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dt-bindings: Document the Synopsys GPIO via CREG bindings

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This patch adds documentation of device tree bindings for the Synopsys
GPIO via CREG driver.

Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Eugeniy Paltsev 2018-09-28 16:15:31 +03:00 committed by Linus Walleij
parent 3ea47b447d
commit 29f55cc664
1 changed files with 21 additions and 0 deletions
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Documentation/devicetree/bindings/gpio/snps,creg-gpio.txt Normal file
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Synopsys GPIO via CREG (Control REGisters) driver
Required properties:
- compatible : "snps,creg-gpio-hsdk" or "snps,creg-gpio-axs10x".
- reg : Exactly one register range with length 0x4.
- #gpio-cells : Since the generic GPIO binding is used, the
amount of cells must be specified as 2. The first cell is the
pin number, the second cell is used to specify optional parameters:
See "gpio-specifier" in .../devicetree/bindings/gpio/gpio.txt.
- gpio-controller : Marks the device node as a GPIO controller.
- ngpios: Number of GPIO pins.
Example:
gpio: gpio@f00014b0 {
compatible = "snps,creg-gpio-hsdk";
reg = <0xf00014b0 0x4>;
gpio-controller;
#gpio-cells = <2>;
ngpios = <2>;
};