47 lines
1.3 KiB
Plaintext
47 lines
1.3 KiB
Plaintext
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GPIO Driver for XRA1403 16-BIT GPIO Expander With Reset Input from EXAR
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The XRA1403 is an 16-bit GPIO expander with an SPI interface. Features available:
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- Individually programmable inputs:
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- Internal pull-up resistors
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- Polarity inversion
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- Individual interrupt enable
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- Rising edge and/or Falling edge interrupt
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- Input filter
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- Individually programmable outputs
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- Output Level Control
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- Output Three-State Control
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Properties
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----------
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Check documentation for SPI and GPIO controllers regarding properties needed to configure the node.
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- compatible = "exar,xra1403".
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- reg - SPI id of the device.
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- gpio-controller - marks the node as gpio.
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- #gpio-cells - should be two where the first cell is the pin number
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and the second one is used for optional parameters.
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Optional properties:
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-------------------
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- reset-gpios: in case available used to control the device reset line.
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- interrupt-controller - marks the node as interrupt controller.
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- #interrupt-cells - should be two and represents the number of cells
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needed to encode interrupt source.
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Example
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--------
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gpioxra0: gpio@2 {
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compatible = "exar,xra1403";
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reg = <2>;
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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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reset-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>;
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spi-max-frequency = <1000000>;
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};
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