[PATCH v4 03/22] ASoC: dt-bindings: tdm-slot: Allow indexed TDM idle properties

[James Calligeros]

Some consumers may wish to configure a codec's TDM idle properties
at runtime based on specific dai-link-level conditions. This could
be achieved by doing something like

dai-link at 0 {
    dai-tdm-idle-mode = "pulldown";
    dai-tdm-slot-tx-idle-mask = <0xf0f0>;

    cpu {
        sound-dai = <&some_cpu>;
    };
    codec {
        sound-dai = <&some_codec>;
    };
};

But what if we have a dai-link with multiple codecs across multiple
CPUs? What if the machine driver parsing the dai-link only expects
idle properties for specific codecs? We can extend the idle properties
with an index, allowing unique idle configurations for specific
components in the dai-link:

dai-link at 1 {
    dai-tdm-idle-mode-0 = "zero";
    dai-tdm-idle-mode-2 = "zero";
    dai-tdm-slot-tx-idle-mask-0 = <0xf0f0>;
    dai-tdm-slot-tx-idle-mask-2 = <0x0f0f>;

    cpu {
        sound-dai = <&some_cpu0>, <&some_cpu2>;
    };
    codec {
        sound-dai = <&some_codec0>, <&some_codec1>,
                    <&some_codec2>, <&some_codec3>;
    };
};

Extend the TDM idle properties to optionally allow this indexing.

Signed-off-by: James Calligeros <jcalligeros99 at gmail.com>
---
 .../devicetree/bindings/sound/tdm-slot.yaml        | 34 ++++++++++++----------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/tdm-slot.yaml b/Documentation/devicetree/bindings/sound/tdm-slot.yaml
index 457a899e8872..dafa5fa77006 100644
--- a/Documentation/devicetree/bindings/sound/tdm-slot.yaml
+++ b/Documentation/devicetree/bindings/sound/tdm-slot.yaml
@@ -20,20 +20,6 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: Width, in bits, of each slot
 
-  dai-tdm-idle-mode:
-    $ref: /schemas/types.yaml#/definitions/string
-    enum:
-      - none
-      - off
-      - zero
-      - pulldown
-      - hiz
-      - pullup
-      - drivehigh
-    description: Drive mode for inactive/idle TDM slots. For hardware that
-      implements .set_tdm_idle(). Optional. "None" represents undefined
-      behaviour and is the same as not setting this property.
-
 patternProperties:
   '^dai-tdm-slot-[rt]x-mask$':
     $ref: /schemas/types.yaml#/definitions/uint32-array
@@ -44,9 +30,25 @@ patternProperties:
       a mask. The first element of the array is slot 0 (LSB). Any nonzero
       value will be treated as 1.
 
-  '^dai-tdm-slot-[rt]x-idle-mask$':
+  '^dai-tdm-slot-[rt]x-idle-mask(-[0-9]+)?$':
     $ref: /schemas/types.yaml#/definitions/uint32
     description: Idle slot mask. Optional. A bit being set to 1 indicates
-      that the corresponding TDM slot is inactive/idle.
+      that the corresponding TDM slot is inactive/idle. Can be defined on
+      a per-component basis.
+
+  '^dai-tdm-idle-mode(-[0-9]+)?$':
+    $ref: /schemas/types.yaml#/definitions/string
+    enum:
+      - none
+      - off
+      - zero
+      - pulldown
+      - hiz
+      - pullup
+      - drivehigh
+    description: Drive mode for inactive/idle TDM slots. For hardware that
+      implements .set_tdm_idle(). Optional. "None" represents undefined
+      behaviour and is the same as not setting this property. Can be defined
+      on a per-component basis.
 
 additionalProperties: true

-- 
2.56.0