SPI-GPIO devicetree bindings
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This represents a group of 3-n GPIO lines used for bit-banged SPI on dedicated
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GPIO lines.
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Required properties:
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- compatible: should be set to "spi-gpio"
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- #address-cells: should be set to <0x1>
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- ranges
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- sck-gpios: GPIO spec for the SCK line to use
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- miso-gpios: GPIO spec for the MISO line to use
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- mosi-gpios: GPIO spec for the MOSI line to use
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- cs-gpios: GPIOs to use for chipselect lines.
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Not needed if num-chipselects = <0>.
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- num-chipselects: Number of chipselect lines. Should be <0> if a single device
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with no chip select is connected.
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Deprecated bindings:
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These legacy GPIO line bindings can alternatively be used to define the
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GPIO lines used, they should not be used in new device trees.
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- gpio-sck: GPIO spec for the SCK line to use
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- gpio-miso: GPIO spec for the MISO line to use
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- gpio-mosi: GPIO spec for the MOSI line to use
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Example:
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spi {
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compatible = "spi-gpio";
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#address-cells = <0x1>;
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ranges;
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sck-gpios = <&gpio 95 0>;
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miso-gpios = <&gpio 98 0>;
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mosi-gpios = <&gpio 97 0>;
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cs-gpios = <&gpio 125 0>;
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num-chipselects = <1>;
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/* clients */
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};
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