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>

diff --git a/Documentation/devicetree/bindings/sound/mrvl,pxa-ssp.txt b/Documentation/devicetree/bindings/sound/mrvl,pxa-ssp.txt
new file mode 100644 (file)
index 0000000..74c9ba6
--- /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 6f4dd75..19296f2 100644 (file)
--- 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,