linux-kernel - Re: [PATCH v3 2/2] clk: renesas: r9a06g032: Add clock domain support

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Message-ID: <CAMuHMdU_+U0iW+35OVZ-ExquE1s0bUtjM5e63zaOU9WFy8j_UA@mail.gmail.com>
Date:   Tue, 28 May 2019 09:34:29 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Gareth Williams <gareth.williams.jx@...esas.com>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] clk: renesas: r9a06g032: Add clock domain support

Hi Gareth,

On Fri, May 24, 2019 at 5:32 PM Gareth Williams
<gareth.williams.jx@...esas.com> wrote:
> There are several clocks on the r9ag032 which are currently not enabled
> in their drivers that can be delegated to clock domain system for power
> management. Therefore add support for clock domain functionality to the
> r9a06g032 clock driver.
>
> Signed-off-by: Gareth Williams <gareth.williams.jx@...esas.com>

Thanks for the update!

> --- a/drivers/clk/renesas/r9a06g032-clocks.c
> +++ b/drivers/clk/renesas/r9a06g032-clocks.c

> @@ -344,6 +351,86 @@ struct r9a06g032_clk_gate {
>
>  #define to_r9a06g032_gate(_hw) container_of(_hw, struct r9a06g032_clk_gate, hw)
>
> +static int create_add_module_clock(struct of_phandle_args *clkspec,
> +                                  struct device *dev)
> +{
> +       struct clk *clk;
> +       int error = 0;

No need to initialize to 0.

> +
> +       clk = of_clk_get_from_provider(clkspec);
> +       if (IS_ERR(clk))
> +               return PTR_ERR(clk);
> +
> +       error = pm_clk_create(dev);

> +static int r9a06g032_attach_dev(struct generic_pm_domain *pd,
> +                               struct device *dev)
> +{
> +       struct device_node *np = dev->of_node;
> +       struct of_phandle_args clkspec;
> +       int i = 0;
> +       int error;
> +
> +       while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i,
> +                                          &clkspec)) {
> +               int index;

scripts/checkpatch.pl says a blank line is missing.
Alternatively, you can move the declaration of index to the top of the
function, together with error and i.

> +               if (clkspec.np != pd->dev.of_node)
> +                       continue;
> +
> +               index = clkspec.args[0];
> +
> +               if (index < R9A06G032_CLOCK_COUNT &&
> +                   r9a06g032_clocks[index].managed) {
> +                       of_node_put(clkspec.np);

As the call below uses clkspec.np, the call to of_node_put() should be
after it, just before the error check.

> +
> +                       error = create_add_module_clock(&clkspec, dev);
> +                       if (error)
> +                               return error;
> +               }
> +               i++;
> +       }
> +
> +       return 0;
> +}

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds