regmap: spi: Don't use spi_write_then_read()
Currently SPI reads are implemented using spi_write_then_read(). This is a
convenience API which as well as constructing a SPI message from parameters
basically the same as for a bytestream read operation also bounces things
into a memory buffer to allow callers to use stack or other non-DMAable
memory. Since regmap should already be ensuring that everything can be
DMAed further up the stack this copy is redundant so switch to using the
underlying spi_sync() API with the buffers provided by the core directly.
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed
