[PATCH V1 2/2] gpio: inverter: document the inverter bindings

[Harish Jenny K N <harish_kandiga@xxxxxxxxxx>]

Document the device tree binding for the virtual gpio
controller to configure the polarity of the gpio pins
used by the userspace.

Signed-off-by: Harish Jenny K N <harish_kandiga@xxxxxxxxxx>
---
 .../devicetree/bindings/gpio/gpio-inverter.txt     | 30 ++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/gpio-inverter.txt

diff --git a/Documentation/devicetree/bindings/gpio/gpio-inverter.txt b/Documentation/devicetree/bindings/gpio/gpio-inverter.txt
new file mode 100644
index 0000000..4411f83
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-inverter.txt
@@ -0,0 +1,30 @@
+GPIO-INVERTER
+======
+This binding defines the gpio-inverter. The gpio-inverter is a driver that
+allows to properly describe the gpio polarities on the hardware for those gpio
+pins which are used only from userspace
+
+Please refer to gpio.txt for generic information regarding GPIO bindings.
+
+Required properties:
+- compatible : "gpio-inverter".
+- gpio-controller: Marks the port as GPIO controller.
+- #gpio-cells: Two. The first cell is the pin number and
+   the second cell is used to specify the gpio polarity as defined in
+   defined in <dt-bindings/gpio/gpio.h>:
+      0 = GPIO_ACTIVE_HIGH
+      1 = GPIO_ACTIVE_LOW
+- mapped-gpios: Array of GPIO pins required from userspace, whose polarity has
+  to be configured in the driver.
+- gpio-line-names: This is an array of strings defining the names for the
+  mapped-gpios correspondingly. Name should be defined for each gpio pin.
+
+Example:
+
+gpio_inv: gpio-inv {
+	compatible = "gpio-inverter";
+	gpio-controller;
+	#gpio-cell = <2>;
+	mapped-gpios = <&gpio5 24 1>, <&gpio7 0 1>, <&gpio7 1 1>;
+	gpio-line-names = "JTAG_DNL_EN", "lvds-pwrdwn", "lcd-on";
+};
--
2.7.4