[RFC 2/2] ARM:Tegra: Device Tree Support: Initialize audio card gpio's from the device tree.

[John Bonesio]

This patch makes it so the gpio's used by the Tegra audio driver are
initialized from device tree nodes.

Signed-off-by: John Bonesio<bones at secretlab.ca>
---

 arch/arm/boot/dts/tegra-harmony.dts |    6 ++++++
 sound/soc/codecs/wm8903.c           |    5 +++++
 sound/soc/tegra/harmony.c           |   37 ++++++++++++++++++-----------------
 3 files changed, 30 insertions(+), 18 deletions(-)

diff --git a/arch/arm/boot/dts/tegra-harmony.dts b/arch/arm/boot/dts/tegra-harmony.dts
index 217a7f0..fc61e02 100644
--- a/arch/arm/boot/dts/tegra-harmony.dts
+++ b/arch/arm/boot/dts/tegra-harmony.dts
@@ -55,6 +55,12 @@
 
 	harmony_audio: audio_card {
 		compatible = "nvidia,harmony-audio";
+
+		gpios = <&codec 226 0>, /* spkr_en, gpio wm8903 #2 */
+			<&gpio 178 0>, /* hp_det, gpio PW2 */
+			<&gpio 184 0>, /* int_mic_en, gpio PX0 */
+			<&gpio 185 0>; /* ext_mic_en, gpio PX1 */
+
 	};
 
 	serial at 70006300 {
diff --git a/sound/soc/codecs/wm8903.c b/sound/soc/codecs/wm8903.c
index a10e3b9..9ad3532 100644
--- a/sound/soc/codecs/wm8903.c
+++ b/sound/soc/codecs/wm8903.c
@@ -1875,6 +1875,11 @@ static void wm8903_init_gpio(struct snd_soc_codec *codec)
 			wm8903->gpio_chip.base = be32_to_cpup(prop);
 	}
 
+#if defined(CONFIG_OF_GPIO)
+	wm8903->gpio_chip.of_node = of_find_compatible_node(NULL, NULL,
+						"wlf,wm8903");
+#endif /* CONFIG_OF_GPIO */
+
 	ret = gpiochip_add(&wm8903->gpio_chip);
 	if (ret != 0)
 		dev_err(codec->dev, "Failed to add GPIOs: %d\n", ret);
diff --git a/sound/soc/tegra/harmony.c b/sound/soc/tegra/harmony.c
index faeec14..40c19f0 100644
--- a/sound/soc/tegra/harmony.c
+++ b/sound/soc/tegra/harmony.c
@@ -34,6 +34,7 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
+#include <linux/of_gpio.h>
 
 #include <mach/harmony_audio.h>
 
@@ -52,18 +53,6 @@
 
 #define DRV_NAME "tegra-snd-harmony"
 
-/* temporary - info will go into device tree */
-#define TEGRA_GPIO_PW2          178
-#define TEGRA_GPIO_PX0          184
-#define TEGRA_GPIO_PX1          185
-
-#define HARMONY_GPIO_WM8903(_x_)	(TEGRA_NR_GPIOS + (_x_))
-#define TEGRA_GPIO_SPKR_EN		HARMONY_GPIO_WM8903(2)
-#define TEGRA_GPIO_HP_DET		TEGRA_GPIO_PW2
-#define TEGRA_GPIO_INT_MIC_EN		TEGRA_GPIO_PX0
-#define TEGRA_GPIO_EXT_MIC_EN		TEGRA_GPIO_PX1
-/* end temporary */
-
 #define GPIO_SPKR_EN    BIT(0)
 #define GPIO_INT_MIC_EN BIT(1)
 #define GPIO_EXT_MIC_EN BIT(2)
@@ -213,6 +202,18 @@ static int harmony_asoc_init(struct snd_soc_pcm_runtime *rtd)
 	struct harmony_audio_platform_data *pdata = harmony->pdata;
 	int ret;
 
+	if (pdata->gpio_spkr_en == -1)
+		pdata->gpio_spkr_en = of_get_gpio(card->dev->of_node, 0);
+
+	if (pdata->gpio_hp_det == -1)
+		pdata->gpio_hp_det = of_get_gpio(card->dev->of_node, 1);
+
+	if (pdata->gpio_int_mic_en == -1)
+		pdata->gpio_int_mic_en = of_get_gpio(card->dev->of_node, 2);
+
+	if (pdata->gpio_ext_mic_en == -1)
+		pdata->gpio_ext_mic_en = of_get_gpio(card->dev->of_node, 3);
+
 	ret = gpio_request(pdata->gpio_spkr_en, "spkr_en");
 	if (ret) {
 		dev_err(card->dev, "cannot get spkr_en gpio\n");
@@ -299,12 +300,12 @@ static struct snd_soc_card snd_soc_harmony = {
 	.num_links = 1,
 };
 
-/* temporary - put this into the device tree */
+/* empty pdata struct - filled in with device tree properties */
 static struct harmony_audio_platform_data harmony_audio_pdata = {
-	.gpio_spkr_en		= TEGRA_GPIO_SPKR_EN,
-	.gpio_hp_det		= TEGRA_GPIO_HP_DET,
-	.gpio_int_mic_en	= TEGRA_GPIO_INT_MIC_EN,
-	.gpio_ext_mic_en	= TEGRA_GPIO_EXT_MIC_EN,
+	.gpio_spkr_en		= -1,
+	.gpio_hp_det		= -1,
+	.gpio_int_mic_en	= -1,
+	.gpio_ext_mic_en	= -1,
 };
 
 static __devinit int tegra_snd_harmony_probe(struct platform_device *pdev)
@@ -328,7 +329,7 @@ static __devinit int tegra_snd_harmony_probe(struct platform_device *pdev)
 #endif
 
 	if (pdev->dev.of_node) {
-		pdev->dev.platform_data = &harmony_audio_pdata; /* temporary */
+		pdev->dev.platform_data = &harmony_audio_pdata;
 		pdata = pdev->dev.platform_data;
 	} else {
 		pdata = pdev->dev.platform_data;