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

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Message-ID: <fc42f228-9fbc-be0d-7585-71c5a908c125@traphandler.com>
Date:   Wed, 27 Apr 2022 15:33:44 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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


On 27/04/2022 14:32, Geert Uytterhoeven wrote:
> 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.

OK. I'll remove this.

Thanks,

JJ

>
>> +               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