ASoC: pxa: pxa-ssp: add DT bindings

The pxa ssp DAI acts as a user of a pxa ssp port, and needs an
appropriate 'port' phandle in DT to reference the upstream.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

2 files changed, 59 insertions, 6 deletions

diff --git a/Documentation/devicetree/bindings/sound/mrvl,pxa-ssp.txt b/Documentation/devicetree/bindings/sound/mrvl,pxa-ssp.txt
new file mode 100644
index 000000000000..74c9ba6c2823
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/mrvl,pxa-ssp.txt
@@ -0,0 +1,28 @@
+Marvell PXA SSP CPU DAI bindings
+
+Required properties:
+
+        compatible      Must be "mrvl,pxa-ssp-dai"
+        port            A phandle reference to a PXA ssp upstream device
+
+Example:
+
+        /* upstream device */
+
+        ssp0: ssp@41000000 {
+                compatible = "mrvl,pxa3xx-ssp";
+                reg = <0x41000000 0x40>;
+                interrupts = <24>;
+                clock-names = "pxa27x-ssp.0";
+                dmas = <&dma 13
+                        &dma 14>;
+                dma-names = "rx", "tx";
+        };
+
+        /* DAI as user */
+
+        ssp_dai0: ssp_dai@0 {
+                compatible = "mrvl,pxa-ssp-dai";
+                port = <&ssp0>;
+        };
+
diff --git a/sound/soc/pxa/pxa-ssp.c b/sound/soc/pxa/pxa-ssp.c
index 6f4dd7543e82..19296f22cb28 100644
--- a/sound/soc/pxa/pxa-ssp.c
+++ b/sound/soc/pxa/pxa-ssp.c
@@ -21,6 +21,7 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/pxa2xx_ssp.h>
+#include <linux/of.h>
 
 #include <asm/irq.h>
 
@@ -719,6 +720,7 @@ static int pxa_ssp_trigger(struct snd_pcm_substream *substream, int cmd,
 
 static int pxa_ssp_probe(struct snd_soc_dai *dai)
 {
+        struct device *dev = dai->dev;
         struct ssp_priv *priv;
         int ret;
 
@@ -726,10 +728,26 @@ static int pxa_ssp_probe(struct snd_soc_dai *dai)
         if (!priv)
                 return -ENOMEM;
 
-        priv->ssp = pxa_ssp_request(dai->id + 1, "SoC audio");
-        if (priv->ssp == NULL) {
-                ret = -ENODEV;
-                goto err_priv;
+        if (dev->of_node) {
+                struct device_node *ssp_handle;
+
+                ssp_handle = of_parse_phandle(dev->of_node, "port", 0);
+                if (!ssp_handle) {
+                        dev_err(dev, "unable to get 'port' phandle\n");
+                        return -ENODEV;
+                }
+
+                priv->ssp = pxa_ssp_request_of(ssp_handle, "SoC audio");
+                if (priv->ssp == NULL) {
+                        ret = -ENODEV;
+                        goto err_priv;
+                }
+        } else {
+                priv->ssp = pxa_ssp_request(dai->id + 1, "SoC audio");
+                if (priv->ssp == NULL) {
+                        ret = -ENODEV;
+                        goto err_priv;
+                }
         }
 
         priv->dai_fmt = (unsigned int) -1;
@@ -798,6 +816,12 @@ static const struct snd_soc_component_driver pxa_ssp_component = {
         .name           = "pxa-ssp",
 };
 
+#ifdef CONFIG_OF
+static const struct of_device_id pxa_ssp_of_ids[] = {
+        { .compatible = "mrvl,pxa-ssp-dai" },
+};
+#endif
+
 static int asoc_ssp_probe(struct platform_device *pdev)
 {
         return snd_soc_register_component(&pdev->dev, &pxa_ssp_component,
@@ -812,8 +836,9 @@ static int asoc_ssp_remove(struct platform_device *pdev)
 
 static struct platform_driver asoc_ssp_driver = {
         .driver = {
-                        .name = "pxa-ssp-dai",
-                        .owner = THIS_MODULE,
+                .name = "pxa-ssp-dai",
+                .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(pxa_ssp_of_ids),
         },
 
         .probe = asoc_ssp_probe,