linux-kernel - Re: [PATCH v3 2/4] iio: industrialio-backend: support backend capabilities

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Message-ID: <f8fbb23a-b197-46dc-b32d-10c37434c67c@vaisala.com>
Date: Tue, 20 Jan 2026 08:45:41 +0200
From: Tomas Melin <tomas.melin@...sala.com>
To: David Lechner <dlechner@...libre.com>, Nuno Sá
 <noname.nuno@...il.com>, Michael Hennerich <Michael.Hennerich@...log.com>,
 Nuno Sa <nuno.sa@...log.com>, Lars-Peter Clausen <lars@...afoo.de>,
 Jonathan Cameron <jic23@...nel.org>, Andy Shevchenko <andy@...nel.org>,
 Olivier Moysan <olivier.moysan@...s.st.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] iio: industrialio-backend: support backend
 capabilities

Hi,

On 19/01/2026 17:00, David Lechner wrote:
> On 1/19/26 7:49 AM, Tomas Melin wrote:
> 
> ...
> 
>>>>  int iio_backend_chan_enable(struct iio_backend *back, unsigned int chan);
>>>> @@ -235,6 +251,7 @@ int iio_backend_read_raw(struct iio_backend *back,
>>>>  			 long mask);
>>>>  int iio_backend_extend_chan_spec(struct iio_backend *back,
>>>>  				 struct iio_chan_spec *chan);
>>>> +int iio_backend_has_caps(struct iio_backend *back, u32 caps);
>>>
>>> Not what David suggested and I do agree with him FWIW.
>> AFAIU this was exactly what was suggested. Citing:
> 
> Slight difference. Should return bool instead of int.
Yes absolutely, perhaps it was about the signature. That is on the
change list for next version.

Thanks,
Tomas

> 
>>
>>>> bool iio_backend_has_capabilities(struct iio_backend *back, u32 flags)
>>>> (caps is fine too if we want to keep it short)
>>
>> Using the longer format is not very practical. Can we keep it as
>> iio_backend_has_caps ?
> 
> Yes, I said as much already. But I guess you are asking Nuno. ;-)