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>

4 files changed, 58 insertions, 6 deletions

diff --git a/Documentation/devicetree/bindings/sound/samsung,smdk-wm8994.txt b/Documentation/devicetree/bindings/sound/samsung,smdk-wm8994.txt
new file mode 100644
index 000000000000..4686646fb122
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/samsung,smdk-wm8994.txt
@@ -0,0 +1,14 @@
+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>;
+};
diff --git a/arch/arm/boot/dts/exynos5250-smdk5250.dts b/arch/arm/boot/dts/exynos5250-smdk5250.dts
index 78fee35d09fc..127b8cd1385c 100644
--- a/arch/arm/boot/dts/exynos5250-smdk5250.dts
+++ b/arch/arm/boot/dts/exynos5250-smdk5250.dts
@@ -49,6 +49,11 @@
                         compatible = "samsung,s524ad0xd1";
                         reg = <0x51>;
                 };
+
+                wm8994: wm8994@1a {
+                         compatible = "wlf,wm8994";
+                         reg = <0x1a>;
+                };
         };
 
         i2c@121D0000 {
@@ -205,17 +210,24 @@
                 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>;
+        };
 };
diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi
index fe05b60a3984..a320b4ac11dd 100644
--- a/arch/arm/boot/dts/exynos5250.dtsi
+++ b/arch/arm/boot/dts/exynos5250.dtsi
@@ -269,7 +269,7 @@
                 #size-cells = <0>;
         };
 
-        i2s@03830000 {
+        i2s0: i2s@03830000 {
                 compatible = "samsung,i2s-v5";
                 reg = <0x03830000 0x100>;
                 dmas = <&pdma0 10
@@ -282,7 +282,7 @@
                 samsung,idma-addr = <0x03000000>;
         };
 
-        i2s@12D60000 {
+        i2s1: i2s@12D60000 {
                 compatible = "samsung,i2s-v5";
                 reg = <0x12D60000 0x100>;
                 dmas = <&pdma1 12
@@ -290,7 +290,7 @@
                 dma-names = "tx", "rx";
         };
 
-        i2s@12D70000 {
+        i2s2: i2s@12D70000 {
                 compatible = "samsung,i2s-v5";
                 reg = <0x12D70000 0x100>;
                 dmas = <&pdma0 12
diff --git a/sound/soc/samsung/smdk_wm8994.c b/sound/soc/samsung/smdk_wm8994.c
index cc2f407e9f1b..581ea4a06fc6 100644
--- a/sound/soc/samsung/smdk_wm8994.c
+++ b/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,