linux-kernel - Re: [PATCH v4] iio: adc: Add TI ADS1015 ADC driver support

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Message-ID: <20160301013303.GA18806@deathstar>
Date:	Mon, 29 Feb 2016 19:33:03 -0600
From:	Michael Welling <mwelling@...e.org>
To:	Lucas De Marchi <lucas.de.marchi@...il.com>
Cc:	Daniel Baluta <daniel.baluta@...el.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	lkml <linux-kernel@...r.kernel.org>, linux-iio@...r.kernel.org,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Guenter Roeck <linux@...ck-us.net>, eibach@...ys.de
Subject: Re: [PATCH v4] iio: adc: Add TI ADS1015 ADC driver support

On Mon, Feb 29, 2016 at 10:09:10PM -0300, Lucas De Marchi wrote:
> On Mon, Feb 29, 2016 at 9:50 PM, Michael Welling <mwelling@...e.org> wrote:
> > On Fri, Feb 05, 2016 at 03:17:18PM +0200, Daniel Baluta wrote:
> >> The driver has sysfs readings with runtime PM support for power saving.
> >> It also offers buffer support that can be used together with IIO software
> >> triggers.
> >>
> >
> > Daniel,
> >
> > So I noticed something yesterday while testing new boards.
> > The channels are occassionally swapping when accessing data from multiple channels.
> >
> > I wrote a simple bash script to demonstrate.
> 
> This happened to me in a previous version of the patch. I remember it
> being fixed in the last version (or at least I could not reproduce).
> I'll test again tomorrow with your script.
>

Just verified that it is happening to me will the latest in linux-next.

root@...gonboard-410c:~# cat /proc/version 
Linux version 4.5.0-rc6-next-20160229+ (michael@...thstar) (gcc version 5.2.0 (GCC) ) #1 SMP PREEMPT Mon Feb 29 19:27:11 CST 2016
root@...gonboard-410c:~# ./test-analog.sh 
ain0 = 267 ain1 = 286 ain2 = 268 ain3 = 288
ain0 = 283 ain1 = 284 ain2 = 284 ain3 = 0
ain0 = 0 ain1 = 284 ain2 = 287 ain3 = 0
ain0 = 0 ain1 = 285 ain2 = 287 ain3 = 0
ain0 = 282 ain1 = 284 ain2 = 287 ain3 = 0
ain0 = 283 ain1 = 284 ain2 = 286 ain3 = 0
ain0 = 283 ain1 = 290 ain2 = 285 ain3 = 288
ain0 = 284 ain1 = 286 ain2 = 285 ain3 = 0
ain0 = 0 ain1 = 284 ain2 = 285 ain3 = 0
ain0 = 0 ain1 = 286 ain2 = 287 ain3 = 0
ain0 = 0 ain1 = 284 ain2 = 289 ain3 = 0
.
.
 
> Lucas De Marchi