Commit: 0ebb261a0b2d ("spi: spi-mem: Add SPI_MEM_NO_DATA to the spi_mem_data_dir enum")
in linux.
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 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.
This also fixes a bug identified with the atmel-quaspi driver.
The spi-nor core, when erasing sectors, fills the spi_mem_op template
using SPI_MEM_OP_NO_DATA, which initializes all the data members with
value zero. This is wrong because data.dir is treated as SPI_MEM_DATA_IN,
which translates in our driver to read accesses for erases (RICR), while
the controller expects write accesses (WICR).
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Some controllers are exposing high-level interfaces to access various
kind of SPI memories. Unfortunately they do not fit in the current
spi_controller model and usually have drivers placed in
drivers/mtd/spi-nor which are only supporting SPI NORs and not SPI
memories in general.
This is an attempt at defining a SPI memory interface which works for
all kinds of SPI memories (NORs, NANDs, SRAMs).
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Jagan Teki <jagan@openedev.com>
