Add multi mode support for omap-mcspi

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Merge series from Louis Chauvet <louis.chauvet@bootlin.com>:

This series adds the support for the omap-mcspi multi mode which allows
sending SPI messages with a shorter delay between CS and the message.

One drawback of the multi-mode is that the CS is raised between each word,
so it can only be used with messages containing 1 word transfers and
asking for cs_change. Few devices, like FPGAs, may easily workaround this
limitation.

The first patch removes the current implementation, which is working, but
don't comply with what is asked in the spi transfer (The CS is raised by
the hardware regardless of cs_change state). No drivers or board file use this
implementation upstream.

The second patch adds the implementation of the multi-mode, which complies
with what is asked in the SPI message.

The third patch is the suggested optimization for using MULTI mode in more
situations.

...

This commit is contained in:

Mark Brown 2024-03-29 01:32:23 +00:00

parent bb77c99ee6 e64d3b6fc9

commit 09f347cdd4

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2 changed files with 74 additions and 24 deletions

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95

drivers/spi/spi-omap2-mcspi.c

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3

include/linux/platform_data/spi-omap2-mcspi.h

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