diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 577ef34..5b54651 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -733,6 +733,11 @@
 			#address-cells = <1>;
 			#size-cells = <0>;
 
+			pwrdom_scmi: protocol@11 {
+				reg = <0x11>;
+				#power-domain-cells = <1>;
+			};
+
 			clk_scmi: protocol@14 {
 				reg = <0x14>;
 				#clock-cells = <1>;
@@ -1647,6 +1652,7 @@
 
 	sandbox_scmi {
 		compatible = "sandbox,scmi-devices";
+		power-domains = <&pwrdom_scmi 2>;
 		clocks = <&clk_scmi 2>, <&clk_scmi 0>;
 		resets = <&reset_scmi 3>;
 		regul0-supply = <&regul0_scmi>;
diff --git a/arch/sandbox/include/asm/scmi_test.h b/arch/sandbox/include/asm/scmi_test.h
index ccb0df6..619f8f5 100644
--- a/arch/sandbox/include/asm/scmi_test.h
+++ b/arch/sandbox/include/asm/scmi_test.h
@@ -6,11 +6,23 @@
 #ifndef __SANDBOX_SCMI_TEST_H
 #define __SANDBOX_SCMI_TEST_H
 
+#include <power-domain.h>
+
 struct udevice;
 struct sandbox_scmi_agent;
 struct sandbox_scmi_service;
 
 /**
+ * struct sandbox_scmi_pwd
+ * @id:		Identifier of the power domain used in the SCMI protocol
+ * @pstate::	Power state of the domain
+ */
+struct sandbox_scmi_pwd {
+	uint id;
+	u32 pstate;
+};
+
+/**
  * struct sandbox_scmi_clk - Simulated clock exposed by SCMI
  * @id:		Identifier of the clock used in the SCMI protocol
  * @enabled:	Clock state: true if enabled, false if disabled
@@ -45,6 +57,8 @@
 
 /**
  * struct sandbox_scmi_agent - Simulated SCMI service seen by SCMI agent
+ * @pwdom_version: Implemented power domain protocol version
+ * @pwdom_count:   Simulated power domains array size
  * @clk:	Simulated clocks
  * @clk_count:	Simulated clocks array size
  * @reset:	Simulated reset domains
@@ -53,6 +67,9 @@
  * @voltd_count: Simulated voltage domains array size
  */
 struct sandbox_scmi_agent {
+	int pwdom_version;
+	struct sandbox_scmi_pwd *pwdom;
+	size_t pwdom_count;
 	struct sandbox_scmi_clk *clk;
 	size_t clk_count;
 	struct sandbox_scmi_reset *reset;
@@ -71,6 +88,8 @@
 
 /**
  * struct sandbox_scmi_devices - Reference to devices probed through SCMI
+ * @pwdom:		Array of power domains
+ * @pwdom_count:	Number of power domains probed
  * @clk:		Array the clock devices
  * @clk_count:		Number of clock devices probed
  * @reset:		Array the reset controller devices
@@ -79,6 +98,8 @@
  * @regul_count:	Number of regulator devices probed
  */
 struct sandbox_scmi_devices {
+	struct power_domain *pwdom;
+	size_t pwdom_count;
 	struct clk *clk;
 	size_t clk_count;
 	struct reset_ctl *reset;