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SubjectRe: [PATCH RFC] clk: ux500: add range to usleep_range
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On Thu, 2019-04-11 at 04:56 +0200, Nicholas Mc Guire wrote:
> On Wed, Apr 10, 2019 at 03:53:51PM -0700, Stephen Boyd wrote:
> > Quoting Nicholas Mc Guire (2019-04-06 20:13:24)
> > > Providing a range for usleep_range() allows the hrtimer subsystem to
> > > coalesce timers - the delay is runtime configurable so a factor 2
> > > is taken to provide the range.
> > >
> > > Signed-off-by: Nicholas Mc Guire <hofrat@opentech.at>
> > > ---
> >
> > I think this driver is in maintenance mode. I'll wait for Ulf to ack or
> > review this change before applying.
> >
> > > diff --git a/drivers/clk/ux500/clk-sysctrl.c b/drivers/clk/ux500/clk-sysctrl.c
> > > index 7c0403b..a1fa3fb 100644
> > > --- a/drivers/clk/ux500/clk-sysctrl.c
> > > +++ b/drivers/clk/ux500/clk-sysctrl.c
> > > @@ -42,7 +42,7 @@ static int clk_sysctrl_prepare(struct clk_hw *hw)
> > > clk->reg_bits[0]);
> > >
> > > if (!ret && clk->enable_delay_us)
> > > - usleep_range(clk->enable_delay_us, clk->enable_delay_us);
> > > + usleep_range(clk->enable_delay_us, clk->enable_delay_us*2);
> >
> > Please add space around that multiply.
> >
> I can do that but it does not seem common and also checkpatch
> did not complain about this - now a simple grep -re "\*10" on the
> kernel shows that it seems more common not to use spaces around *
> that to use them.

Not really

$ git grep -P '\*\s*10' | grep -oh -P '\*\s*10' | \
sort | uniq -c | sort -rn | head
11800 * 10
1705 *10
179 * 10
74 * 10
67 * 10
20 * 10
20 * 10
14 * 10
14 * 10
12 * 10

> Greping specifically for cases using usleep_range()
> (not that many) it seems more or less evenly devided between space
> and no space - so the concern is overlooking that factor 2 ?
>
> thx!
> hofrat

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