linux-kernel - Re: [PATCH v13 3/8] clk: Use devm_ in the register fixed factor clock

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Message-ID: <20181014202122.GA13473@centauri.lan>
Date:   Sun, 14 Oct 2018 22:21:22 +0200
From:   Niklas Cassel <niklas.cassel@...aro.org>
To:     Stephen Boyd <sboyd@...nel.org>, ilia.lin@...il.com,
        bjorn.andersson@...aro.org
Cc:     Ricardo Salveti <rsalveti@...lveti.net>, mturquette@...libre.com,
        robh+dt@...nel.org, mark.rutland@....com, andy.gross@...aro.org,
        david.brown@...aro.org, will.deacon@....com,
        Amit Kucheria <amit.kucheria@...aro.org>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v13 3/8] clk: Use devm_ in the register fixed factor clock

On Fri, Oct 12, 2018 at 03:08:17PM -0700, Stephen Boyd wrote:
> Quoting Ricardo Salveti (2018-09-14 11:53:02)
> > On Thu, Jun 14, 2018 at 6:55 PM <ilia.lin@...il.com> wrote:
> > >
> > > From: Ilia Lin <ilialin@...eaurora.org>
> > >
> > > Use devm_clk_hw_register instead of clk_hw_register
> > > to simplify the usage of this API. This way drivers that call
> > > the clk_hw_register_fixed_factor won't need to maintain
> > > a data structure for further cleanup.
> > >
> > > Signed-off-by: Ilia Lin <ilialin@...eaurora.org>
> > > Tested-by: Amit Kucheria <amit.kucheria@...aro.org>
> > > ---
> > >  drivers/clk/clk-fixed-factor.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
> > > index a5d402de5584..8e39bda8e596 100644
> > > --- a/drivers/clk/clk-fixed-factor.c
> > > +++ b/drivers/clk/clk-fixed-factor.c
> > > @@ -94,7 +94,7 @@ struct clk_hw *clk_hw_register_fixed_factor(struct device *dev,
> > >         init.num_parents = 1;
> > >
> > >         hw = &fix->hw;
> > > -       ret = clk_hw_register(dev, hw);
> > > +       ret = devm_clk_hw_register(dev, hw);
> > 
> > Not sure what is the current state of this patch-set, but this change
> > breaks drivers calling clk_hw_register_fixed_factor with a NULL dev
> > (e.g. imx_clk_fixed_factor), as devm_clk_hw_register needs a valid dev
> > for devres_add to work.
> > 
> 
> Yep. Probably better to just have a driver register the clk_hw structure
> itself with the clk framework vs. trying to get it right here in the
> generic type registration function.
> 

Hello Ilia, Stephen,

As you know this patch series is needed to get DVFS working on msm8996.

Ilia, are you planning on submitting a new patch set for this, or would
you prefer if we submitted a new patch version for you?

Looking at this patch series, this appears to be the only outstanding
review comment. Stephen, do you have any review comments on this series?


Kind regards,
Niklas