[PATCH 1/3] dt-bindings: gpio: Add binding documentation for gpio-thunderx

[David Daney <ddaney.cavm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

From: David Daney <david.daney-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>

Signed-off-by: David Daney <david.daney-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
---
 .../devicetree/bindings/gpio/gpio-thunderx.txt     | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/gpio-thunderx.txt

diff --git a/Documentation/devicetree/bindings/gpio/gpio-thunderx.txt b/Documentation/devicetree/bindings/gpio/gpio-thunderx.txt
new file mode 100644
index 0000000..ba3cdae
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-thunderx.txt
@@ -0,0 +1,33 @@
+Cavium ThunderX/OCTEON-TX GPIO controller bindings
+
+Required Properties:
+- reg: The controller bus address.
+- gpio-controller: Marks the device node as a GPIO controller.
+- #gpio-cells: Must be 2.
+  - First cell is the GPIO pin number relative to the controller.
+  - Second cell is standard of_gpio_flags:
+     1 - Active Low.
+     2 - Single Ended.
+
+Optional Properties:
+- compatible: "cavium,thunder-8890-gpio", unused as PCI driver binding is used.
+- interrupt-controller: Marks the device node as an interrupt controller.
+- #interrupt-cells: Must be present and have value of 2 if
+                    "interrupt-controller" is present.
+  - First cell is the GPIO pin number relative to the controller.
+  - Second cell is triggering flags, one of:
+    1 - Edge Rising
+    2 - Edge Falling
+    4 - Level High
+    8 - Level Low
+
+Example:
+
+gpio_6_0: gpio0@6,0 {
+	compatible = "cavium,thunder-8890-gpio";
+	reg = <0x3000 0 0 0 0>; /*  DEVFN = 0x30 (6:0) */
+	gpio-controller;
+	#gpio-cells = <2>;
+	interrupt-controller;
+	#interrupt-cells = <2>;
+};
-- 
1.8.3.1

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