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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>
This commit is contained in:
Alexander Stein 2014-12-29 13:08:39 +01:00 committed by Takashi Iwai
parent ff6defa6a8
commit b2d8957f28
1 changed files with 42 additions and 3 deletions
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45
sound/atmel/ac97c.c
View File

@ -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);