ASoC: dt-bindings: Convert brcm,bcm2835-i2s to DT schema

Convert the Broadcom BCM2835 I2S/PCM binding to DT schema format. It's a
straightforward conversion.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250812203356.735234-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/brcm,bcm2835-i2s.txt

@@ -1,24 +0,0 @@
-* Broadcom BCM2835 SoC I2S/PCM module
-
-Required properties:
-- compatible: "brcm,bcm2835-i2s"
-- reg: Should contain PCM registers location and length.
-- clocks: the (PCM) clock to use
-- dmas: List of DMA controller phandle and DMA request line ordered pairs.
-- dma-names: Identifier string for each DMA request line in the dmas property.
-  These strings correspond 1:1 with the ordered pairs in dmas.
-
-  One of the DMA channels will be responsible for transmission (should be
-  named "tx") and one for reception (should be named "rx").
-
-Example:
-
-bcm2835_i2s: i2s@7e203000 {
-	compatible = "brcm,bcm2835-i2s";
-	reg = <0x7e203000 0x24>;
-	clocks = <&clocks BCM2835_CLOCK_PCM>;
-
-	dmas = <&dma 2>,
-	       <&dma 3>;
-	dma-names = "tx", "rx";
-};

Documentation/devicetree/bindings/sound/brcm,bcm2835-i2s.yaml

@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/brcm,bcm2835-i2s.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom BCM2835 SoC I2S/PCM module
+
+maintainers:
+  - Florian Fainelli <florian.fainelli@broadcom.com>
+
+properties:
+  compatible:
+    const: brcm,bcm2835-i2s
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  dmas:
+    items:
+      - description: Transmission DMA controller phandle and request line.
+      - description: Reception DMA controller phandle and request line.
+
+  dma-names:
+    items:
+      - const: tx
+      - const: rx
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - dmas
+  - dma-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/bcm2835.h>
+
+    i2s@7e203000 {
+        compatible = "brcm,bcm2835-i2s";
+        reg = <0x7e203000 0x24>;
+        clocks = <&clocks BCM2835_CLOCK_PCM>;
+        dmas = <&dma 2>, <&dma 3>;
+        dma-names = "tx", "rx";
+    };