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There is no good reason why the unique_id needs to be stored as 4 bits. The code will work without changes with a u8 since all values are already filtered while parsing the ACPI tables and Slave devID registers. Use u8 representation. This will allow us to encode a "IGNORE_UNIQUE_ID" value to account for firmware/BIOS creativity. Signed-off-by: Pierre-Louis Bossart <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Vinod Koul <[email protected]>