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>

diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
index 5e6a1db..cf4cedf 100644 (file)
--- 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);