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| -rw-r--r-- | Documentation/devicetree/bindings/spi/spi-gpio.txt | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/spi/spi-gpio.txt b/Documentation/devicetree/bindings/spi/spi-gpio.txt new file mode 100644 index 000000000..52db562f1 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/spi-gpio.txt @@ -0,0 +1,43 @@ +SPI-GPIO devicetree bindings + +This represents a group of 3-n GPIO lines used for bit-banged SPI on dedicated +GPIO lines. + +Required properties: + + - compatible: should be set to "spi-gpio" + - #address-cells: should be set to <0x1> + - ranges + - sck-gpios: GPIO spec for the SCK line to use + - miso-gpios: GPIO spec for the MISO line to use + - mosi-gpios: GPIO spec for the MOSI line to use + - cs-gpios: GPIOs to use for chipselect lines. + Not needed if num-chipselects = <0>. + - num-chipselects: Number of chipselect lines. Should be <0> if a single device + with no chip select is connected. + +Deprecated bindings: + +These legacy GPIO line bindings can alternatively be used to define the +GPIO lines used, they should not be used in new device trees. + + - gpio-sck: GPIO spec for the SCK line to use + - gpio-miso: GPIO spec for the MISO line to use + - gpio-mosi: GPIO spec for the MOSI line to use + +Example: + + spi { + compatible = "spi-gpio"; + #address-cells = <0x1>; + ranges; + + sck-gpios = <&gpio 95 0>; + miso-gpios = <&gpio 98 0>; + mosi-gpios = <&gpio 97 0>; + cs-gpios = <&gpio 125 0>; + num-chipselects = <1>; + + /* clients */ + }; + |