Unverified Commit f6c911f3 authored Nov 17, 2022 by Tudor Ambarus Committed by Mark Brown Nov 18, 2022

spi: dt-bindings: Introduce spi-cs-setup-ns property



SPI NOR flashes have specific cs-setup time requirements without which
they can't work at frequencies close to their maximum supported frequency,
as they miss the first bits of the instruction command. Unrecognized
commands are ignored, thus the flash will be unresponsive. Introduce the
spi-cs-setup-ns property to allow spi devices to specify their cs setup
time.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20221117105249.115649-2-tudor.ambarus@microchip.com


Signed-off-by: Mark Brown <broonie@kernel.org>

parent 84b60f2b

Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml

+5 −0

Original line number	Diff line number	Diff line
		@@ -44,6 +44,11 @@ properties:
		description:
		Maximum SPI clocking speed of the device in Hz.

		spi-cs-setup-ns:
		description:
		Delay in nanosecods to be introduced by the controller after CS is
		asserted.

		spi-rx-bus-width:
		description:
		Bus width to the SPI bus used for read transfers.