dts: arm: sifli: sf32lb52x： define mbox

Mbox is hardware interface between Application HCPU and Bluetooth LCPU.

Signed-off-by: ganghe <[email protected]>

Author: ganghe

dts/arm/sifli/sf32lb52x-ram012.dtsi

@@ -3,6 +3,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <arm/armv8-m.dtsi>
+#include <zephyr/dt-bindings/memory-attr/memory-attr-arm.h>
 #include <mem.h>
 
 / {
@@ -13,7 +15,23 @@
 	soc {
 		ram012: memory@20000000 {
 			compatible = "mmio-sram";
-			reg = <0x20000000 DT_SIZE_K(512)>;
-		};
+			reg = <0x20000000 DT_SIZE_K(511)>;
+		};       
+        sram0_shared: memory@2007fc00 {
+            /* Last 1 kB of sram0 */
+       		compatible = "zephyr,memory-region", "mmio-sram";
+            reg = <0x2007fc00 DT_SIZE_K(1)>;
+            device_type = "memory";
+            zephyr,memory-region = "sram0_shared";
+            zephyr,memory-attr = <(DT_MEM_ARM(ATTR_MPU_RAM_NOCACHE))>;
+        };
+        sram1_shared: memory@20400000 {
+            /* Last 1 kB of sram0 */
+       		compatible = "zephyr,memory-region", "mmio-sram";
+            reg = <0x20400000 DT_SIZE_K(64)>;
+            device_type = "memory";
+            zephyr,memory-region = "sram1_shared";
+            zephyr,memory-attr = <(DT_MEM_ARM(ATTR_MPU_RAM_NOCACHE))>;
+        };
 	};
 };

dts/arm/sifli/sf32lb52x.dtsi

@@ -117,6 +117,7 @@
 			status = "disabled";
 		};
 
+
 		dmac: dma-controller@50081000 {
 			compatible = "sifli,sf32lb-dmac";
 			reg = <0x50081000 0x1000>;
@@ -135,6 +136,19 @@
 			interrupts = <59 0>;
 			status = "disabled";
 		};
+        mbox: mbox@50082000 {
+            compatible = "sifli,bt-mbox";
+            reg = <0x50082000 0x1000>;
+            interrupts = <58 1>;
+            status = "okay";            
+        };        
+
+		usart1: serial@50084000 {
+			compatible = "sifli,sf32lb-usart";
+			reg = <0x50084000 0x400>;
+			interrupts = <59 0>;
+			status = "disabled";
+		};
 
 		gpioa: gpio@500a0000 {
 			compatible = "sifli,sf32lb-gpio-parent";

dts/bindings/bluetooth/sifli,bt-mbox.yaml

@@ -0,0 +1,16 @@
+# Mailbox Bluetooth HCI device
+
+description: Bluetooth HCI behind a mailbox IPC device (H:4)
+
+compatible: "sifli,bt-mbox"
+
+include: bt-hci.yaml
+
+properties:
+  bt-hci-name:
+    default: "mbox"
+  bt-hci-bus:
+    default: "virtual"
+        
+mbox-cells:
+  - channel