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authorRobert Jarzmik <robert.jarzmik@free.fr>2018-06-22 21:28:34 +0200
committerTakashi Iwai <tiwai@suse.de>2018-06-25 10:03:32 +0200
commit2225a3e6af78e605119e0f178ae957d860882b1d (patch)
treea42503c11a22a61d9004ffebed81d08ccd8af0ce /sound/ac97
parentcc51574ad2632dde790241129617bb97f46f7c85 (diff)
downloadlinux-stericsson-2225a3e6af78e605119e0f178ae957d860882b1d.tar.gz
ALSA: ac97: add codecs devicetree binding
Add a devicetree binding for codecs. This is especially useful if the AC97 bitclk clock is provided by the codec, as it has to be described in the devicetree description for the ac97 bus code to aquire it. Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/ac97')
-rw-r--r--sound/ac97/bus.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/sound/ac97/bus.c b/sound/ac97/bus.c
index 31f858eceffc..7a0dfca03a57 100644
--- a/sound/ac97/bus.c
+++ b/sound/ac97/bus.c
@@ -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;