spi: Introduce SPI_INVALID_CS and is_valid_cs()

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The SPI core inconsistently uses the marker value for unused chip select
pin. Define a constant (with appropriate type) and introduce is_valid_cs()
helper function to avoid spreading this inconsistency in the future.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://msgid.link/r/20240307150256.3789138-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Andy Shevchenko 2024-03-07 17:01:01 +02:00 • committed by Mark Brown

parent 14fe5a98fb

commit be84be4a35

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1 changed files with 23 additions and 16 deletions

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drivers/spi/spi.c

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