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

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Date:   Mon, 9 Mar 2020 11:12:48 +0100
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Yuehaibing <yuehaibing@...wei.com>,
        Jonathan Cameron <jic23@...nel.org>,
        "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>,
        "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 3/9/20 2:38 AM, Yuehaibing wrote:
> On 2020/3/7 21:10, Jonathan Cameron wrote:
>> 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...
>>
> Ok, will send v2 with this addtion, thanks!
>
I believe the original patch is OK the way it was. The part does not 
have a programmable gain, hence should not have the scale_available 
attribute.

You can add my reviewed by to the original patch.

Reviewed-by: Lars-Peter Clausen <lars@...afoo.de>

- Lars