Kernel-4.18.0-80.el8_spi-gpio

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 */
};