On Mon, Feb 20, 2017 at 04:35:12PM +0100, Adrian Fiergolski wrote: > If an SPI controller doesn't support 8 bit transfers > (master->bits_per_word_mask), it will be never registered (tested with > spidev): > of_register_spi_device calls spi_add_device which calls spi_setup. The last > takes as an argument spi_device struct, which, in case of spidev, has > bits_per_word set to 0. Thus, the spi_setup function will set it to default > 8. Further, the same function will call __spi_validate_bits_per_word which > will fail the whole registration for controllers not supporting 8 bit > transfers (i.e. xilinx-spi). This doens't make much sense, if a device driver requires a given number of bits per word forcing a different value via device tree is not going to result in the driver actually working. If you want to use a device with a controller with restricted bits per word support you need to change the device driver to support the limited capabilities of the controller.
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