linux-kernel - Re: [PATCH v4 2/3] iio: add MEMSensing MSA311 3-axis accelerometer driver

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Message-ID: <20220809095251.vpp6arac3pkntdlo@CAB-WSD-L081021.sigma.sbrf.ru>
Date:   Tue, 9 Aug 2022 09:52:49 +0000
From:   Dmitry Rokosov <DDRokosov@...rdevices.ru>
To:     Jonathan Cameron <jic23@...nel.org>
CC:     Andy Shevchenko <andy.shevchenko@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "stano.jakubek@...il.com" <stano.jakubek@...il.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "stephan@...hold.net" <stephan@...hold.net>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] iio: add MEMSensing MSA311 3-axis accelerometer
 driver

On Sat, Aug 06, 2022 at 03:55:23PM +0100, Jonathan Cameron wrote:

[...]

> > 
> > > > +       indio_dev->modes = 0; /* setup buffered mode later */  
> > > 
> > > Why explicit assignment to 0? Doesn't kzalloc() do it for you?  
> > 
> > kzalloc() will do it for me, of course. Previously, I initialized modes to
> > INDIO_DIRECT_MODE to just provide default value for that. Jonathan
> > suggested to replace it with 0. 
> 
> I did?  I wonder what I was smoking that day. 
> Should be set to INDIO_DIRECT_MODE as you had it previously.
> 
> (From what I recall it will work either way but we have in the past had
> core code that checked this and may do again in the future so drivers should
> still be setting it to specify they provide sysfs interfaces to directly read
> the channels).

Jonathan, really sorry I referred to you. I'm confused. This comment was
from Andy in the v3 discussion:

https://lore.kernel.org/linux-iio/CAHp75Vc0+ckNnm2tzLMPrjeFRjwoj3zy0C4koNShFRG3kP8b6w@mail.gmail.com/

I will revert this change. Thank you for feedback.

-- 
Thank you,
Dmitry