boards: b_u585i_iot02a: Provide PM configuration

Provide configuration for "suspend to idle" states
for b_u585i_iot02a target.

Signed-off-by: Erwan Gouriou <[email protected]>

Author: erwango

boards/arm/b_u585i_iot02a/Kconfig.defconfig

@@ -12,4 +12,9 @@ config SPI_STM32_INTERRUPT
 	default y
 	depends on SPI
 
+choice STM32_LPTIM_CLOCK
+	default STM32_LPTIM_CLOCK_LSE
+	depends on STM32_LPTIM_TIMER
+endchoice
+
 endif # BOARD_B_U585I_IOT02A

boards/arm/b_u585i_iot02a/b_u585i_iot02a-common.dtsi

@@ -28,6 +28,27 @@
 			gpios = <&gpioc 13 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
 		};
 	};
+
+	power-states {
+		stop0: state0 {
+			compatible = "zephyr,power-state";
+			power-state-name = "suspend-to-idle";
+			substate-id = <1>;
+			min-residency-us = <100>;
+		};
+		stop1: state1 {
+			compatible = "zephyr,power-state";
+			power-state-name = "suspend-to-idle";
+			substate-id = <2>;
+			min-residency-us = <500>;
+		};
+		stop2: state2 {
+			compatible = "zephyr,power-state";
+			power-state-name = "suspend-to-idle";
+			substate-id = <3>;
+			min-residency-us = <900>;
+		};
+	};
 };
 
 &clk_lse {

boards/arm/b_u585i_iot02a/b_u585i_iot02a.dts

@@ -25,6 +25,14 @@
 	};
 };
 
+&cpu0 {
+	cpu-power-states = <&stop0 &stop1 &stop2>;
+};
+
+&lptim1 {
+	status = "okay";
+};
+
 &usart1 {
 	pinctrl-0 = <&usart1_tx_pa9 &usart1_rx_pa10>;
 	current-speed = <115200>;