spi: Allow SPI controller override device buswidth

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Currently ACPI firmware description for a SPI device does not have any
method to describe the data buswidth on the board.

So even through the controller and device may support higher modes than
standard SPI, it cannot be assumed that the board does - as such, that
device is limited to standard SPI in such a circumstance.

As a workaround, allow the controller driver supply buswidth override bits,
which are used inform the core code that the controller driver knows the
buswidth supported on that board for that device.

A host controller driver might know this info from DMI tables, for example.

Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1582903131-160033-2-git-send-email-john.garry@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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John Garry 2020-02-28 23:18:49 +08:00 • committed by Mark Brown

parent 3d24b2a470

commit ea23578611

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2 changed files with 6 additions and 1 deletions

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4

drivers/spi/spi.c

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3

include/linux/spi/spi.h

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