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drivers: spi: allow limiting reads

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For some SPI controllers it's not possible to keep the CS active between
transfers and they are limited to a known number of bytes.
This splits spi_flash reads into different iterations in order to respect
the SPI controller limits.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
This commit is contained in:
Álvaro Fernández Rojas 2018-01-23 17:14:56 +01:00 • committed by Jagan Teki
parent 48263504c8
commit 8af74edc30
2 changed files with 6 additions and 0 deletions
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3
include/spi.h
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@ -86,6 +86,8 @@ struct dm_spi_slave_platdata {
* @cs: ID of the chip select connected to the slave.
* @mode: SPI mode to use for this slave (see SPI mode flags)
* @wordlen: Size of SPI word in number of bits
* @max_read_size: If non-zero, the maximum number of bytes which can
* be read at once.
* @max_write_size: If non-zero, the maximum number of bytes which can
* be written at once, excluding command bytes.
* @memory_map: Address of read-only SPI flash access.
@ -102,6 +104,7 @@ struct spi_slave {
#endif
uint mode;
unsigned int wordlen;
unsigned int max_read_size;
unsigned int max_write_size;
void *memory_map;