gpio: pl061: add new property for gpio base

If gpio base number isn't specified, the gpio base will be find from
the end of gpio number. In order to keep with schematics, add a new
property "linux,gpio-base" to specify the gpio number in DTS file.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/gpio/gpio-pl061.txt b/Documentation/devicetree/bindings/gpio/gpio-pl061.txt
new file mode 100644
index 00000000000..687206727bd
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-pl061.txt
@@ -0,0 +1,33 @@
+PL061 GPIO controller bindings
+
+Required properties:
+- compatible:
+  - "arm,pl061", "arm,primecell".
+- #gpio-cells : Should be two.
+  - first cell is the gpio pin number
+  - second cell is used to specify the gpio polarity:
+      0 = active high
+      1 = active low
+- gpio-controller : Marks the device node as a GPIO controller.
+- interrupt-controller : Marks the device node as an interrupt controller.
+- #interrupt-cells : Should be two.
+  - first cell is the hw irq number
+  - second cell is used to specify the interrupt type:
+      0 = default, unspecified type
+      1 = rising edge triggered
+      2 = falling edge triggered
+      4 = high level triggered
+      8 = low level triggered
+- linux,gpio-base : Should be the global GPIO number.
+
+Example:
+	gpio0: gpio@fc806000 {
+		compatible = "arm,pl061", "arm,primecell";
+		reg = <0xfc806000 0x1000>;
+		interrupts = <0 64 0x4>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		linux,gpio-base = <0>;
+	};