ALSA: ac97: add codecs devicetree binding

#include <linux/idr.h>

#include <linux/list.h>

#include <linux/mutex.h>

#include <linux/of.h>

#include <linux/pm.h>

#include <linux/pm_runtime.h>

#include <linux/slab.h>

	return ac97_ctrl->codecs[codec_num];

}

static struct device_node *

ac97_of_get_child_device(struct ac97_controller *ac97_ctrl, int idx,

			 unsigned int vendor_id)

{

	struct device_node *node;

	u32 reg;

	char compat[] = "ac97,0000,0000";

	snprintf(compat, sizeof(compat), "ac97,%04x,%04x",

		 vendor_id >> 16, vendor_id & 0xffff);

	for_each_child_of_node(ac97_ctrl->parent->of_node, node) {

		if ((idx != of_property_read_u32(node, "reg", &reg)) ||

		    !of_device_is_compatible(node, compat))

			continue;

		return of_node_get(node);

	}

	return NULL;

}

static void ac97_codec_release(struct device *dev)

{

	struct ac97_codec_device *adev;

	adev = to_ac97_device(dev);

	ac97_ctrl = adev->ac97_ctrl;

	ac97_ctrl->codecs[adev->num] = NULL;

	of_node_put(dev->of_node);

	kfree(adev);

}

	device_initialize(&codec->dev);

	dev_set_name(&codec->dev, "%s:%u", dev_name(ac97_ctrl->parent), idx);

	codec->dev.of_node = ac97_of_get_child_device(ac97_ctrl, idx,

						      vendor_id);

	ret = device_add(&codec->dev);

	if (ret)

	return 0;

err_free_codec:

	of_node_put(codec->dev.of_node);

	put_device(&codec->dev);

	kfree(codec);

	ac97_ctrl->codecs[idx] = NULL;