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

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This commit is contained in:
Takashi Iwai 2018-06-25 10:03:39 +02:00
commit ab1bcc93b7
2 changed files with 58 additions and 0 deletions
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32
Documentation/devicetree/bindings/sound/ac97-bus.txt Normal file
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@ -0,0 +1,32 @@
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";
}
};

26
sound/ac97/bus.c
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@ -13,6 +13,7 @@
#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>
@ -68,6 +69,27 @@ ac97_codec_find(struct ac97_controller *ac97_ctrl, unsigned int codec_num)
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;
@ -76,6 +98,7 @@ static void ac97_codec_release(struct device *dev)
adev = to_ac97_device(dev);
ac97_ctrl = adev->ac97_ctrl;
ac97_ctrl->codecs[adev->num] = NULL;
of_node_put(dev->of_node);
kfree(adev);
}
@ -98,6 +121,8 @@ static int ac97_codec_add(struct ac97_controller *ac97_ctrl, int idx,
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)
@ -105,6 +130,7 @@ static int ac97_codec_add(struct ac97_controller *ac97_ctrl, int idx,
return 0;
err_free_codec:
of_node_put(codec->dev.of_node);
put_device(&codec->dev);
kfree(codec);
ac97_ctrl->codecs[idx] = NULL;