linux-kernel - Re: [PATCH v1 10/11] watchdog: bd9576_wdt: switch to using devm_fwnode_gpiod

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Date:   Mon, 5 Sep 2022 14:09:09 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
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        Richard Weinberger <richard@....at>,
        David Airlie <airlied@...ux.ie>,
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        Alyssa Rosenzweig <alyssa@...enzweig.io>,
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        Jonathan Hunter <jonathanh@...dia.com>,
        Rob Herring <robh@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Pali Rohár <pali@...nel.org>,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
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        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 10/11] watchdog: bd9576_wdt: switch to using devm_fwnode_gpiod_get()

On Mon, Sep 5, 2022 at 9:33 AM Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>
> I would like to stop exporting OF-specific devm_gpiod_get_from_of_node()
> so that gpiolib can be cleaned a bit, so let's switch to the generic
> fwnode property API.
>
> While at it switch the rest of the calls to read properties in

it, switch

> bd9576_wdt_probe() to the generic device property API as well.

...

>         struct device *dev = &pdev->dev;

struct device *parent = dev->parent;

can make your code slightly neater.

...

> +       count = device_property_count_u32(dev->parent, "rohm,hw-timeout-ms");
> +       if (count < 0 && count != -EINVAL)
> +               return count;
> +
> +       if (count > 0) {

> +               if (count > ARRAY_SIZE(hw_margin))
> +                       return -EINVAL;

Why double check? You may move it out of the (count > 0).

...

> -       if (ret == 1)
> -               hw_margin_max = hw_margin[0];

> +               ret = device_property_read_u32_array(dev->parent,
> +                                                    "rohm,hw-timeout-ms",
> +                                                    hw_margin, count);
> +               if (ret < 0)
> +                       return ret;

So, only this needs the count > 0 check since below already has it implicitly.

> -       if (ret == 2) {
> -               hw_margin_max = hw_margin[1];
> -               hw_margin_min = hw_margin[0];
> +               if (count == 1)
> +                       hw_margin_max = hw_margin[0];
> +
> +               if (count == 2) {
> +                       hw_margin_max = hw_margin[1];
> +                       hw_margin_min = hw_margin[0];
> +               }
>         }

-- 
With Best Regards,
Andy Shevchenko