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33 lines
972 B
33 lines
972 B
Avionic Design N-bit GPIO expander bindings |
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Required properties: |
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- compatible: should be "ad,gpio-adnp" |
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- reg: The I2C slave address for this device. |
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- interrupts: Interrupt specifier for the controllers interrupt. |
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- #gpio-cells: Should be 2. The first cell is the GPIO number and the |
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second cell is used to specify optional parameters: |
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- bit 0: polarity (0: normal, 1: inverted) |
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- gpio-controller: Marks the device as a GPIO controller |
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- nr-gpios: The number of pins supported by the controller. |
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The GPIO expander can optionally be used as an interrupt controller, in |
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which case it uses the default two cell specifier as described in |
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Documentation/devicetree/bindings/interrupt-controller/interrupts.txt. |
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Example: |
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gpioext: gpio-controller@41 { |
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compatible = "ad,gpio-adnp"; |
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reg = <0x41>; |
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interrupt-parent = <&gpio>; |
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interrupts = <160 1>; |
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gpio-controller; |
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#gpio-cells = <2>; |
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interrupt-controller; |
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#interrupt-cells = <2>; |
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nr-gpios = <64>; |
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};
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