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3 Commits

Author SHA1 Message Date
Mark Brown
b158935f70 spi: Provide common spi_message processing loop 
The loops which SPI controller drivers use to process the list of transfers
in a spi_message are typically very similar and have some error prone areas
such as the handling of /CS. Help simplify drivers by factoring this code
out into the core - if drivers provide a transfer_one() function instead
of a transfer_one_message() function the core will handle processing at the
message level.

/CS can be controlled by either setting cs_gpio or providing a set_cs
function. If this is not possible for hardware reasons then both can be
omitted and the driver should continue to implement manual /CS handling.

This is a first step in refactoring and it is expected that there will be
further enhancements, for example factoring out of the mapping of transfers
for DMA and the initiation and completion of interrupt driven transfers.

Signed-off-by: Mark Brown <broonie@linaro.org>
 2013-10-11 20:09:50 +01:00
Mark Brown
31a2c46cd9 spi/trace: Trace length of SPI messages on completion 
Signed-off-by: Mark Brown <broonie@linaro.org>
 2013-10-08 18:03:05 +01:00
Mark Brown
56ec1978ff spi: Provide trace points for message processing 
Provide tracepoints for the lifecycle of a message from submission to
completion and for the active time for masters to help with performance
analysis of SPI I/O.

Signed-off-by: Mark Brown <broonie@linaro.org>
 2013-10-07 20:02:01 +01:00