Re: [PATCH v1 10/11] watchdog: bd9576_wdt: switch to using devm_fwnode_gpiod_get()

[Andy Shevchenko]

On Mon, Sep 5, 2022 at 9:33 AM Dmitry Torokhov
<dmitry.torokhov@xxxxxxxxx> 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