diff --git a/include/hardware/hwcomposer2.h b/include/hardware/hwcomposer2.h
index ba17ec5..e545e24 100644
--- a/include/hardware/hwcomposer2.h
+++ b/include/hardware/hwcomposer2.h
@@ -306,6 +306,7 @@
     HWC2_FUNCTION_SET_AUTO_LOW_LATENCY_MODE,
     HWC2_FUNCTION_GET_SUPPORTED_CONTENT_TYPES,
     HWC2_FUNCTION_SET_CONTENT_TYPE,
+    HWC2_FUNCTION_GET_CLIENT_TARGET_PROPERTY,
 } hwc2_function_descriptor_t;
 
 /* Layer requests returned from getDisplayRequests */
@@ -665,6 +666,7 @@
         case HWC2_FUNCTION_SET_AUTO_LOW_LATENCY_MODE: return "SetAutoLowLatencyMode";
         case HWC2_FUNCTION_GET_SUPPORTED_CONTENT_TYPES: return "GetSupportedContentTypes";
         case HWC2_FUNCTION_SET_CONTENT_TYPE: return "SetContentType";
+        case HWC2_FUNCTION_GET_CLIENT_TARGET_PROPERTY: return "GetClientTargetProperty";
 
         default: return "Unknown";
     }
@@ -942,6 +944,7 @@
     SetAutoLowLatencyMode = HWC2_FUNCTION_SET_AUTO_LOW_LATENCY_MODE,
     GetSupportedContentTypes = HWC2_FUNCTION_GET_SUPPORTED_CONTENT_TYPES,
     SetContentType = HWC2_FUNCTION_SET_CONTENT_TYPE,
+    GetClientTargetProperty = HWC2_FUNCTION_GET_CLIENT_TARGET_PROPERTY,
 };
 TO_STRING(hwc2_function_descriptor_t, FunctionDescriptor,
         getFunctionDescriptorName)
@@ -3036,6 +3039,35 @@
 typedef int32_t /*hwc_error_t*/ (*HWC2_PFN_SET_CONTENT_TYPE)(hwc2_device_t* device,
         hwc2_display_t display, int32_t /* hwc2_content_type_t */ contentType);
 
+/* getClientTargetProperty(..., outClientTargetProperty)
+ * Descriptor: HWC2_FUNCTION_GET_CLIENT_TARGET_PROPERTY
+ * Optional for HWC2 devices
+ *
+ * Retrieves the client target properties for which the hardware composer
+ * requests after the last call to validateDisplay. The client must set the
+ * properties of the client target to match the returned values.
+ * When this API is implemented, if client composition is needed, the hardware
+ * composer must return meaningful client target property with dataspace not
+ * setting to UNKNOWN.
+ * When the returned dataspace is set to UNKNOWN, it means hardware composer
+ * requests nothing, the client must ignore the returned client target property
+ * structrue.
+ *
+ * Parameters:
+ *   outClientTargetProperty - the client target properties that hardware
+ *       composer requests. If dataspace field is set to UNKNOWN, it means
+ *       the hardware composer requests nothing, the client must ignore the
+ *       returned client target property structure.
+ *
+ * Returns HWC2_ERROR_NONE or one of the following errors:
+ *   HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
+ *   HWC2_ERROR_NOT_VALIDATED - validateDisplay has not been called for this
+ *       display
+ */
+typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_CLIENT_TARGET_PROPERTY)(
+        hwc2_device_t* device, hwc2_display_t display,
+        hwc_client_target_property_t* outClientTargetProperty);
+
 __END_DECLS
 
 #endif
diff --git a/include/hardware/hwcomposer_defs.h b/include/hardware/hwcomposer_defs.h
index db81c51..3823765 100644
--- a/include/hardware/hwcomposer_defs.h
+++ b/include/hardware/hwcomposer_defs.h
@@ -104,6 +104,39 @@
     HWC_TRANSFORM_FLIP_V_ROT_90 = HAL_TRANSFORM_FLIP_V | HAL_TRANSFORM_ROT_90,
 } hwc_transform_t;
 
+/* Constraints for changing vsync period */
+typedef struct hwc_vsync_period_change_constraints {
+    /* Time in CLOCK_MONOTONIC after which the vsync period may change
+     * (i.e., the vsync period must not change before this time). */
+    int64_t desiredTimeNanos;
+    /*
+     * If true, requires that the vsync period change must happen seamlessly without
+     * a noticeable visual artifact. */
+    uint8_t seamlessRequired;
+} hwc_vsync_period_change_constraints_t;
+
+/* Timing for a vsync period change. */
+typedef struct hwc_vsync_period_change_timeline {
+    /* The time in CLOCK_MONOTONIC when the new display will start to refresh at
+     * the new vsync period. */
+    int64_t newVsyncAppliedTimeNanos;
+
+    /* Set to true if the client is required to sent a frame to be displayed before
+     * the change can take place. */
+    uint8_t refreshRequired;
+
+    /* The time in CLOCK_MONOTONIC when the client is expected to send the new frame.
+     * Should be ignored if refreshRequired is false. */
+    int64_t refreshTimeNanos;
+} hwc_vsync_period_change_timeline_t;
+
+typedef struct hwc_client_target_property {
+    // The pixel format of client target requested by hardware composer.
+    int32_t pixelFormat;
+    // The dataspace of the client target requested by hardware composer.
+    int32_t dataspace;
+} hwc_client_target_property_t;
+
 /*******************************************************************************
  * Beyond this point are things only used by HWC1, which should be ignored when
  * implementing a HWC2 device
@@ -304,32 +337,6 @@
     HWC_POWER_MODE_DOZE_SUSPEND  = 3,
 };
 
-/* Constraints for changing vsync period */
-typedef struct hwc_vsync_period_change_constraints {
-    /* Time in CLOCK_MONOTONIC after which the vsync period may change
-     * (i.e., the vsync period must not change before this time). */
-    int64_t desiredTimeNanos;
-    /*
-     * If true, requires that the vsync period change must happen seamlessly without
-     * a noticeable visual artifact. */
-    uint8_t seamlessRequired;
-} hwc_vsync_period_change_constraints_t;
-
-/* Timing for a vsync period change. */
-typedef struct hwc_vsync_period_change_timeline {
-    /* The time in CLOCK_MONOTONIC when the new display will start to refresh at
-     * the new vsync period. */
-    int64_t newVsyncAppliedTimeNanos;
-
-    /* Set to true if the client is required to sent a frame to be displayed before
-     * the change can take place. */
-    uint8_t refreshRequired;
-
-    /* The time in CLOCK_MONOTONIC when the client is expected to send the new frame.
-     * Should be ignored if refreshRequired is false. */
-    int64_t refreshTimeNanos;
-} hwc_vsync_period_change_timeline_t;
-
 /*****************************************************************************/
 
 __END_DECLS