[PATCH 1/3] dt-bindings: gpio: add sama5d2 PIOBU support

[Andrei.Stefanescu]

This patch describes the compatible and the device tree
bindings necessary for the sama5d2 PIOBU GPIO
controller driver.

Signed-off-by: Andrei Stefanescu <andrei.stefanescu@xxxxxxxxxxxxx>
---
 .../bindings/gpio/gpio-sama5d2-piobu.txt           | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/gpio-sama5d2-piobu.txt

diff --git a/Documentation/devicetree/bindings/gpio/gpio-sama5d2-piobu.txt b/Documentation/devicetree/bindings/gpio/gpio-sama5d2-piobu.txt
new file mode 100644
index 0000000..791ac51
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-sama5d2-piobu.txt
@@ -0,0 +1,23 @@
+GPIO controller for SAMA5D2 PIOBU pins.
+
+This pins have the property of not losing their voltage
+during Backup/Self-refresh mode.
+
+These bindings should be set to a node in the dtsi file.
+
+Required properties:
+- compatible:		"syscon", "microchip,sama5d2-piobu"
+- #gpio-cells:		There are 2. The pin number is the
+			first, the second represents additional
+			parameters such as GPIO_ACTIVE_HIGH/LOW.
+- gpio-controller:	Marks the port as GPIO controller.
+
+Example:
+
+	secumod@fc040000 {
+		compatible = "syscon", "microchip,sama5d2-piobu";
+		reg = <0xfc040000 0x100>;
+
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
-- 
2.7.4