[2/5] USB: serial: f81232: add high baud rate support

[Johan Hovold <johan@kernel.org>]

On Tue, Jan 23, 2018 at 10:08:24AM +0800, Ji-Ze Hong (Peter Hong) wrote:
> Hi Andy,
> 
> Andy Shevchenko 於 2018/1/22 下午 10:55 寫道:
> > On Mon, Jan 22, 2018 at 9:58 AM, Ji-Ze Hong (Peter Hong)
> > <hpeter@gmail.com> wrote:
> >> The F81232 had 4 clocksource 1.846/18.46/14.77/24MHz and baud rates
> >> can be up to 1.5Mbits with 24MHz.
> >>
> >> F81232 Clock registers (106h)
> >>
> >> Bit1-0:     Clock source selector
> >>                      00: 1.846MHz.
> >>                      01: 18.46MHz.
> >>                      10: 24MHz.
> >>                      11: 14.77MHz.
> > 
> > Hmm... Why not to provide a proper clk driver (based on table variant
> > of clk-divider) and use it here?
> 
> It seems too complex to use clock framework in this driver.
> What do you think about this, Johan ?

Yeah, you don't need to implement a clk driver for this. If anyone
thinks that would simplify things, I'd be happy to consider it as a
follow-on patch.

Thanks,
Johan
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