dt-bindings: gpio: Add binding documentation for gpio-thunderx

Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
David Daney 2017-02-28 17:48:50 -08:00 committed by Linus Walleij
parent eddeae0737
commit f73b15487a

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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 a standard generic flag bitfield as described in gpio.txt.
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 as defined in interrupts.txt.
Example:
gpio_6_0: gpio@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>;
};