mirror of
https://github.com/torvalds/linux.git
synced 2024-12-25 20:32:22 +00:00
5b64250b61
This patch adds the device tree bindings for the Western Digital's MyBook Live memory-mapped GPIO controllers. The gpios will be supported by gpio-mmio code of the GPIO generic library. Signed-off-by: Christian Lamparter <chunkeey@googlemail.com> Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
39 lines
1.1 KiB
Plaintext
39 lines
1.1 KiB
Plaintext
Bindings for the Western Digital's MyBook Live memory-mapped GPIO controllers.
|
|
|
|
The Western Digital MyBook Live has two memory-mapped GPIO controllers.
|
|
Both GPIO controller only have a single 8-bit data register, where GPIO
|
|
state can be read and/or written.
|
|
|
|
Required properties:
|
|
- compatible: should be "wd,mbl-gpio"
|
|
- reg-names: must contain
|
|
"dat" - data register
|
|
- reg: address + size pairs describing the GPIO register sets;
|
|
order must correspond with the order of entries in reg-names
|
|
- #gpio-cells: must be set to 2. The first cell is the pin number and
|
|
the 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.
|
|
|
|
Optional properties:
|
|
- no-output: GPIOs are read-only.
|
|
|
|
Examples:
|
|
gpio0: gpio0@e0000000 {
|
|
compatible = "wd,mbl-gpio";
|
|
reg-names = "dat";
|
|
reg = <0xe0000000 0x1>;
|
|
#gpio-cells = <2>;
|
|
gpio-controller;
|
|
};
|
|
|
|
gpio1: gpio1@e0100000 {
|
|
compatible = "wd,mbl-gpio";
|
|
reg-names = "dat";
|
|
reg = <0xe0100000 0x1>;
|
|
#gpio-cells = <2>;
|
|
gpio-controller;
|
|
no-output;
|
|
};
|