diff --git a/boards/arm/efr32_radio/efr32_radio_brd4187c.dts b/boards/arm/efr32_radio/efr32_radio_brd4187c.dts
index 57d30776189..1f065fb15b1 100644
--- a/boards/arm/efr32_radio/efr32_radio_brd4187c.dts
+++ b/boards/arm/efr32_radio/efr32_radio_brd4187c.dts
@@ -61,6 +61,10 @@
 	clock-frequency = <39000000>;
 };
 
+&pstate_em3 {
+	status = "disabled";
+};
+
 &usart0 {
 	current-speed = <115200>;
 	location-rx = <GECKO_LOCATION(0) GECKO_PORT_A GECKO_PIN(9)>;
diff --git a/dts/arm/silabs/efr32mg24.dtsi b/dts/arm/silabs/efr32mg24.dtsi
index aec5fbd26c6..1ee015b7334 100644
--- a/dts/arm/silabs/efr32mg24.dtsi
+++ b/dts/arm/silabs/efr32mg24.dtsi
@@ -25,15 +25,44 @@
 			device_type = "cpu";
 			compatible = "arm,cortex-m33";
 			reg = <0>;
-			cpu-power-states = <&state0>;
+			cpu-power-states = <&pstate_em1 &pstate_em2 &pstate_em3>;
 		};
 
 		power-states {
-			state0: state0 {
+			/*
+			 * EM1 is a basic "CPU WFI idle", all high-freq clocks remain
+			 * enabled.
+			 */
+			pstate_em1: em1 {
+				compatible = "zephyr,power-state";
+				power-state-name = "runtime-idle";
+				min-residency-us = <4>;
+				/* HFXO remains active */
+				exit-latency-us = <2>;
+			};
+
+			/*
+			 * EM2 is a deepsleep with HF clocks disabled by HW, voltages
+			 * scaled down, etc.
+			 */
+			pstate_em2: em2 {
+				compatible = "zephyr,power-state";
+				power-state-name = "suspend-to-idle";
+				min-residency-us = <260>;
+				exit-latency-us = <250>;
+			};
+
+			/*
+			 * EM3 seems to be exactly the same as EM2 except that
+			 * LFXO & LFRCO should be disabled, so you must use ULFRCO
+			 * as BURTC clock for the system to not lose track of time and
+			 * wake up.
+			 */
+			pstate_em3: em3 {
 				compatible = "zephyr,power-state";
 				power-state-name = "standby";
-				min-residency-us = <50000>;
-				exit-latency-us = <0>;
+				min-residency-us = <20000>;
+				exit-latency-us = <2000>;
 			};
 		};
 	};
diff --git a/soc/arm/silabs_exx32/efr32mg24/Kconfig.defconfig.series b/soc/arm/silabs_exx32/efr32mg24/Kconfig.defconfig.series
index b8ac2ad4bc3..ec3e460c355 100644
--- a/soc/arm/silabs_exx32/efr32mg24/Kconfig.defconfig.series
+++ b/soc/arm/silabs_exx32/efr32mg24/Kconfig.defconfig.series
@@ -19,6 +19,7 @@ config NUM_IRQS
 config PM
 	default n
 	select COUNTER
+	select UART_INTERRUPT_DRIVEN if SERIAL_SUPPORT_INTERRUPT
 
 choice PM_POLICY
 	default PM_POLICY_DEFAULT