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The ast2600 is a new generation of SoC from ASPEED. Similarly to the ast2400 and ast2500, it has a GPIO controller for it's 3.3V GPIO pins. Additionally, it has a GPIO controller for 36 1.8V GPIO pins. We use the ngpio property to differentiate between these controllers. Signed-off-by: Rashmica Gupta <rashmica.g@gmail.com> Link: https://lore.kernel.org/r/20190906062547.13264-1-rashmica.g@gmail.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
40 lines
1.2 KiB
Plaintext
40 lines
1.2 KiB
Plaintext
Aspeed GPIO controller Device Tree Bindings
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Required properties:
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- compatible : Either "aspeed,ast2400-gpio", "aspeed,ast2500-gpio",
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or "aspeed,ast2600-gpio".
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- #gpio-cells : Should be two
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- First cell is the GPIO line number
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- Second cell is used to specify optional
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parameters (unused)
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- reg : Address and length of the register set for the device
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- gpio-controller : Marks the device node as a GPIO controller.
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- interrupts : Interrupt specifier (see interrupt bindings for
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details)
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- interrupt-controller : Mark the GPIO controller as an interrupt-controller
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Optional properties:
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- clocks : A phandle to the clock to use for debounce timings
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- ngpios : Number of GPIOs controlled by this controller. Should be set
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when there are multiple GPIO controllers on a SoC (ast2600).
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The gpio and interrupt properties are further described in their respective
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bindings documentation:
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- Documentation/devicetree/bindings/gpio/gpio.txt
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- Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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Example:
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gpio@1e780000 {
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#gpio-cells = <2>;
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compatible = "aspeed,ast2400-gpio";
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gpio-controller;
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interrupts = <20>;
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reg = <0x1e780000 0x1000>;
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interrupt-controller;
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};
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