linux-kernel - Re: [PATCH v3 2/3] staging: iio: ad7780: update voltage on read

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Date:   Sat, 3 Nov 2018 13:06:19 -0300
From:   Renato Lui Geh <renatogeh@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "knaack.h@....de" <knaack.h@....de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "renatogeh@...il.com" <renatogeh@...il.com>,
        "giuliano.belinassi@....br" <giuliano.belinassi@....br>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "kernel-usp@...glegroups.com" <kernel-usp@...glegroups.com>
Subject: Re: [PATCH v3 2/3] staging: iio: ad7780: update voltage on read

On Thu, 1 Nov 2018 15:20:55 +0000
"Ardelean, Alexandru" <alexandru.Ardelean@...log.com> wrote:
>
> This looks wrong.
> I admit this was done in the same way in the probe function, but that looks
> a bit wrong as well.
>
> Typically, the return value of `regulator_get_voltage()` would get checked
> with:
>
> ret = regulator_get_voltage(st->reg);
> if (ret < 0)
>    return ret;
> *val = ret / 1000;
>
> So, negative values are errors and zero & positive values are valid voltage
> values.

I see. So -EINVAL is only used when sent the wrong info type?