spi: dt-bindings: Document the IBM FSI-attached SPI controller

IBM Power processors have a SPI controller that can be accessed
over FSI from a service processor. Document it.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240514192630.152747-1-eajames@linux.ibm.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Eddie James 2024-05-14 14:26:30 -05:00 • committed by Mark Brown
commit 060bbd65dd
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