[PATCH V4 2/2] gpio: inverter: document the inverter bindings

[Harish Jenny K N <harish_kandiga@mentor.com>]

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

Signed-off-by: Harish Jenny K N <harish_kandiga@mentor.com>
---
 .../devicetree/bindings/gpio/gpio-inverter.txt     | 29 ++++++++++++++++++++++
 1 file changed, 29 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..8bb6b2e
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-inverter.txt
@@ -0,0 +1,29 @@
+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.
+
+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: One. This is the pin number.
+- inverted-gpios: Array of GPIO pins required from consumers, whose polarity
+  has to be inverted in the driver.
+Note: gpio flag should be set as GPIO_ACTIVE_HIGH. Using GPIO_ACTICE_LOW will
+cause double inversion.
+
+Optional properties:
+- gpio-line-names: Refer to gpio.txt for details regarding this property.
+
+Example:
+
+gpio_inv: gpio-inv {
+	compatible = "gpio-inverter";
+	gpio-controller;
+	#gpio-cells = <1>;
+	inverted-gpios = <&gpio5 24 GPIO_ACTIVE_HIGH>,
+	<&gpio7 0 GPIO_ACTIVE_HIGH>, <&gpio7 1 GPIO_ACTIVE_HIGH>;
+	gpio-line-names = "JTAG_DNL_EN", "lvds-pwrdwn", "lcd-on";
+};
--
2.7.4