dts: arm: st: h7: add definition for backup SRAM

Add DT definition for the backup SRAM.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

dts/arm/st/h7/stm32h7.dtsi

@@ -726,6 +726,14 @@
 				status = "disabled";
 			};
 		};
+
+		backup_sram: memory@38800000 {
+			compatible = "st,stm32-backup-sram";
+			reg = <0x38800000 DT_SIZE_K(4)>;
+			clocks = <&rcc STM32_CLOCK_BUS_AHB4 0x10000000>;
+			label = "BACKUP_SRAM";
+			status = "disabled";
+		};
 	};
 };