dts: arm: st: f2: 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/f2/stm32f2.dtsi

@@ -276,6 +276,14 @@
 			label = "DAC_1";
 			#io-channel-cells = <1>;
 		};
+
+		backup_sram: memory@40024000 {
+			compatible = "st,stm32-backup-sram";
+			reg = <0x40024000 DT_SIZE_K(4)>;
+			clocks = <&rcc STM32_CLOCK_BUS_AHB1 0x00040000>;
+			label = "BACKUP_SRAM";
+			status = "disabled";
+		};
 	};
 
 	otgfs_phy: otgfs_phy {