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diff --git a/Documentation/devicetree/bindings/arm/rockchip/smp-sram.txt b/Documentation/devicetree/bindings/arm/rockchip/smp-sram.txt
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+Rockchip SRAM for smp bringup:
+------------------------------
+
+Rockchip's smp-capable SoCs use the first part of the sram for the bringup
+of the cores. Once the core gets powered up it executes the code that is
+residing at the very beginning of the sram.
+
+Therefore a reserved section sub-node has to be added to the mmio-sram
+declaration.
+
+Required sub-node properties:
+- compatible : should be "rockchip,rk3066-smp-sram"
+
+The rest of the properties should follow the generic mmio-sram discription
+found in ../../misc/sram.txt
+
+Example:
+
+	sram: sram@10080000 {
+		compatible = "mmio-sram";
+		reg = <0x10080000 0x10000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		smp-sram@10080000 {
+			compatible = "rockchip,rk3066-smp-sram";
+			reg = <0x10080000 0x50>;
+		};
+	};