dt-bindings: extcon: Add support for SM5502 MUIC device

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 <cw00.choi@samsung.com>

diff --git a/Documentation/devicetree/bindings/extcon/extcon-sm5502.txt b/Documentation/devicetree/bindings/extcon/extcon-sm5502.txt
new file mode 100644 (file)
index 0000000..4ecda22
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+++ 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>;
+       };