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For testing and hardware debugging a user may wish to override the divisor at runtime. By setting fsi_master_aspeed.bus_div=N, the divisor will be set to N, if 0 < N <= 0x3ff. This is a module parameter and not a device tree option as it will only need to be set when testing or debugging. Reviewed-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20200728025527.174503-5-joel@jms.id.au Signed-off-by: Joel Stanley <joel@jms.id.au>