OpenWrt – Rev 1

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config SPI_GPIO_CUSTOM
        tristate "Custom GPIO-based SPI driver"
        depends on GENERIC_GPIO
        select SPI_GPIO
        help
          This is an SPI driver to register 1 to 4 custom SPI buses using
          GPIO lines. Each bus can have up to 8 slaves.
          The devices will be exposed to userspace as /dev/spidevX.X
          
          This module is maily intended to interface microcontrollers
          and other SPI devices without a specific kernel driver.

          This support is also available as a module.  If so, the module
          will be called spi-gpio-custom.