serial: sh-sci: Compute overrun_bit without using baud rate algo
The overrun bit index is a property of the hardware. It's currently computed based on a different and unrelated hardware property, the baud rate calculation algorithm. Compute it using hardware identification information only. Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
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