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34 lines
1.0 KiB
34 lines
1.0 KiB
Generic Parallel-in/Serial-out Shift Register GPIO Driver |
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This binding describes generic parallel-in/serial-out shift register |
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devices that can be used for GPI (General Purpose Input). This includes |
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SN74165 serial-out shift registers and the SN65HVS88x series of |
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industrial serializers. |
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Required properties: |
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- compatible : Should be "pisosr-gpio". |
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- gpio-controller : Marks the device node as a GPIO controller. |
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- #gpio-cells : Should be two. For consumer use see gpio.txt. |
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Optional properties: |
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- ngpios : Number of used GPIO lines (0..n-1), default is 8. |
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- load-gpios : GPIO pin specifier attached to load enable, this |
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pin is pulsed before reading from the device to |
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load input pin values into the device. |
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For other required and optional properties of SPI slave |
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nodes please refer to ../spi/spi-bus.txt. |
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Example: |
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gpio@0 { |
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compatible = "ti,sn65hvs882", "pisosr-gpio"; |
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gpio-controller; |
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#gpio-cells = <2>; |
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load-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>; |
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reg = <0>; |
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spi-max-frequency = <1000000>; |
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spi-cpol; |
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};
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