dts: arm: st: wb0: add TRNG node

Add Device Tree nodes corresponding to TRNG of STM32WB0 series SoCs.

Signed-off-by: Mathieu Choplain <[email protected]>

Author: Mathieu Choplain

dts/arm/st/wb0/stm32wb0.dtsi

@@ -259,6 +259,22 @@
 			dma-requests= <25>;
 			status = "disabled";
 		};
+
+		/**
+		 * This node is valid for STM32WB05, STM32WB06 and
+		 * STM32WB07, all equipped with the same IRQ-less
+		 * TRNG instance. Since all those properties are
+		 * also valid on STM32SWB09, except "compatible",
+		 * we pretend this node is valid for all SoCs of
+		 * the series and clean up in `stm32wb09.dtsi`.
+		 */
+		rng: rng@48600000 {
+			compatible = "st,stm32-rng-noirq";
+			reg = <0x48600000 DT_SIZE_K(4)>;
+			clocks = <&rcc STM32_CLOCK(AHB0, 18)>;
+			generation-delay-ns = <1250>; /* 1.25us */
+			status = "disabled";
+		};
 	};
 
 	bt_hci_wb0: bt_hci_wb0 {

dts/arm/st/wb0/stm32wb09.dtsi

@@ -14,5 +14,17 @@
 / {
 	soc {
 		compatible = "st,stm32wb09", "st,stm32wb0", "simple-bus";
+
+		rng: rng@48600000 {
+			/**
+			 * STM32WB09 TRNG has an interrupt line.
+			 * Switch to proper compatible, delete property
+			 * that doesn't apply to it, and add the interrupt
+			 * line as property.
+			 */
+			/delete-property/ generation-delay-ns;
+			compatible = "st,stm32-rng";
+			interrupts = <28 0>;
+		};
 	};
 };