ALSA: sound/atmel/ac97c.c: Add device tree support

This adds device tree support for the AC97 controller. It uses the
soc-ac97link bindings, but actually only ac97-reset is used.

Signed-off-by: Alexander Stein <alexanders83@web.de>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 42 insertions, 3 deletions

diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
index 5e6a1db70948..cf4cedf2b420 100644
--- a/sound/atmel/ac97c.c
+++ b/sound/atmel/ac97c.c
@@ -22,6 +22,9 @@
 #include <linux/gpio.h>
 #include <linux/types.h>
 #include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_device.h>
 
 #include <sound/core.h>
 #include <sound/initval.h>
@@ -902,6 +905,40 @@ static void atmel_ac97c_reset(struct atmel_ac97c *chip)
         }
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id atmel_ac97c_dt_ids[] = {
+        { .compatible = "atmel,at91sam9263-ac97c", },
+        { }
+};
+MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids);
+
+static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
+{
+        struct ac97c_platform_data *pdata;
+        struct device_node *node = dev->of_node;
+        const struct of_device_id *match;
+
+        if (!node) {
+                dev_err(dev, "Device does not have associated DT data\n");
+                return ERR_PTR(-EINVAL);
+        }
+
+        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return ERR_PTR(-ENOMEM);
+
+        pdata->reset_pin = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
+
+        return pdata;
+}
+#else
+static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
+{
+        dev_err(dev, "no platform data defined\n");
+        return ERR_PTR(-ENXIO);
+}
+#endif
+
 static int atmel_ac97c_probe(struct platform_device *pdev)
 {
         struct snd_card                 *card;
@@ -922,10 +959,11 @@ static int atmel_ac97c_probe(struct platform_device *pdev)
                 return -ENXIO;
         }
 
-        pdata = pdev->dev.platform_data;
+        pdata = dev_get_platdata(&pdev->dev);
         if (!pdata) {
-                dev_dbg(&pdev->dev, "no platform data\n");
-                return -ENXIO;
+                pdata = atmel_ac97c_probe_dt(&pdev->dev);
+                if (IS_ERR(pdata))
+                        return PTR_ERR(pdata);
         }
 
         irq = platform_get_irq(pdev, 0);
@@ -1204,6 +1242,7 @@ static struct platform_driver atmel_ac97c_driver = {
         .driver         = {
                 .name   = "atmel_ac97c",
                 .pm     = ATMEL_AC97C_PM_OPS,
+                .of_match_table = of_match_ptr(atmel_ac97c_dt_ids),
         },
 };
 module_platform_driver(atmel_ac97c_driver);