linux-kernel - Re: [PATCH 5/6] clk: samsung: Extract parent clock enabling to common function

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Date:   Wed, 8 Feb 2023 00:00:36 -0600
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Chanho Park <chanho61.park@...sung.com>,
        David Virag <virag.david003@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] clk: samsung: Extract parent clock enabling to common function

On Fri, 3 Feb 2023 at 03:14, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 03/02/2023 07:09, Sam Protsenko wrote:
> > Extract parent clock enabling from exynos_arm64_register_cmu() to
> > dedicated function. No functional change.
> >
> > No functional change.
> >
> > Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> > ---
> >  drivers/clk/samsung/clk-exynos-arm64.c | 53 +++++++++++++++++---------
> >  1 file changed, 36 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/clk/samsung/clk-exynos-arm64.c b/drivers/clk/samsung/clk-exynos-arm64.c
> > index b921b9a1134a..361663223a24 100644
> > --- a/drivers/clk/samsung/clk-exynos-arm64.c
> > +++ b/drivers/clk/samsung/clk-exynos-arm64.c
> > @@ -56,6 +56,41 @@ static void __init exynos_arm64_init_clocks(struct device_node *np,
> >       iounmap(reg_base);
> >  }
> >
> > +/**
> > + * exynos_arm64_enable_bus_clk - Enable parent clock of specified CMU
> > + *
> > + * @dev:     Device object; may be NULL if this function is not being
> > + *           called from platform driver probe function
> > + * @np:              CMU device tree node
> > + * @cmu:     CMU data
> > + *
> > + * Keep CMU parent clock running (needed for CMU registers access).
> > + *
> > + * Return: 0 on success or negative error code on failure.
> > + */
> > +static int __init exynos_arm64_enable_bus_clk(struct device *dev,
> > +             struct device_node *np, const struct samsung_cmu_info *cmu)
>
> Align the arguments.
>

In this particular case, if I align arguments to match the open
parentheses, the last argument declaration won't fit the 80 characters
limit. I know it's not a strict requirement anymore, but the whole
point of breaking the line is to kind of keep it short. So I suggest
keeping this one as is, if you don't have a strong opinion about it.

> > +{
> > +     struct clk *parent_clk;
> > +
> > +     if (!cmu->clk_name)
> > +             return 0;
> > +
> > +     if (dev)
> > +             parent_clk = clk_get(dev, cmu->clk_name);
> > +     else
> > +             parent_clk = of_clk_get_by_name(np, cmu->clk_name);
> > +
> > +     if (IS_ERR(parent_clk)) {
> > +             pr_err("%s: could not find bus clock %s; err = %ld\n",
> > +                    __func__, cmu->clk_name, PTR_ERR(parent_clk));
> > +             return PTR_ERR(parent_clk);
> > +     }
> > +
> > +     clk_prepare_enable(parent_clk);
> > +     return 0;
>
> You do not check the return value in exynos_arm64_register_cmu() below,
> so either make it a void or add the check.
>

Thanks, will add the check in v2.

>
> Best regards,
> Krzysztof
>