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spi: Add parameter for maximum write size

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Some SPI controllers (e.g. Intel ICH) have a limit on the number of SPI
bytes that can be written at a time. Add this as a parameter so that
clients of the SPI interface can respect this value.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2013-03-11 06:08:05 +00:00
parent 1853030e21
commit 0c456cee95
1 changed files with 3 additions and 0 deletions
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3
include/spi.h
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@ -49,10 +49,13 @@
* *
* bus: ID of the bus that the slave is attached to. * bus: ID of the bus that the slave is attached to.
* cs: ID of the chip select connected to the slave. * cs: ID of the chip select connected to the slave.
* max_write_size: If non-zero, the maximum number of bytes which can
* be written at once, excluding command bytes.
*/ */
struct spi_slave { struct spi_slave {
unsigned int bus; unsigned int bus;
unsigned int cs; unsigned int cs;
unsigned int max_write_size;
}; };
/*----------------------------------------------------------------------- /*-----------------------------------------------------------------------