spi: Add spi_is_bpw_supported()

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This let SPI clients check if the controller supports a particular word
width. drivers/gpu/drm/tinydrm/mipi-dbi.c will use this to determine if
the controller supports 16-bit for RGB565 pixels. If it doesn't it will
swap the bytes before transfer on little endian machines.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

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Noralf Trønnes 2019-04-12 11:41:30 +02:00 • committed by Mark Brown

parent 9e98c678c2

commit e6f3f7e4dc

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include/linux/spi/spi.h

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