spi: add ancillary device support

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Introduce support for ancillary devices, similar to existing
implementation for I2C. This is useful for devices having
multiple chip-selects, for example some microcontrollers
provide a normal SPI interface and a flashing SPI interface.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20210621175359.126729-2-sebastian.reichel@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Sebastian Reichel 2021-06-21 19:53:55 +02:00 • committed by Mark Brown

parent 476ad3ff89

commit 0c79378c01

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2 changed files with 108 additions and 31 deletions

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161

drivers/spi/spi.c

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2

include/linux/spi/spi.h

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