Messages in this thread | | | Subject | Re: [PATCH v2 2/3] clk: fractional-divider: Introduce NO_PRESCALER flag | From | Liu Ying <> | Date | Thu, 22 Jul 2021 17:43:49 +0800 |
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On Thu, 2021-07-22 at 12:38 +0300, Andy Shevchenko wrote: > On Thu, Jul 22, 2021 at 12:33 PM Liu Ying <victor.liu@nxp.com> wrote: > > On Fri, 2021-07-16 at 16:34 +0300, Andy Shevchenko wrote: > > > The newly introduced flag, when set, makes the flow to skip > > > the assumption that the caller will use an additional 2^scale > > > prescaler to get the desired clock rate. > > > > As I mentioned in v1 comment, it seems to be good to decouple the > > prescaler knowledge from this common fractional divider clk driver. > > This way, we'll make it simpler and easier to maintain. Also, then, the > > NO_PRESCALER flag is not needed at all. However, it seems that two > > Intel drivers which use the frational divider drivers will be affected > > and rate negotiation logics need to be implemented for them. Please > > consider if it's doable or not. > > The current driver works for the certain hardware without this change. > If you think it's better, submit a proposal we will discuss.
Well, I'm not afford to do so. Just share an idea. I haven't got the intel HW to test. As I mentioned in v1 comment, it seems that you have experience on relevent drivers and HW to test, may I encourage you to do that :-) Or forget that if you really think you won't do that.
> > > If we ultimately keep the prescaler knowledge here, please consider to > > add the NO_PRESCALER flag for i.MX7ulp as it hasn't the prescaler IIUC. > > You mean there is a code which is currently using this driver w/o > taking into account this prescaller flavour? Can you, please, point > out, I'll definitely update it. Thanks for the catch!
drivers/clk/imx/clk-composite-7ulp.c
Regards, Liu Ying
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