linux-kernel - Re: [PATCH v7 8/8] iio: adc: ad7606: add support for AD7606C-{16,18} parts

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Message-ID: <20241006115643.7b1fd461@jic23-huawei>
Date: Sun, 6 Oct 2024 11:56:43 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Alexandru Ardelean <aardelean@...libre.com>, David Lechner
 <dlechner@...libre.com>, <linux-iio@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
 <krzk+dt@...nel.org>, <robh@...nel.org>, <lars@...afoo.de>,
 <michael.hennerich@...log.com>, <gstols@...libre.com>
Subject: Re: [PATCH v7 8/8] iio: adc: ad7606: add support for
 AD7606C-{16,18} parts

On Fri, 4 Oct 2024 14:54:30 +0100
Jonathan Cameron <Jonathan.Cameron@...wei.com> wrote:

> On Wed, 2 Oct 2024 09:12:09 +0300
> Alexandru Ardelean <aardelean@...libre.com> wrote:
> 
> > On Tue, Oct 1, 2024 at 9:41 PM Jonathan Cameron <jic23@...nel.org> wrote:  
> > >
> > > On Tue, 1 Oct 2024 08:42:23 -0500
> > > David Lechner <dlechner@...libre.com> wrote:
> > >    
> > > > On 10/1/24 3:26 AM, Alexandru Ardelean wrote:    
> > > > > On Thu, Sep 19, 2024 at 4:05 PM Alexandru Ardelean
> > > > > <aardelean@...libre.com> wrote:    
> > > > >>    
> > > >
> > > > ...
> > > >    
> > > > >> @@ -153,7 +349,19 @@ static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch,
> > > > >>         if (ret)
> > > > >>                 goto error_ret;
> > > > >>
> > > > >> -       *val = sign_extend32(st->data[ch], 15);
> > > > >> +       chan = &indio_dev->channels[ch + 1];
> > > > >> +       if (chan->scan_type.sign == 'u') {
> > > > >> +               if (storagebits > 16)
> > > > >> +                       *val = st->data.buf32[ch];
> > > > >> +               else
> > > > >> +                       *val = st->data.buf16[ch];
> > > > >> +               return 0;    
> > > > >
> > > > > Arrggh...
> > > > > I messed up here.
> > > > > Guillaume found a bug here, where this should be "goto error_ret" or
> > > > > do an "if ()  {} else {}"
> > > > > How should we do it here?    
> > > if / else. Goto an error label when it's not an error would be horrible!    
> > > > >
> > > > > Do we send a fix-patch or send a new series?
> > > > >    
> > > >
> > > > Since this patch is already applied, just follow up with another
> > > > patch with a Fixes: tag.    
> > >
> > > I sometimes tweak these sort of things if I haven't pushed out
> > > as togreg yet (or they are really bad!) but in this case I'm not
> > > 100% sure what the comment is, so I'll just apply a fix on top.
> > >
> > > So David is entirely correct in general but by luck of timing
> > > this time I'll tweak it.
> > >
> > > Please check the result in iio.git/testing
> > > I'll hold off pushing that out as togreg until at least end of
> > > tomorrow.  One more day o    
> > 
> > The "return 0" needs to be removed in the driver.
> > 
> >         if (chan->scan_type.sign == 'u') {
> >                 if (storagebits > 16)
> >                         *val = st->data.buf32[ch];
> >                 else
> >                         *val = st->data.buf16[ch];
> > -                return 0;  
> Doh!.   Just goes to show why I shouldn't just edit these things.
> Stupid mistake.  I'll fix when on right machine.
hopefully now done

J
> 
> Jonathan
> 
> >         } else {
> >                 if (storagebits > 16)
> >                         *val = sign_extend32(st->data.buf32[ch], 17);
> >                 else
> >                         *val = sign_extend32(st->data.buf16[ch], 15);
> >         }
> > 
> > 
> >   
> > >
> > > Jonathan
> > >
> > >    
> > > >
> > > >
> > > >    
> > >    
> >   
>