linux-kernel - Re: [PATCH v6 2/2] watchdog: Add Renesas RZ/N1 Watchdog driver

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Message-ID: <CAMuHMdXLpuoTiOn7yDwTTnjkqWJ4PXuhdCLiLcOP2uyzyV6==A@mail.gmail.com>
Date:   Wed, 27 Apr 2022 14:32:16 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        tzungbi@...nel.org,
        Linux Watchdog Mailing List <linux-watchdog@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Phil Edworthy <phil.edworthy@...esas.com>
Subject: Re: [PATCH v6 2/2] watchdog: Add Renesas RZ/N1 Watchdog driver

Hi Jean-Jacques,

On Wed, Apr 13, 2022 at 10:25 AM Jean-Jacques Hiblot
<jjhiblot@...phandler.com> wrote:
> From: Phil Edworthy <phil.edworthy@...esas.com>
>
> This is a driver for the standard WDT on the RZ/N1 devices. This WDT has
> very limited timeout capabilities. However, it can reset the device.
> To do so, the corresponding bits in the SysCtrl RSTEN register need to
> be enabled. This is not done by this driver.
>
> Signed-off-by: Phil Edworthy <phil.edworthy@...esas.com>
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> Reviewed-by: Tzung-Bi Shih <tzungbi@...nel.org>

Thanks for your patch!

> --- /dev/null
> +++ b/drivers/watchdog/rzn1_wdt.c

> +static int rzn1_wdt_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct rzn1_watchdog *wdt;
> +       struct device_node *np = dev->of_node;
> +       struct clk *clk;
> +       int ret;
> +       int irq;
> +
> +       wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
> +       if (!wdt)
> +               return -ENOMEM;
> +
> +       wdt->base = devm_platform_ioremap_resource(pdev, 0);
> +       if (IS_ERR(wdt->base))
> +               return PTR_ERR(wdt->base);
> +
> +       irq = platform_get_irq(pdev, 0);
> +       if (irq < 0)
> +               return irq;
> +
> +       ret = devm_request_irq(dev, irq, rzn1_wdt_irq, 0,
> +                              np->name, wdt);
> +       if (ret) {
> +               dev_err(dev, "failed to request irq %d\n", irq);
> +               return ret;
> +       }
> +
> +       clk = devm_clk_get(dev, NULL);
> +       if (IS_ERR(clk)) {
> +               dev_err(dev, "failed to get the clock\n");
> +               return PTR_ERR(clk);
> +       }
> +
> +       ret = clk_prepare_enable(clk);
> +       if (ret) {
> +               dev_err(dev, "failed to prepare/enable the clock\n");
> +               return ret;
> +       }
> +
> +       ret = devm_add_action_or_reset(dev, rzn1_wdt_clk_disable_unprepare,
> +                                      clk);
> +       if (ret) {
> +               dev_err(dev, "failed to register clock unprepare callback\n");

Please remove this error message.
devm_add_action_or_reset() only fails when running out of memory,
in which case the memory allocation core has already printed an
error message.

> +               return ret;
> +       }

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