The 'link-name' property is an optional DT property that allows for the
customization of the name associated with the DAI link and PCM stream.
This functionality mirrors the approach commonly utilized in Qualcomm
audio cards, providing flexibility in DAI naming conventions for
improved system integration and userspace experience.
It allows userspace program to easy determine PCM stream purpose, e.g.:
~ # cat /proc/asound/pcm
00-00: speaker (*) : : playback 1
00-01: mics (*) : : capture 1
00-02: loopback (*) : : capture 1
Signed-off-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxxxxx>
---
.../devicetree/bindings/sound/amlogic,axg-sound-card.yaml | 6 ++++++
.../devicetree/bindings/sound/amlogic,gx-sound-card.yaml | 6 ++++++
2 files changed, 12 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/amlogic,axg-sound-card.yaml b/Documentation/devicetree/bindings/sound/amlogic,axg-sound-card.yaml
index 492b41cc8ccd..46774a3e4b1d 100644
--- a/Documentation/devicetree/bindings/sound/amlogic,axg-sound-card.yaml
+++ b/Documentation/devicetree/bindings/sound/amlogic,axg-sound-card.yaml
@@ -66,6 +66,11 @@ patternProperties:
maxItems: 1
description: phandle of the CPU DAI
+ link-name:
+ description: Indicates dai-link name and PCM stream name.
+ $ref: /schemas/types.yaml#/definitions/string
+ maxItems: 1
+
patternProperties:
"^dai-tdm-slot-(t|r)x-mask-[0-3]$":
$ref: /schemas/types.yaml#/definitions/uint32-array
@@ -137,6 +142,7 @@ examples:
dai-link-0 {
sound-dai = <&frddr_a>;
+ link-name = "speaker";
};
dai-link-1 {
diff --git a/Documentation/devicetree/bindings/sound/amlogic,gx-sound-card.yaml b/Documentation/devicetree/bindings/sound/amlogic,gx-sound-card.yaml
index d4277d342e69..975c148f9712 100644
--- a/Documentation/devicetree/bindings/sound/amlogic,gx-sound-card.yaml
+++ b/Documentation/devicetree/bindings/sound/amlogic,gx-sound-card.yaml
@@ -52,6 +52,11 @@ patternProperties:
maxItems: 1
description: phandle of the CPU DAI
+ link-name:
+ description: Indicates dai-link name and PCM stream name.
+ $ref: /schemas/types.yaml#/definitions/string
+ maxItems: 1
+
patternProperties:
"^codec(-[0-9]+)?$":
type: object
@@ -89,6 +94,7 @@ examples:
dai-link-0 {
sound-dai = <&i2s_fifo>;
+ link-name = "speaker";
};
dai-link-1 {
--
2.43.0
