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diff --git a/Documentation/devicetree/bindings/gpio/gpio-xgene-sb.txt b/Documentation/devicetree/bindings/gpio/gpio-xgene-sb.txt
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+APM X-Gene Standby GPIO controller bindings
+
+This is a gpio controller in the standby domain. It also supports interrupt in
+some particular pins which are sourced to its parent interrupt controller
+as diagram below:
+                            +-----------------+
+                            | X-Gene standby  |
+                            | GPIO controller +------ GPIO_0
++------------+              |                 | ...
+| Parent IRQ | EXT_INT_0    |                 +------ GPIO_8/EXT_INT_0
+| controller | (SPI40)      |                 | ...
+| (GICv2)    +--------------+                 +------ GPIO_[N+8]/EXT_INT_N
+|            |   ...        |                 |
+|            | EXT_INT_N    |                 +------ GPIO_[N+9]
+|            | (SPI[40 + N])|                 | ...
+|            +--------------+                 +------ GPIO_MAX
++------------+              +-----------------+
+
+Required properties:
+- compatible: "apm,xgene-gpio-sb" for the X-Gene Standby GPIO controller
+- reg: Physical base address and size of the controller's registers
+- #gpio-cells: Should be two.
+	- first cell is the pin number
+	- second cell is used to specify the gpio polarity:
+		0 = active high
+		1 = active low
+- gpio-controller: Marks the device node as a GPIO controller.
+- interrupts: The EXT_INT_0 parent interrupt resource must be listed first.
+- interrupt-cells: Should be two.
+       - first cell is 0-N coresponding for EXT_INT_0 to EXT_INT_N.
+       - second cell is used to specify flags.
+- interrupt-controller: Marks the device node as an interrupt controller.
+- apm,nr-gpios: Optional, specify number of gpios pin.
+- apm,nr-irqs: Optional, specify number of interrupt pins.
+- apm,irq-start: Optional, specify lowest gpio pin support interrupt.
+
+Example:
+	sbgpio: gpio@17001000{
+		compatible = "apm,xgene-gpio-sb";
+		reg = <0x0 0x17001000 0x0 0x400>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = 	<0x0 0x28 0x1>,
+				<0x0 0x29 0x1>,
+				<0x0 0x2a 0x1>,
+				<0x0 0x2b 0x1>,
+				<0x0 0x2c 0x1>,
+				<0x0 0x2d 0x1>;
+		interrupt-parent = <&gic>;
+		#interrupt-cells = <2>;
+		interrupt-controller;
+		apm,nr-gpios = <22>;
+		apm,nr-irqs = <6>;
+		apm,irq-start = <8>;
+	};
+
+	testuser {
+		compatible = "example,testuser";
+		/* Use the GPIO_13/EXT_INT_5 line as an active high triggered
+		 * level interrupt
+		 */
+		interrupts = <5 4>;
+		interrupt-parent = <&sbgpio>;
+	};