Merge branch 'topic/ac97-bus' into for-next

Generic AC97 Device Properties

This documents describes the devicetree bindings for an ac97 controller child

node describing ac97 codecs.

Required properties:

-compatible : Must be "ac97,vendor_id1,vendor_id2

	      The ids shall be the 4 characters hexadecimal encoding, such as

	      given by "%04x" formatting of printf

-reg	    : Must be the ac97 codec number, between 0 and 3

Example:

ac97: sound@40500000 {

	compatible = "marvell,pxa270-ac97";

	reg = < 0x40500000 0x1000 >;

	interrupts = <14>;

	reset-gpios = <&gpio 95 GPIO_ACTIVE_HIGH>;

	#sound-dai-cells = <1>;

	pinctrl-names = "default";

	pinctrl-0 = < &pinctrl_ac97_default >;

	clocks = <&clks CLK_AC97>, <&clks CLK_AC97CONF>;

	clock-names = "AC97CLK", "AC97CONFCLK";

	#address-cells = <1>;

	#size-cells = <0>;

	audio-codec@0 {

		reg = <0>;

		compatible = "ac97,574d,4c13";

		clocks = <&fixed_wm9713_clock>;

		clock-names = "ac97_clk";

	}

};

#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;