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The 16550 'miniUART' on the Raspberry Pi gets its input clock from different sources on RPi3 and RPi4. Fix the logic that derives the divisor for the 16550 baud clock on the respective platforms. While at it, make the input clock PCD patchable for RPi3 so we can manipulate it at runtime in a future patch. Co-authored-by: Pete Batard <pete@akeo.ie> Co-authored-by: Andrei Warkentin <andrey.warkentin@gmail.com> Co-authored-by: Ard Biesheuvel <ard.biesheuvel@arm.com> Signed-off-by: Pete Batard <pete@akeo.ie> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@arm.com> Reviewed-by: Pete Batard <pete@akeo.ie> Tested-by: Pete Batard <pete@akeo.ie>