This patch add documentation for binding of SM5502 MUIC (Micro-USB Interface
Controller) device which is using EXTCON subsystem. The SM5502 MUIC device
can detect various external accessories when external accessories is attached
or detached.

Signed-off-by: Chanwoo Choi <redacted>
Cc: Rob Herring <redacted>
Cc: Pawel Moll <redacted>
Cc: Mark Rutland <redacted>
Cc: Ian Campbell <redacted>
Cc: Kumar Gala <redacted>
Cc: Randy Dunlap <redacted>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

---
 .../devicetree/bindings/extcon/extcon-sm5502.txt   | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/extcon/extcon-sm5502.txt

diff --git a/Documentation/devicetree/bindings/extcon/extcon-sm5502.txt b/Documentation/devicetree/bindings/extcon/extcon-sm5502.txt
new file mode 100644
index 0000000..4ecda22
--- /dev/null
+++ b/Documentation/devicetree/bindings/extcon/extcon-sm5502.txt

@@ -0,0 +1,23 @@
+
+* SM5502 MUIC (Micro-USB Interface Controller) device
+
+The Silicon Mitus SM5502 is a MUIC (Micro-USB Interface Controller) device
+which can detect the state of external accessory when external accessory is
+attached or detached and button is pressed or released. It is interfaced to
+the host controller using an I2C interface.
+
+Required properties:
+- compatible: Should be "siliconmitus,sm5502-muic"
+- reg: Specifies the I2C slave address of the MUIC block. It should be 0x25
+- interrupt-parent: Specifies the phandle of the interrupt controller to which
+  the interrupts from sm5502 are delivered to.
+- interrupts: Interrupt specifiers for detection interrupt sources.
+
+Example:
+
+	sm5502@25 {
+		compatible = "siliconmitus,sm5502-muic";
+		interrupt-parent = <&gpx1>;
+		interrupts = <5 0>;
+		reg = <0x25>;
+	};