Describe gpio-mt7621 binding.
Signed-off-by: John Crispin <blogic@xxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-gpio@xxxxxxxxxxxxxxx
---
.../devicetree/bindings/gpio/gpio-mt7621.txt | 45 ++++++++++++++++++++
1 file changed, 45 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-mt7621.txt
diff --git a/Documentation/devicetree/bindings/gpio/gpio-mt7621.txt b/Documentation/devicetree/bindings/gpio/gpio-mt7621.txt
new file mode 100644
index 0000000..ade0efe
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-mt7621.txt
@@ -0,0 +1,45 @@
+Mediatek SoC GPIO controller bindings
+
+The IP core used inside these SoCs has 1-N banks of 32 GPIOs each. Unfortunately
+the registers of all the banks are interwoven inside one single IO range. We
+really want to load one GPIO controller instance per bank. to make this possible
+we support 2 types of nodes. The parent node defines the memory I/O range and
+has N children each describing a single bank.
+
+Required properties for the top level node:
+- compatible:
+ - "mediatek,mt7621-gpio" for Mediatek controllers
+- reg : Physical base address and length of the controller's registers
+
+Required properties for the GPIO bank node:
+- compatible:
+ - "mediatek,mt7621-gpio-bank" for Mediatek banks
+- #gpio-cells : Should be two.
+ - first cell is the pin number
+ - second cell is used to specify optional parameters (unused)
+- gpio-controller : Marks the device node as a GPIO controller
+- reg : The id of the bank that the node describes.
+
+
+Example:
+ gpio@600 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ compatible = "mediatek,mt7621-gpio";
+ reg = <0x600 0x100>;
+
+ gpio0: bank@0 {
+ reg = <0>;
+ compatible = "mediatek,mt7621-gpio-bank";
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpio1: bank@1 {
+ reg = <1>;
+ compatible = "mediatek,mt7621-gpio-bank";
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+ };
--
1.7.10.4
