung,i2s-controller = <&i2s0>;
+		samsung,audio-codec = <&wm8994>;
+};

arch/arm/boot/dts/exynos5250-smdk5250.dts

@@ -49,6 +49,11 @@ eeprom@51 {
 			compatible = "samsung,s524ad0xd1";
 			reg = <0x51>;
 		};
+
+		wm8994: wm8994@1a {
+			 compatible = "wlf,wm8994";
+			 reg = <0x1a>;
+		};
 	};
 
 	i2c@121D0000 {
@@ -205,17 +210,24 @@ codec@11000000 {
 		samsung,mfc-l = <0x51000000 0x800000>;
 	};
 
-	i2s@03830000 {
+	i2s0: i2s@03830000 {
 		gpios = <&gpz 0 2 0 0>, <&gpz 1 2 0 0>, <&gpz 2 2 0 0>,
 			<&gpz 3 2 0 0>, <&gpz 4 2 0 0>, <&gpz 5 2 0 0>,
 			<&gpz 6 2 0 0>;
 	};
 
-	i2s@12D60000 {
+	i2s1: i2s@12D60000 {
 		status = "disabled";
 	};
 
-	i2s@12D70000 {
+	i2s2: i2s@12D70000 {
 		status = "disabled";
 	};
+
+	sound {
+		compatible = "samsung,smdk-wm8994";
+
+		samsung,i2s-controller = <&i2s0>;
+		samsung,audio-codec = <&wm8994>;
+	};
 };

arch/arm/boot/dts/exynos5250.dtsi

@@ -269,7 +269,7 @@ dwmmc_3: dwmmc3@12230000 {
 		#size-cells = <0>;
 	};
 
-	i2s@03830000 {
+	i2s0: i2s@03830000 {
 		compatible = "samsung,i2s-v5";
 		reg = <0x03830000 0x100>;
 		dmas = <&pdma0 10
@@ -282,7 +282,7 @@ &pdma0 9
 		samsung,idma-addr = <0x03000000>;
 	};
 
-	i2s@12D60000 {
+	i2s1: i2s@12D60000 {
 		compatible = "samsung,i2s-v5";
 		reg = <0x12D60000 0x100>;
 		dmas = <&pdma1 12
@@ -290,7 +290,7 @@ i2s@12D60000 {
 		dma-names = "tx", "rx";
 	};
 
-	i2s@12D70000 {
+	i2s2: i2s@12D70000 {
 		compatible = "samsung,i2s-v5";
 		reg = <0x12D70000 0x100>;
 		dmas = <&pdma0 12

sound/soc/samsung/smdk_wm8994.c

@@ -10,6 +10,7 @@
 #include "../codecs/wm8994.h"
 #include <sound/pcm_params.h>
 #include <linux/module.h>
+#include <linux/of.h>
 
  /*
   * Default CFG switch settings to use this driver:
@@ -153,9 +154,25 @@ static struct snd_soc_card smdk = {
 static int smdk_audio_probe(struct platform_device *pdev)
 {
 	int ret;
+	struct device_node *np = pdev->dev.of_node;
 	struct snd_soc_card *card = &smdk;
 
 	card->dev = &pdev->dev;
+
+	if (np) {
+		smdk_dai[0].cpu_dai_name = NULL;
+		smdk_dai[0].cpu_of_node = of_parse_phandle(np,
+				"samsung,i2s-controller", 0);
+		if (!smdk_dai[0].cpu_of_node) {
+			dev_err(&pdev->dev,
+			   "Property 'samsung,i2s-controller' missing or invalid\n");
+			ret = -EINVAL;
+		}
+
+		smdk_dai[0].platform_name = NULL;
+		smdk_dai[0].platform_of_node = smdk_dai[0].cpu_of_node;
+	}
+
 	ret = snd_soc_register_card(card);
 
 	if (ret)
@@ -173,10 +190,19 @@ static int smdk_audio_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id samsung_wm8994_of_match[] = {
+	{ .compatible = "samsung,smdk-wm8994", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, samsung_wm8994_of_match);
+#endif /* CONFIG_OF */
+
 static struct platform_driver smdk_audio_driver = {
 	.driver		= {
 		.name	= "smdk-audio",
 		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(samsung_wm8994_of_match),
 	},
 	.probe		= smdk_audio_probe,
 	.remove		= smdk_audio_remove,