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

[Guenter Roeck]

On 9/5/22 04:09, Andy Shevchenko wrote:
> On Mon, Sep 5, 2022 at 9:33 AM Dmitry Torokhov
> <dmitry.torokhov at gmail.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).
> 

Two checks will always be needed, so I don't entirely see
how that would be better.

> ...
> 
>> -       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.
> 
Sorry, I don't understand this comment.

Guenter

>> -       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];
>> +               }
>>          }
>