linux-kernel - Re: [PATCH v3 08/11] clk: renesas: Add CPG core wrapper for RZ/G2L SoC

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Date:   Thu, 10 Jun 2021 15:03:48 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v3 08/11] clk: renesas: Add CPG core wrapper for RZ/G2L SoC

Hi Prabhakar,

On Wed, Jun 9, 2021 at 5:33 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> Add CPG core wrapper for RZ/G2L family.
>
> Based on a patch in the BSP by Binh Nguyen
> <binh.nguyen.jz@...esas.com>.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@...renesas.com>

Thanks for your patch!

> --- a/drivers/clk/renesas/Kconfig
> +++ b/drivers/clk/renesas/Kconfig
> @@ -182,6 +182,11 @@ config CLK_RCAR_USB2_CLOCK_SEL
>         help
>           This is a driver for R-Car USB2 clock selector
>
> +config CLK_RZG2L
> +       bool "Renesas RZ/G2L SoC clock support" if COMPILE_TEST && !ARCH_RENESAS

s/SoC/family/?

I think "if COMPILE_TEST", as all other entries are using, is sufficient.

> +       depends on ARCH_RENESAS || COMPILE_TEST

I think this can be dropped.

> +       select RESET_CONTROLLER
> +
>  # Generic

> --- /dev/null
> +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.c

> +static struct clk
> +*rzg2l_cpg_clk_src_twocell_get(struct of_phandle_args *clkspec,
> +                              void *data)
> +{
> +       unsigned int clkidx = clkspec->args[1];
> +       struct rzg2l_cpg_priv *priv = data;
> +       struct device *dev = priv->dev;
> +       const char *type;
> +       struct clk *clk;
> +
> +       switch (clkspec->args[0]) {
> +       case CPG_CORE:
> +               type = "core";
> +               if (clkidx > priv->last_dt_core_clk) {
> +                       dev_err(dev, "Invalid %s clock index %u\n", type, clkidx);
> +                       return ERR_PTR(-EINVAL);
> +               }
> +               clk = priv->clks[clkidx];
> +               break;
> +
> +       case CPG_MOD:
> +               type = "module";
> +               if (clkidx > priv->num_core_clks + priv->num_mod_clks) {

The range of module clocks in DT specifiers starts at zero, so

    if (clkidx > priv->num_mod_clks) {


> +                       dev_err(dev, "Invalid %s clock index %u\n", type,
> +                               clkidx);
> +                       return ERR_PTR(-EINVAL);
> +               }
> +               clk = priv->clks[priv->num_core_clks + clkidx];
> +               break;
> +
> +       default:
> +               dev_err(dev, "Invalid CPG clock type %u\n", clkspec->args[0]);
> +               return ERR_PTR(-EINVAL);
> +       }
> +
> +       if (IS_ERR(clk))
> +               dev_err(dev, "Cannot get %s clock %u: %ld", type, clkidx,
> +                       PTR_ERR(clk));
> +       else
> +               dev_dbg(dev, "clock (%u, %u) is %pC at %lu Hz\n",
> +                       clkspec->args[0], clkspec->args[1], clk,
> +                       clk_get_rate(clk));
> +       return clk;
> +}

With the above fixed:
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

I can fix these while applying.

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