dts: arm/silabs: add dma node for efr32(mg2x/bg2x)

Update dts for efr32mg2x and efr32bg2x board that support silabs ldma

Signed-off-by: Martin Hoff <[email protected]>

Author: Martinhoff-maker

dts/arm/silabs/efr32bg22.dtsi

@@ -24,6 +24,10 @@
 	interrupts = <10 2 18 2>;
 };
 
+&dma0 {
+	interrupts = <21 0>;
+};
+
 &i2c0 {
 	interrupts = <27 0>;
 };

dts/arm/silabs/efr32bg27.dtsi

@@ -51,3 +51,7 @@
 &adc0 {
 	interrupts = <54 0>;
 };
+
+&dma0 {
+	interrupts = <26 0>;
+};

dts/arm/silabs/efr32bg2x.dtsi

@@ -208,6 +208,14 @@
 
 		};
 
+		dma0: dma@40040000{
+			compatible = "silabs,ldma";
+			reg = <0x40040000 0x4000>;
+			#dma-cells = <3>;
+			dma_channels = <8>;
+			status = "disabled";
+		};
+
 		wdog0: wdog@4a018000 {
 			compatible = "silabs,gecko-wdog";
 			reg = <0x4A018000 0x3028>;

dts/arm/silabs/efr32mg21.dtsi

@@ -166,6 +166,15 @@
 			status = "okay";
 		};
 
+		dma0: dma@40040000{
+			compatible = "silabs,ldma";
+			reg = <0x40040000 0x4000>;
+			interrupts = <21 0>;
+			#dma-cells = <3>;
+			dma_channels = <8>;
+			status = "disabled";
+		};
+
 		wdog0: wdog@5a018000 {
 			compatible = "silabs,gecko-wdog";
 			reg = <0x5a018000 0x2C>;

dts/arm/silabs/efr32mg24.dtsi

@@ -189,6 +189,15 @@
 			};
 		};
 
+		dma0: dma@40040000 {
+			compatible = "silabs,ldma";
+			reg = <0x40040000 0x4000>;
+			interrupts = <21 0>;
+			#dma-cells = <3>;
+			dma_channels = <8>;
+			status = "disabled";
+		};
+
 		wdog0: wdog@5b004000 {
 			compatible = "silabs,gecko-wdog";
 			reg = <0x5b004000 0x2C>;

dts/bindings/dma/silabs,ldma.yaml

@@ -0,0 +1,26 @@
+# Copyright (c) 2024 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+  Silabs LDMA controller
+
+  The Silabs LDMA is a general-purpose direct memory access controller
+  capable of supporting 8 independent DMA channels. It supports specific
+  functions like scatter-gather.
+
+  It is present on silabs radio board devices like EFR32xG21
+
+compatible: "silabs,ldma"
+
+include: dma-controller.yaml
+
+properties:
+  reg:
+    required: true
+
+  interrupts:
+    required: true
+
+  dma_channels:
+    type: int
+    required: true