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spi: spi-mem: Add SPI_MEM_NO_DATA to the spi_mem_data_dir enum

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When defining spi_mem_op templates we don't necessarily know the size
that will be passed when the template is actually used, and basing the
supports_op() check on op->data.nbytes to know whether there will be
data transferred for a specific operation is this not possible.

Add SPI_MEM_NO_DATA to the spi_mem_data_dir enum so that we can base
our checks on op->data.dir instead of op->data.nbytes.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Boris Brezillon 2018-11-06 17:05:31 +01:00 committed by Mark Brown
parent 6afe76a672
commit 0ebb261a0b
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2 changed files with 3 additions and 1 deletions
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2
drivers/spi/spi-mem.c
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@ -142,7 +142,7 @@ static bool spi_mem_default_supports_op(struct spi_mem *mem,
spi_check_buswidth_req(mem, op->dummy.buswidth, true))
return false;
if (op->data.nbytes &&
if (op->data.dir != SPI_MEM_NO_DATA &&
spi_check_buswidth_req(mem, op->data.buswidth,
op->data.dir == SPI_MEM_DATA_OUT))
return false;

2
include/linux/spi/spi-mem.h
View File

@ -57,10 +57,12 @@
/**
* enum spi_mem_data_dir - describes the direction of a SPI memory data
* transfer from the controller perspective
* @SPI_MEM_NO_DATA: no data transferred
* @SPI_MEM_DATA_IN: data coming from the SPI memory
* @SPI_MEM_DATA_OUT: data sent to the SPI memory
*/
enum spi_mem_data_dir {
SPI_MEM_NO_DATA,
SPI_MEM_DATA_IN,
SPI_MEM_DATA_OUT,
};