linux-kernel - Re: [PATCH -next] iio:ad7797: Use correct attribute

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Date:   Sat, 7 Mar 2020 13:10:26 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
Cc:     "stefan.popa@...log.com" <stefan.popa@...log.com>,
        "Jonathan.Cameron@...wei.com" <Jonathan.Cameron@...wei.com>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "knaack.h@....de" <knaack.h@....de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "yuehaibing@...wei.com" <yuehaibing@...wei.com>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH -next] iio:ad7797: Use correct attribute_group

On Wed, 4 Mar 2020 06:35:28 +0000
"Ardelean, Alexandru" <alexandru.Ardelean@...log.com> wrote:

> On Mon, 2020-03-02 at 21:32 +0800, YueHaibing wrote:
> > [External]
> > 
> > It seems ad7797_attribute_group should be used in ad7797_info,
> > according to commit ("iio:ad7793: Add support for the ad7796 and ad7797").  
> 
> While the change looks good at first, I am thinking that this might introduce
> another issue while fixing this one.
> 
> It looks like the ad7797_attributes[] array may also require the
> &iio_dev_attr_in_m_in_scale_available.dev_attr.attr attribute as well.
> It looks like the available scales should be printed for AD7997 as well.
> 
> That being said, this patch is fine as-is.
> But it would require a patch [before-this-patch] to fix the ad7797_attributes
> array.
> 
> Something like this:
> 
> static struct attribute *ad7797_attributes[] = {
>         &iio_const_attr_sampling_frequency_available_ad7797.dev_attr.attr,
> +       &iio_dev_attr_in_m_in_scale_available.dev_attr.attr,
>        NULL
> };
> 
> I'm hoping I'm right about this one. I sometimes don't notice things too well.

Agreed. Should have that addition as well.  If not we'll successfully fix
one issue but drop a valid interface at the same time...

Thanks,

Jonathan

> 
> > 
> > Fixes: fd1a8b912841 ("iio:ad7793: Add support for the ad7796 and ad7797")
> > Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> > ---
> >  drivers/iio/adc/ad7793.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
> > index b747db9..e5691e3 100644
> > --- a/drivers/iio/adc/ad7793.c
> > +++ b/drivers/iio/adc/ad7793.c
> > @@ -542,7 +542,7 @@ static const struct iio_info ad7797_info = {
> >  	.read_raw = &ad7793_read_raw,
> >  	.write_raw = &ad7793_write_raw,
> >  	.write_raw_get_fmt = &ad7793_write_raw_get_fmt,
> > -	.attrs = &ad7793_attribute_group,
> > +	.attrs = &ad7797_attribute_group,
> >  	.validate_trigger = ad_sd_validate_trigger,
> >  };
> >