drivers: i2s: siwx91x: DTS changes for siwx91x I2S driver

1. Create a YAML file for I2S node
2. Add I2S node in the siwx917.dtsi

Signed-off-by: Sai Santhosh Malae <Santhosh.Malae@silabs.com>

Author: smalae

dts/arm/silabs/siwg917.dtsi

@@ -351,6 +351,33 @@
 			clocks = <&clock0 SIWX91X_CLK_GSPI>;
 			status = "disabled";
 		};
+
+		i2s0: i2s@47050000 {
+			compatible = "silabs,siwx91x-i2s";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x47050000 0x200>;
+			interrupts = <64 0>;
+			interrupt-names = "i2s0";
+			silabs,channel-group = <0>;
+			silabs,max-channel-count = <2>;
+			clocks = <&clock0 SIWX91X_CLK_I2S0>, <&clock0 SIWX91X_CLK_STATIC_I2S0>;
+			status = "disabled";
+		};
+
+		ulpi2s: i2s@24040400 {
+			compatible = "silabs,siwx91x-i2s";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x24040400 0x200>;
+			interrupts = <14 0>;
+			interrupt-names = "ulpi2s";
+			silabs,channel-group = <0>;
+			silabs,max-channel-count = <1>;
+			clocks = <&clock0 SIWX91X_CLK_ULP_I2S>,
+				 <&clock0 SIWX91X_CLK_STATIC_ULP_I2S>;
+			status = "disabled";
+		};
 	};
 };
 

dts/bindings/i2s/silabs,siwx91x-i2s.yaml

@@ -0,0 +1,29 @@
+description: Silabs siwx91x I2S (Inter-IC sound interface)
+
+compatible: "silabs,siwx91x-i2s"
+
+include: [i2s-controller.yaml, pinctrl-device.yaml]
+
+properties:
+  reg:
+    required: true
+
+  interrupts:
+    required: true
+
+  silabs,channel-group:
+    type: int
+    description: |
+        Each channel group within the I2S module consists of both transmit (TX) and
+        receive (RX) channels. The I2S0 interface supports two channel groups (0 and 1),
+        In contrast, the ULP_I2S interface is more constrained, offering only a single
+        channel group for its TX and RX operations.
+    required: true
+
+  silabs,max-channel-count:
+    type: int
+    description: |
+        Maximum channel count of I2S peripheral. "silabs,channel-group" attribute should
+        be always less than this value. This value is fixed for an instance
+        and not expected to change by user in any application overlay.
+    required: true