[RFC 1/2] ARM:Tegra: Device Tree Support: Initialize the audio card from the device tree.

[John Bonesio <bones-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>]

This patch makes it so the top level audio card is initialized from the device
tree. This is just the first step getting the audio complex of devices
iniialized from device tree nodes.

Signed-off-by: John Bonesio<bones-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
---

 arch/arm/boot/dts/tegra-harmony.dts |    4 +++
 arch/arm/mach-tegra/board-dt.c      |    3 ++
 sound/soc/tegra/harmony.c           |   45 ++++++++++++++++++++++++++++++++---
 3 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/tegra-harmony.dts b/arch/arm/boot/dts/tegra-harmony.dts
index 05521a5..217a7f0 100644
--- a/arch/arm/boot/dts/tegra-harmony.dts
+++ b/arch/arm/boot/dts/tegra-harmony.dts
@@ -53,6 +53,10 @@
 		clock-frequency = <400000>;
 	};
 
+	harmony_audio: audio_card {
+		compatible = "nvidia,harmony-audio";
+	};
+
 	serial@70006300 {
 		status = "ok";
 		clock-frequency = < 216000000 >;
diff --git a/arch/arm/mach-tegra/board-dt.c b/arch/arm/mach-tegra/board-dt.c
index c498e84..a569ad9 100644
--- a/arch/arm/mach-tegra/board-dt.c
+++ b/arch/arm/mach-tegra/board-dt.c
@@ -56,6 +56,9 @@ static struct platform_device *tegra250_devices[] __initdata = {
 	&tegra_i2c_device2,
 	&tegra_i2c_device3,
 	&tegra_i2c_device4,
+	&tegra_i2s_device1,
+	&tegra_das_device,
+	&tegra_pcm_device,
 };
 
 static __initdata struct tegra_clk_init_table tegra_dt_clk_init_table[] = {
diff --git a/sound/soc/tegra/harmony.c b/sound/soc/tegra/harmony.c
index f225087..faeec14 100644
--- a/sound/soc/tegra/harmony.c
+++ b/sound/soc/tegra/harmony.c
@@ -52,6 +52,18 @@
 
 #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)
@@ -287,6 +299,14 @@ static struct snd_soc_card snd_soc_harmony = {
 	.num_links = 1,
 };
 
+/* temporary - put this into the device tree */
+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,
+};
+
 static __devinit int tegra_snd_harmony_probe(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = &snd_soc_harmony;
@@ -307,10 +327,15 @@ static __devinit int tegra_snd_harmony_probe(struct platform_device *pdev)
 	}
 #endif
 
-	pdata = pdev->dev.platform_data;
-	if (!pdata) {
-		dev_err(&pdev->dev, "no platform data supplied\n");
-		return -EINVAL;
+	if (pdev->dev.of_node) {
+		pdev->dev.platform_data = &harmony_audio_pdata; /* temporary */
+		pdata = pdev->dev.platform_data;
+	} else {
+		pdata = pdev->dev.platform_data;
+		if (!pdata) {
+			dev_err(&pdev->dev, "no platform data supplied\n");
+			return -EINVAL;
+		}
 	}
 
 	harmony = kzalloc(sizeof(struct tegra_harmony), GFP_KERNEL);
@@ -374,11 +399,23 @@ static int __devexit tegra_snd_harmony_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#if defined(CONFIG_OF)
+/* Match table for of_platform binding */
+static const struct of_device_id harmony_of_match[] __devinitconst = {
+	{ .compatible = "nvidia,harmony-audio", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, harmony_of_match);
+#endif
+
 static struct platform_driver tegra_snd_harmony_driver = {
 	.driver = {
 		.name = DRV_NAME,
 		.owner = THIS_MODULE,
 		.pm = &snd_soc_pm_ops,
+#if defined(CONFIG_OF)
+		.of_match_table = harmony_of_match,
+#endif
 	},
 	.probe = tegra_snd_harmony_probe,
 	.remove = __devexit_p(tegra_snd_harmony_remove),