[PATCH] clk: fractional-divider: Improve approximation when zero based

[Frank Oltmanns]

Hi Stephen,

On 2023-06-12 at 14:39:00 -0700, Stephen Boyd <sboyd at kernel.org> wrote:
> Quoting Frank Oltmanns (2023-05-29 06:34:33)
>> Consider the CLK_FRAC_DIVIDER_ZERO_BASED flag when finding the best
>> approximation for m and n. By doing so, increase the range of valid
>> values for the numerator and denominator by 1.
>>
>> Cc: A.s. Dong <aisheng.dong at nxp.com
>> Signed-off-by: Frank Oltmanns <frank at oltmanns.dev>
>> ---
>> I stumpled upon this, when familiarizing myself with clk drivers. Unfortunately,
>> I have no boards to test this patch. It seems the only user of this flag in
>> mainline is drivers/clk/imx/clk-composite-7ulp.c, therefore I'm cc-ing
>> get_maintainers.pl --git-blame -f drivers/clk/imx/clk-composite-7ulp.c
>> in the hopes of a wider audience.
>>
>> Thank you for considering this contribution,
>
> Thanks for looking at this. Can you add a kunit test (or a suite of
> tests) to confirm that this doesn't break existing functionality and
> also improves a case that would have failed or been suboptimal before?

Thank you for your feedback, I've submitted a V2 that contains the
tests:

https://lore.kernel.org/lkml/20230613083626.227476-1-frank@oltmanns.dev/

Thanks,
  Frank