[PATCH 2/4] iio: light: stk3310: Implement vdd supply and power it off during suspend

[Andy Shevchenko]

On Sun, Apr 14, 2024 at 8:57 PM Aren Moynihan <aren at peacevolution.org> wrote:
>
> From: Ondrej Jirman <megi at xff.cz>
>
> VDD power input can be used to completely power off the chip during
> system suspend. Do so if available.

...

>  #include <linux/iio/events.h>
>  #include <linux/iio/iio.h>
>  #include <linux/iio/sysfs.h>

> +#include <linux/regulator/consumer.h>

Move it to be ordered and add a blank line to separate iio/*.h group.

...

> +       data->vdd_reg = devm_regulator_get_optional(&client->dev, "vdd");
> +       if (IS_ERR(data->vdd_reg)) {
> +               ret = PTR_ERR(data->vdd_reg);
> +               if (ret == -ENODEV)
> +                       data->vdd_reg = NULL;

> +               else

Redundant 'else' when you follow the pattern "check for error condition first".

> +                       return dev_err_probe(&client->dev, ret,
> +                                            "get regulator vdd failed\n");
> +       }

...

> +       if (data->vdd_reg) {
> +               ret = regulator_enable(data->vdd_reg);
> +               if (ret)
> +                       return dev_err_probe(&client->dev, ret,
> +                                            "regulator vdd enable failed\n");
> +
> +               usleep_range(1000, 2000);

fsleep()

> +       }

...

>         stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
> +       if (data->vdd_reg)
> +               regulator_disable(data->vdd_reg);

I forgot to check the order of freeing resources, be sure you have no
devm_*() releases happening before this call.

...

> +               usleep_range(1000, 2000);

fsleep()

-- 
With Best Regards,
Andy Shevchenko