diff --git a/Documentation/devicetree/bindings/pinctrl/aspeed,ast2500-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/aspeed,ast2500-pinctrl.yaml
index ef8499a0aba4..35bd0e1eadae 100644
--- a/Documentation/devicetree/bindings/pinctrl/aspeed,ast2500-pinctrl.yaml
+++ b/Documentation/devicetree/bindings/pinctrl/aspeed,ast2500-pinctrl.yaml
@@ -171,6 +171,7 @@ additionalProperties:
         - SD2
         - SDA1
         - SDA2
+        - SGPM
         - SGPS1
         - SGPS2
         - SIOONCTRL