linux-kernel - Re: [PATCH v5] iio: add ad5761 DAC driver

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Message-ID: <CAPybu_1oPAVtEyTOj6urZagvBf67Q8qwRC6vTsLa=Agi8t3f8A@mail.gmail.com>
Date:	Mon, 11 Jan 2016 17:23:27 +0100
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Jonathan Cameron <jic23@...nel.org>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Hartmut Knaack <knaack.h@....de>,
	Peter Meerwald <pmeerw@...erw.net>, linux-iio@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] iio: add ad5761 DAC driver

Hello Jonathan

Thanks for your review

On Sat, Jan 9, 2016 at 5:15 PM, Jonathan Cameron <jic23@...nel.org> wrote:
> I'm a little unsure that we shouldn't just fail the probe if the
> range is supplied.  Even the default (the best option available)
> could in theory do damage to a circuit with a maximum of 3V though
> it's probably unlikely...

I personally hate when a driver needs a mandatory pdata. I expect a
default behaviour on the absence of it.

>> +     st->vref_reg = devm_regulator_get_optional(&st->spi->dev, "vref");
>> +     if (!st->vref_reg || PTR_ERR(st->vref_reg) == -ENODEV) {
> This is a little unusual... Only one of those errors is returned by
> devm_regulator_get_optional if the regulator is not specified.
> I believe from a quick look at the regulator code that it returns the
> -ENODEV part.
>
> So how can it be null?
>

After a fast look:

devm_regulator_get_optional-> _devm_regulator_get -> regulator_get
(regulator/consumer.h)

Probably consumer.h cannot be reached at the same time than
_devm_regulator_get. But for safety I rather leave the check.



I send v6 right away.


Thanks!



-- 
Ricardo Ribalda