diff --git a/Documentation/devicetree/bindings/arm/rockchip.txt b/Documentation/devicetree/bindings/arm/rockchip.txt
index 6809e4e51ed29bc6eda1a772b91d576aeb0cfeb0..60d4a1e0a9b589011b956ad674bb7955dbf2f19b 100644
--- a/Documentation/devicetree/bindings/arm/rockchip.txt
+++ b/Documentation/devicetree/bindings/arm/rockchip.txt
@@ -22,3 +22,7 @@ Rockchip platforms device tree bindings
       - compatible = "firefly,firefly-rk3288", "rockchip,rk3288";
     or
       - compatible = "firefly,firefly-rk3288-beta", "rockchip,rk3288";
+
+- ChipSPARK PopMetal-RK3288 board:
+    Required root node properties:
+      - compatible = "chipspark,popmetal-rk3288", "rockchip,rk3288";