[PATCH 1/6] ASoC: dt-bindings: samsung,aries-wm8994: require sound-dai property

[PATCH 1/6] ASoC: dt-bindings: samsung,aries-wm8994: require sound-dai property

[Krzysztof Kozlowski]

The cpu and codec nodes must provide sound-dai property.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../devicetree/bindings/sound/samsung,aries-wm8994.yaml       | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/samsung,aries-wm8994.yaml b/Documentation/devicetree/bindings/sound/samsung,aries-wm8994.yaml
index eb487ed3ca3b..d5cc221787cf 100644
--- a/Documentation/devicetree/bindings/sound/samsung,aries-wm8994.yaml
+++ b/Documentation/devicetree/bindings/sound/samsung,aries-wm8994.yaml
@@ -33,6 +33,8 @@ properties:
         description: |
           phandles to the I2S controller and bluetooth codec,
           in that order
+    required:
+      - sound-dai
 
   codec:
     type: object
@@ -40,6 +42,8 @@ properties:
       sound-dai:
         $ref: /schemas/types.yaml#/definitions/phandle-array
         description: phandle to the WM8994 CODEC
+    required:
+      - sound-dai
 
   samsung,audio-routing:
     $ref: /schemas/types.yaml#/definitions/non-unique-string-array
-- 
2.32.0

[PATCH 1/6] ASoC: dt-bindings: samsung, aries-wm8994: require sound-dai property

[Krzysztof Kozlowski]

The cpu and codec nodes must provide sound-dai property.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../devicetree/bindings/sound/samsung,aries-wm8994.yaml       | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/samsung,aries-wm8994.yaml b/Documentation/devicetree/bindings/sound/samsung,aries-wm8994.yaml
index eb487ed3ca3b..d5cc221787cf 100644
--- a/Documentation/devicetree/bindings/sound/samsung,aries-wm8994.yaml
+++ b/Documentation/devicetree/bindings/sound/samsung,aries-wm8994.yaml
@@ -33,6 +33,8 @@ properties:
         description: |
           phandles to the I2S controller and bluetooth codec,
           in that order
+    required:
+      - sound-dai
 
   codec:
     type: object
@@ -40,6 +42,8 @@ properties:
       sound-dai:
         $ref: /schemas/types.yaml#/definitions/phandle-array
         description: phandle to the WM8994 CODEC
+    required:
+      - sound-dai
 
   samsung,audio-routing:
     $ref: /schemas/types.yaml#/definitions/non-unique-string-array
-- 
2.32.0

[PATCH 2/6] ASoC: dt-bindings: samsung,arndale: convert to dtschema

[Krzysztof Kozlowski]

Convert the audio complex on Arndale boards with Samsung Exynos SoC to
DT schema format.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../devicetree/bindings/sound/arndale.txt     | 25 -----------
 .../bindings/sound/samsung,arndale.yaml       | 44 +++++++++++++++++++
 2 files changed, 44 insertions(+), 25 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/sound/arndale.txt
 create mode 100644 Documentation/devicetree/bindings/sound/samsung,arndale.yaml

diff --git a/Documentation/devicetree/bindings/sound/arndale.txt b/Documentation/devicetree/bindings/sound/arndale.txt
deleted file mode 100644
index 17530120ccfc..000000000000
--- a/Documentation/devicetree/bindings/sound/arndale.txt
+++ /dev/null
@@ -1,25 +0,0 @@
-Audio Binding for Arndale boards
-
-Required properties:
-- compatible : Can be one of the following:
-		"samsung,arndale-rt5631",
-		"samsung,arndale-wm1811"
-
-- samsung,audio-cpu: The phandle of the Samsung I2S controller
-- samsung,audio-codec: The phandle of the audio codec
-
-Optional:
-- samsung,model: The name of the sound-card
-
-Arndale Boards has many audio daughter cards, one of them is
-rt5631/alc5631. Below example shows audio bindings for rt5631/
-alc5631 based codec.
-
-Example:
-
-sound {
-		compatible = "samsung,arndale-rt5631";
-
-		samsung,audio-cpu = <&i2s0>
-		samsung,audio-codec = <&rt5631>;
-};
diff --git a/Documentation/devicetree/bindings/sound/samsung,arndale.yaml b/Documentation/devicetree/bindings/sound/samsung,arndale.yaml
new file mode 100644
index 000000000000..e7dc65637f02
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/samsung,arndale.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/samsung,arndale.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Insignal Arndale boards audio complex
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+  - Sylwester Nawrocki <s.nawrocki@samsung.com>
+
+properties:
+  compatible:
+    enum:
+      - samsung,arndale-rt5631
+      - samsung,arndale-wm1811
+
+  samsung,audio-codec:
+    description: Phandle to the audio codec.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  samsung,audio-cpu:
+    description: Phandle to the Samsung I2S controller.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  samsung,model:
+    description: The user-visible name of this sound complex.
+    $ref: /schemas/types.yaml#/definitions/string
+
+required:
+  - compatible
+  - samsung,audio-codec
+  - samsung,audio-cpu
+
+additionalProperties: false
+
+examples:
+  - |
+    sound {
+        compatible = "samsung,arndale-rt5631";
+        samsung,audio-cpu = <&i2s0>;
+        samsung,audio-codec = <&rt5631>;
+    };
-- 
2.32.0

[PATCH 3/6] ASoC: dt-bindings: samsung,arndale: document ALC5631

[Krzysztof Kozlowski]

The Arndale audio complex might come with ALC5631 which is compatible
with RT5631.  Document the compatible since it is used in Linux kernel
sources.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 Documentation/devicetree/bindings/sound/samsung,arndale.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/sound/samsung,arndale.yaml b/Documentation/devicetree/bindings/sound/samsung,arndale.yaml
index e7dc65637f02..cea2bf3544f0 100644
--- a/Documentation/devicetree/bindings/sound/samsung,arndale.yaml
+++ b/Documentation/devicetree/bindings/sound/samsung,arndale.yaml
@@ -13,6 +13,7 @@ maintainers:
 properties:
   compatible:
     enum:
+      - samsung,arndale-alc5631
       - samsung,arndale-rt5631
       - samsung,arndale-wm1811
 
-- 
2.32.0

[PATCH 4/6] ASoC: dt-bindings: samsung,smdk5250: convert to dtschema

[Krzysztof Kozlowski]

Convert the audio complex on SMDK5250 boards with Samsung Exynos SoC to
DT schema format.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../bindings/sound/samsung,smdk-wm8994.txt    | 14 -------
 .../bindings/sound/samsung,smdk5250.yaml      | 38 +++++++++++++++++++
 2 files changed, 38 insertions(+), 14 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/sound/samsung,smdk-wm8994.txt
 create mode 100644 Documentation/devicetree/bindings/sound/samsung,smdk5250.yaml

diff --git a/Documentation/devicetree/bindings/sound/samsung,smdk-wm8994.txt b/Documentation/devicetree/bindings/sound/samsung,smdk-wm8994.txt
deleted file mode 100644
index 4686646fb122..000000000000
--- a/Documentation/devicetree/bindings/sound/samsung,smdk-wm8994.txt
+++ /dev/null
@@ -1,14 +0,0 @@
-Samsung SMDK audio complex
-
-Required properties:
-- compatible : "samsung,smdk-wm8994"
-- samsung,i2s-controller: The phandle of the Samsung I2S0 controller
-- samsung,audio-codec: The phandle of the WM8994 audio codec
-Example:
-
-sound {
-		compatible = "samsung,smdk-wm8994";
-
-		samsung,i2s-controller = <&i2s0>;
-		samsung,audio-codec = <&wm8994>;
-};
diff --git a/Documentation/devicetree/bindings/sound/samsung,smdk5250.yaml b/Documentation/devicetree/bindings/sound/samsung,smdk5250.yaml
new file mode 100644
index 000000000000..cb51af90435e
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/samsung,smdk5250.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/samsung,smdk5250.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung SMDK5250 audio complex with WM8994 codec
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+  - Sylwester Nawrocki <s.nawrocki@samsung.com>
+
+properties:
+  compatible:
+    const: samsung,smdk-wm8994
+
+  samsung,audio-codec:
+    description: Phandle to the audio codec.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  samsung,i2s-controller:
+    description: Phandle to the Samsung I2S controller.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+required:
+  - compatible
+  - samsung,audio-codec
+  - samsung,i2s-controller
+
+additionalProperties: false
+
+examples:
+  - |
+    sound {
+        compatible = "samsung,smdk-wm8994";
+        samsung,i2s-controller = <&i2s0>;
+        samsung,audio-codec = <&wm8994>;
+    };
-- 
2.32.0

[RFC 5/6] ASoC: dt-bindings: samsung,snow: convert to dtschema

[Krzysztof Kozlowski]

Convert the audio complex on Google Snow boards with Samsung Exynos SoC
to DT schema format.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

---

TODO: The DTS do not pass cleanly. cpu/sound-dai should be fixed.
---
 .../bindings/sound/samsung,snow.yaml          | 78 +++++++++++++++++++
 .../devicetree/bindings/sound/snow.txt        | 31 --------
 2 files changed, 78 insertions(+), 31 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/sound/samsung,snow.yaml
 delete mode 100644 Documentation/devicetree/bindings/sound/snow.txt

diff --git a/Documentation/devicetree/bindings/sound/samsung,snow.yaml b/Documentation/devicetree/bindings/sound/samsung,snow.yaml
new file mode 100644
index 000000000000..df969b384839
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/samsung,snow.yaml
@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/samsung,snow.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Google Snow audio complex with MAX9809x codec
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+  - Sylwester Nawrocki <s.nawrocki@samsung.com>
+
+properties:
+  compatible:
+    enum:
+      - google,snow-audio-max98090
+      - google,snow-audio-max98091
+      - google,snow-audio-max98095
+
+  codec:
+    type: object
+    properties:
+      sound-dai:
+        description: List of phandles to the CODEC and HDMI IP nodes.
+        $ref: /schemas/types.yaml#/definitions/phandle-array
+        items:
+          - description: Phandle to the MAX98090, MAX98091 or MAX98095 CODEC.
+          - description: Phandle to the HDMI IP block node.
+    required:
+      - sound-dai
+
+  cpu:
+    type: object
+    properties:
+      sound-dai:
+        description: Phandle to the Samsung I2S controller.
+        $ref: /schemas/types.yaml#/definitions/phandle
+        items:
+          - description: Phandle of the I2S controller.
+          - description: Index of the I2S controller.
+    required:
+      - sound-dai
+
+  samsung,audio-codec:
+    description: Phandle to the audio codec.
+    $ref: /schemas/types.yaml#/definitions/phandle
+    deprecated: true
+
+  samsung,i2s-controller:
+    description: Phandle to the Samsung I2S controller.
+    $ref: /schemas/types.yaml#/definitions/phandle
+    deprecated: true
+
+  samsung,model:
+    description: The user-visible name of this sound complex.
+    $ref: /schemas/types.yaml#/definitions/string
+
+required:
+  - compatible
+  - codec
+  - cpu
+
+additionalProperties: false
+
+examples:
+  - |
+    sound {
+        compatible = "google,snow-audio-max98095";
+        samsung,model = "Snow-I2S-MAX98095";
+
+        cpu {
+            sound-dai = <&i2s0 0>;
+        };
+
+        codec {
+            sound-dai = <&max98095 0>, <&hdmi>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/sound/snow.txt b/Documentation/devicetree/bindings/sound/snow.txt
deleted file mode 100644
index 80fd9a87bb3f..000000000000
--- a/Documentation/devicetree/bindings/sound/snow.txt
+++ /dev/null
@@ -1,31 +0,0 @@
-Audio Binding for Snow boards
-
-Required properties:
-- compatible : Can be one of the following,
-			"google,snow-audio-max98090" or
-			"google,snow-audio-max98091" or
-			"google,snow-audio-max98095"
-- samsung,i2s-controller (deprecated): The phandle of the Samsung I2S controller
-- samsung,audio-codec (deprecated): The phandle of the audio codec
-
-Required sub-nodes:
-
- - 'cpu' subnode with a 'sound-dai' property containing the phandle of the I2S
-    controller
- - 'codec' subnode with a 'sound-dai' property containing list of phandles
-    to the CODEC nodes, first entry must be the phandle of the MAX98090,
-    MAX98091 or MAX98095 CODEC (exact device type is indicated by the compatible
-    string) and the second entry must be the phandle of the HDMI IP block node
-
-Optional:
-- samsung,model: The name of the sound-card
-
-Example:
-
-sound {
-		compatible = "google,snow-audio-max98095";
-
-		samsung,model = "Snow-I2S-MAX98095";
-		samsung,i2s-controller = <&i2s0>;
-		samsung,audio-codec = <&max98095>;
-};
-- 
2.32.0

[PATCH 6/6] ASoC: dt-bindings: samsung,tm2: convert to dtschema

[Krzysztof Kozlowski]

Convert the audio complex on Samsung TM2 boards with Samsung Exynos SoC
to DT schema format.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../bindings/sound/samsung,tm2-audio.txt      | 42 ----------
 .../bindings/sound/samsung,tm2.yaml           | 80 +++++++++++++++++++
 2 files changed, 80 insertions(+), 42 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/sound/samsung,tm2-audio.txt
 create mode 100644 Documentation/devicetree/bindings/sound/samsung,tm2.yaml

diff --git a/Documentation/devicetree/bindings/sound/samsung,tm2-audio.txt b/Documentation/devicetree/bindings/sound/samsung,tm2-audio.txt
deleted file mode 100644
index f5ccc12ddc00..000000000000
--- a/Documentation/devicetree/bindings/sound/samsung,tm2-audio.txt
+++ /dev/null
@@ -1,42 +0,0 @@
-Samsung Exynos5433 TM2(E) audio complex with WM5110 codec
-
-Required properties:
-
- - compatible		 : "samsung,tm2-audio"
- - model		 : the user-visible name of this sound complex
- - audio-codec		 : the first entry should be phandle of the wm5110 audio
-			   codec node, as described in ../mfd/arizona.txt;
-			   the second entry should be phandle of the HDMI
-			   transmitter node
- - i2s-controller	 : the list of phandle and argument tuples pointing to
-			   I2S controllers, the first entry should be I2S0 and
-			   the second one I2S1
- - audio-amplifier	 : the phandle of the MAX98504 amplifier
- - samsung,audio-routing : a list of the connections between audio components;
-			   each entry is a pair of strings, the first being the
-			   connection's sink, the second being the connection's
-			   source; valid names for sources and sinks are the
-			   WM5110's and MAX98504's pins and the jacks on the
-			   board: HP, SPK, Main Mic, Sub Mic, Third Mic,
-			   Headset Mic
- - mic-bias-gpios	 : GPIO pin that enables the Main Mic bias regulator
-
-
-Example:
-
-sound {
-	compatible = "samsung,tm2-audio";
-	audio-codec = <&wm5110>, <&hdmi>;
-	i2s-controller = <&i2s0 0>, <&i2s1 0>;
-	audio-amplifier = <&max98504>;
-	mic-bias-gpios = <&gpr3 2 0>;
-	model = "wm5110";
-	samsung,audio-routing =
-		"HP", "HPOUT1L",
-		"HP", "HPOUT1R",
-		"SPK", "SPKOUT",
-		"SPKOUT", "HPOUT2L",
-		"SPKOUT", "HPOUT2R",
-		"Main Mic", "MICBIAS2",
-		"IN1R", "Main Mic";
-};
diff --git a/Documentation/devicetree/bindings/sound/samsung,tm2.yaml b/Documentation/devicetree/bindings/sound/samsung,tm2.yaml
new file mode 100644
index 000000000000..74712d6f3ef4
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/samsung,tm2.yaml
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/samsung,tm2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung Exynos5433 TM2(E) audio complex with WM5110 codec
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+  - Sylwester Nawrocki <s.nawrocki@samsung.com>
+
+properties:
+  compatible:
+    const: samsung,tm2-audio
+
+  audio-amplifier:
+    description: Phandle to the MAX98504 amplifier.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  audio-codec:
+    description: Phandles to the codecs.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - description: Phandle to the WM5110 audio codec.
+      - description: Phandle to the HDMI transmitter node.
+
+  samsung,audio-routing:
+    description: |
+      List of the connections between audio components; each entry is
+      a pair of strings, the first being the connection's sink, the second
+      being the connection's source; valid names for sources and sinks are the
+      WM5110's and MAX98504's pins and the jacks on the board: HP, SPK, Main
+      Mic, Sub Mic, Third Mic, Headset Mic.
+    $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+
+  i2s-controller:
+    description: Phandles to the I2S controllers.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - description: Phandle to I2S0.
+      - description: Phandle to I2S1.
+
+  mic-bias-gpios:
+    description: GPIO pin that enables the Main Mic bias regulator.
+
+  model:
+    description: The user-visible name of this sound complex.
+    $ref: /schemas/types.yaml#/definitions/string
+
+required:
+  - compatible
+  - audio-amplifier
+  - audio-codec
+  - samsung,audio-routing
+  - i2s-controller
+  - mic-bias-gpios
+  - model
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    sound {
+        compatible = "samsung,tm2-audio";
+        audio-codec = <&wm5110>, <&hdmi>;
+        i2s-controller = <&i2s0 0>, <&i2s1 0>;
+        audio-amplifier = <&max98504>;
+        mic-bias-gpios = <&gpr3 2 GPIO_ACTIVE_HIGH>;
+        model = "wm5110";
+        samsung,audio-routing = "HP", "HPOUT1L",
+                                "HP", "HPOUT1R",
+                                "SPK", "SPKOUT",
+                                "SPKOUT", "HPOUT2L",
+                                "SPKOUT", "HPOUT2R",
+                                "RCV", "HPOUT3L",
+                                "RCV", "HPOUT3R";
+    };
-- 
2.32.0

Re: [RFC 5/6] ASoC: dt-bindings: samsung,snow: convert to dtschema

[Rob Herring]

On Mon, Jan 24, 2022 at 06:03:35PM +0100, Krzysztof Kozlowski wrote:
> Convert the audio complex on Google Snow boards with Samsung Exynos SoC
> to DT schema format.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> 
> ---
> 
> TODO: The DTS do not pass cleanly. cpu/sound-dai should be fixed.
> ---
>  .../bindings/sound/samsung,snow.yaml          | 78 +++++++++++++++++++
>  .../devicetree/bindings/sound/snow.txt        | 31 --------
>  2 files changed, 78 insertions(+), 31 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/sound/samsung,snow.yaml
>  delete mode 100644 Documentation/devicetree/bindings/sound/snow.txt
> 
> diff --git a/Documentation/devicetree/bindings/sound/samsung,snow.yaml b/Documentation/devicetree/bindings/sound/samsung,snow.yaml
> new file mode 100644
> index 000000000000..df969b384839
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/samsung,snow.yaml
> @@ -0,0 +1,78 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/samsung,snow.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Google Snow audio complex with MAX9809x codec
> +
> +maintainers:
> +  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> +  - Sylwester Nawrocki <s.nawrocki@samsung.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - google,snow-audio-max98090
> +      - google,snow-audio-max98091
> +      - google,snow-audio-max98095
> +
> +  codec:
> +    type: object
> +    properties:
> +      sound-dai:
> +        description: List of phandles to the CODEC and HDMI IP nodes.
> +        $ref: /schemas/types.yaml#/definitions/phandle-array
> +        items:
> +          - description: Phandle to the MAX98090, MAX98091 or MAX98095 CODEC.
> +          - description: Phandle to the HDMI IP block node.

Thinking about this and the issue you raised some more, we should make 
sure there's a common definition for sound-dai. And then here, it should 
just be the number of entries ('maxItems: 1').

Rob

Re: [RFC 5/6] ASoC: dt-bindings: samsung,snow: convert to dtschema

[Rob Herring]

On Mon, Jan 24, 2022 at 06:03:35PM +0100, Krzysztof Kozlowski wrote:
> Convert the audio complex on Google Snow boards with Samsung Exynos SoC
> to DT schema format.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> 
> ---
> 
> TODO: The DTS do not pass cleanly. cpu/sound-dai should be fixed.
> ---
>  .../bindings/sound/samsung,snow.yaml          | 78 +++++++++++++++++++
>  .../devicetree/bindings/sound/snow.txt        | 31 --------
>  2 files changed, 78 insertions(+), 31 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/sound/samsung,snow.yaml
>  delete mode 100644 Documentation/devicetree/bindings/sound/snow.txt
> 
> diff --git a/Documentation/devicetree/bindings/sound/samsung,snow.yaml b/Documentation/devicetree/bindings/sound/samsung,snow.yaml
> new file mode 100644
> index 000000000000..df969b384839
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/samsung,snow.yaml
> @@ -0,0 +1,78 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/samsung,snow.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Google Snow audio complex with MAX9809x codec
> +
> +maintainers:
> +  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> +  - Sylwester Nawrocki <s.nawrocki@samsung.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - google,snow-audio-max98090
> +      - google,snow-audio-max98091
> +      - google,snow-audio-max98095
> +
> +  codec:
> +    type: object
> +    properties:
> +      sound-dai:
> +        description: List of phandles to the CODEC and HDMI IP nodes.
> +        $ref: /schemas/types.yaml#/definitions/phandle-array
> +        items:
> +          - description: Phandle to the MAX98090, MAX98091 or MAX98095 CODEC.
> +          - description: Phandle to the HDMI IP block node.

Thinking about this and the issue you raised some more, we should make 
sure there's a common definition for sound-dai. And then here, it should 
just be the number of entries ('maxItems: 1').

Rob