linux-kernel - Re: [PATCH 01/16] iio: adc: max1027: Fix wrong shift with 12-bit devices

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Message-ID: <20210830105738.472b5f69@jic23-huawei>
Date:   Mon, 30 Aug 2021 10:57:38 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     "Sa, Nuno" <Nuno.Sa@...log.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 01/16] iio: adc: max1027: Fix wrong shift with 12-bit
 devices

On Fri, 20 Aug 2021 07:02:54 +0000
"Sa, Nuno" <Nuno.Sa@...log.com> wrote:

> > -----Original Message-----
> > From: Miquel Raynal <miquel.raynal@...tlin.com>
> > Sent: Wednesday, August 18, 2021 1:11 PM
> > To: Jonathan Cameron <jic23@...nel.org>; Lars-Peter Clausen
> > <lars@...afoo.de>
> > Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>; linux-
> > iio@...r.kernel.org; linux-kernel@...r.kernel.org; Miquel Raynal
> > <miquel.raynal@...tlin.com>; stable@...r.kernel.org
> > Subject: [PATCH 01/16] iio: adc: max1027: Fix wrong shift with 12-bit
> > devices
> > 
> > [External]
> > 
> > 10-bit devices must shift the value twice.
> > This is not needed anymore on 12-bit devices.
> > 
> > Fixes: ae47d009b508 ("iio: adc: max1027: Introduce 12-bit devices
> > support")
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > ---
> >  drivers/iio/adc/max1027.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
> > index 655ab02d03d8..4a42d140a4b0 100644
> > --- a/drivers/iio/adc/max1027.c
> > +++ b/drivers/iio/adc/max1027.c
> > @@ -103,7 +103,7 @@ MODULE_DEVICE_TABLE(of,
> > max1027_adc_dt_ids);
> >  			.sign = 'u',					\
> >  			.realbits = depth,				\
> >  			.storagebits = 16,				\
> > -			.shift = 2,					\
> > +			.shift = (depth == 10) ? 2 : 0,			\
> >  			.endianness = IIO_BE,				\
> >  		},							\
> >  	}
> > --
> > 2.27.0  
> 
> Reviewed-by: Nuno Sá <nuno.sa@...log.com>
Ouch.  I briefly wondered if we should dot his as 12 - depth, but given we are unlikely
to ever see a 9 or 11 bit device and it doesn't make much sense for anything 8 or less
what you have here is effectively the same.

Applied to the fixes-togreg branch of iio.git

Jonathan

>