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46 lines
1.3 KiB
46 lines
1.3 KiB
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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