[PATCH] serial: mtk: rewrite the setbrg function

[Tom Rini]

On Fri, Mar 05, 2021 at 10:35:39AM +0800, Weijie Gao wrote:

> Currently the setbrg logic of serial-mtk is messy, and should be rewritten.
> Also an option is added to make it possible to use highspeed-3 mode for all
> bauds.
> 
> The new logic is:
> 1. If baud clock > 12MHz
>    a) If baud <= 115200, highspeed-0 mode will be used (ns16550 compatible)
>    b) If baud <= 576000, highspeed-2 mode will be used
>    c) any bauds > 576000, highspeed-3 mode will be used
> 2. If baud clock <= 12MHz
>    Forced highspeed-3 mode
>    a) If baud <= 115200, calculates the divisor using DIV_ROUND_CLOSEST
>    b) any bauds > 115200, the same as 1. c)
> 
> Signed-off-by: Weijie Gao <weijie.gao at mediatek.com>

Applied to u-boot/next, thanks!

-- 
Tom
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