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Describe the miniuart clock frequency in a _DSD property, so that it can be read from the Linux driver [1] The miniuart clock frequency is the core clock frequency on the Raspberry Pi. It can be modified by the user using the 'core_freq' property in the config.txt file. So, we fetch it from the underlying Raspberry Pi firmware. [1] https://lore.kernel.org/all/20220207232129.402882-1-athierry@redhat.com/ Signed-off-by: Adrien Thierry <athierry@redhat.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org>