This patch describes the compatible and the device tree
bindings necessary for the SAMA5D2 PIOBU GPIO.
Signed-off-by: Andrei Stefanescu <andrei.stefanescu@xxxxxxxxxxxxx>
---
.../bindings/gpio/gpio-sama5d2-piobu.txt | 31 ++++++++++++++++++++++
1 file changed, 31 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..2e260e1
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-sama5d2-piobu.txt
@@ -0,0 +1,31 @@
+GPIO controller for SAMA5D2 PIOBU pins.
+
+These 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.
+
+Note that the driver uses syscon and should be the child of
+the syscon node.
+
+Example:
+
+ secumod@fc040000 {
+ compatible = "atmel,sama5d2-secumod", "syscon", "simple-mfd";
+ status = "okay";
+ reg = <0xfc040000 0x100>;
+
+ pioBU: piobu {
+ status = "okay";
+ compatible = "microchip,sama5d2-piobu";
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+ };
--
2.7.4
