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spi: dw: Handle any number of gpiod CS lines #6161
Even when configured to use only gpiod CS lines, the DW SPI controller still expects a bit to be set in the SER register, otherwise transfers stall. For the csgpiod case, nominate bit 0 for the job.
Even when configured to use only gpiod CS lines, the DW SPI controller still expects a bit to be set in the SER register, otherwise transfers stall. For the csgpiod case, nominate bit 0 for the job.
See: https://github.com/raspberrypi/linux/issues/6159