spi: Add an helper to flush the message queue

2018-04-23T14:48:18Z

This is needed by the spi-mem logic to force all messages that have been queued before a memory operation to be sent before we start the memory operation. We do that in order to guarantee that spi-mem operations do not preempt regular SPI transfers. Signed-off-by: Boris Brezillon Signed-off-by: Mark Brown

spi: Expose spi_{map,unmap}_buf() for internal use

2018-04-23T14:48:06Z

spi_{map,unmap}_buf() are needed by the spi-mem logic that is about to be introduced to prepare data buffer for DMA operations. Remove the static specifier on these functions and add their prototypes to drivers/spi/internals.h. We do not export the symbols here because both SPI_MEM and SPI can't be enabled as modules and we'd like to prevent controller/device drivers from using these functions. Signed-off-by: Boris Brezillon Signed-off-by: Mark Brown

kernel.git/drivers/spi/internals.h, branch linux-5.4.y

spi: Add an helper to flush the message queue

spi: Expose spi_{map,unmap}_buf() for internal use