ASoC: omap: rx51: Add DT support

This patch adds device tree support to the Nokia N900 audio driver and
adds documentation for the DT binding.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

2 files changed, 80 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/nokia,rx51.txt b/Documentation/devicetree/bindings/sound/nokia,rx51.txt
new file mode 100644
index 000000000000..72f93d996273
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/nokia,rx51.txt
@@ -0,0 +1,27 @@
+* Nokia N900 audio setup
+
+Required properties:
+- compatible: Should contain "nokia,n900-audio"
+- nokia,cpu-dai: phandle for the McBSP node
+- nokia,audio-codec: phandles for the main TLV320AIC3X node and the
+                     auxiliary TLV320AIC3X node (in this order)
+- nokia,headphone-amplifier: phandle for the TPA6130A2 node
+- tvout-selection-gpios: GPIO for tvout selection
+- jack-detection-gpios: GPIO for jack detection
+- eci-switch-gpios: GPIO for ECI (Enhancement Control Interface) switch
+- speaker-amplifier-gpios: GPIO for speaker amplifier
+
+Example:
+
+sound {
+        compatible = "nokia,n900-audio";
+
+        nokia,cpu-dai = <&mcbsp2>;
+        nokia,audio-codec = <&tlv320aic3x>, <&tlv320aic3x_aux>;
+        nokia,headphone-amplifier = <&tpa6130a2>;
+
+        tvout-selection-gpios = <&gpio2 8 GPIO_ACTIVE_HIGH>; /* 40 */
+        jack-detection-gpios = <&gpio6 17 GPIO_ACTIVE_HIGH>; /* 177 */
+        eci-switch-gpios = <&gpio6 22 GPIO_ACTIVE_HIGH>; /* 182 */
+        speaker-amplifier-gpios = <&twl_gpio 7 GPIO_ACTIVE_HIGH>;
+};
diff --git a/sound/soc/omap/rx51.c b/sound/soc/omap/rx51.c
index 110deca7fcbb..866578bcda55 100644
--- a/sound/soc/omap/rx51.c
+++ b/sound/soc/omap/rx51.c
@@ -386,6 +386,7 @@ static struct snd_soc_card rx51_sound_card = {
 static int rx51_soc_probe(struct platform_device *pdev)
 {
         struct rx51_audio_pdata *pdata;
+        struct device_node *np = pdev->dev.of_node;
         struct snd_soc_card *card = &rx51_sound_card;
         int err;
 
@@ -394,6 +395,49 @@ static int rx51_soc_probe(struct platform_device *pdev)
 
         card->dev = &pdev->dev;
 
+        if (np) {
+                struct device_node *dai_node;
+
+                dai_node = of_parse_phandle(np, "nokia,cpu-dai", 0);
+                if (!dai_node) {
+                        dev_err(&pdev->dev, "McBSP node is not provided\n");
+                        return -EINVAL;
+                }
+                rx51_dai[0].cpu_dai_name = NULL;
+                rx51_dai[0].platform_name = NULL;
+                rx51_dai[0].cpu_of_node = dai_node;
+                rx51_dai[0].platform_of_node = dai_node;
+
+                dai_node = of_parse_phandle(np, "nokia,audio-codec", 0);
+                if (!dai_node) {
+                        dev_err(&pdev->dev, "Codec node is not provided\n");
+                        return -EINVAL;
+                }
+                rx51_dai[0].codec_name = NULL;
+                rx51_dai[0].codec_of_node = dai_node;
+
+                dai_node = of_parse_phandle(np, "nokia,audio-codec", 1);
+                if (!dai_node) {
+                        dev_err(&pdev->dev, "Auxiliary Codec node is not provided\n");
+                        return -EINVAL;
+                }
+                rx51_aux_dev[0].codec_name = NULL;
+                rx51_aux_dev[0].codec_of_node = dai_node;
+                rx51_codec_conf[0].dev_name = NULL;
+                rx51_codec_conf[0].of_node = dai_node;
+
+                dai_node = of_parse_phandle(np, "nokia,headphone-amplifier", 0);
+                if (!dai_node) {
+                        dev_err(&pdev->dev, "Headphone amplifier node is not provided\n");
+                        return -EINVAL;
+                }
+
+                /* TODO: tpa6130a2a driver supports only a single instance, so
+                 * this driver ignores the headphone-amplifier node for now.
+                 * It's already mandatory in the DT binding to be future proof.
+                 */
+        }
+
         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
         if (pdata == NULL) {
                 dev_err(card->dev, "failed to create private data\n");
@@ -463,10 +507,19 @@ static int rx51_soc_remove(struct platform_device *pdev)
         return 0;
 }
 
+#if defined(CONFIG_OF)
+static const struct of_device_id rx51_audio_of_match[] = {
+        { .compatible = "nokia,n900-audio", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, rx51_audio_of_match);
+#endif
+
 static struct platform_driver rx51_soc_driver = {
         .driver = {
                 .name = "rx51-audio",
                 .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(rx51_audio_of_match),
         },
         .probe = rx51_soc_probe,
         .remove = rx51_soc_remove,