linux-kernel - Re: [PATCH 3/6] iio: adc: ad7173: refactor channel configuration parsing

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Date: Wed, 3 Apr 2024 10:55:11 -0500
From: David Lechner <dlechner@...libre.com>
To: "Ceclan, Dumitru" <mitrutzceclan@...il.com>
Cc: dumitru.ceclan@...log.com, Lars-Peter Clausen <lars@...afoo.de>, 
	Michael Hennerich <Michael.Hennerich@...log.com>, Jonathan Cameron <jic23@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] iio: adc: ad7173: refactor channel configuration parsing

On Wed, Apr 3, 2024 at 5:01 AM Ceclan, Dumitru <mitrutzceclan@...ilcom> wrote:
>
> On 01/04/2024 22:39, David Lechner wrote:
> > On Mon, Apr 1, 2024 at 10:10 AM Dumitru Ceclan via B4 Relay
> > <devnull+dumitru.ceclan.analog.com@...nel.org> wrote:
> >>
> >> From: Dumitru Ceclan <dumitru.ceclan@...log.com>
> >>
> >> Move configurations regarding number of channels from
> >> *_fw_parse_device_config to *_fw_parse_channel_config.
> >>
> >> Signed-off-by: Dumitru Ceclan <dumitru.ceclan@...log.com>
> >> ---
> >
> > Commit messages need to explain _why_ the change is being made [1]. It
> > is not obvious to me why this needs to be moved.
> >
> > [1]: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#the-canonical-patch-format
>
>
> Jonathan Cameron:
>
> "
> > +     if (num_channels == 0)
> > +             return dev_err_probe(dev, -ENODATA, "No channels specified\n");
> > +     indio_dev->num_channels = num_channels;
> > +     st->num_channels = num_channels;
>
> I'm not seeing benefit of duplication here really and logically it feels like
> a lot of this last chunk would sit better in ad7173_fw_parse_channel_config()
>
> Perhaps that's a job for a future tidying up patch.
> "
> https://lore.kernel.org/all/20240303162148.3ad91aa2@jic23-huawei/
>

Thanks.

A Link: and Suggested-by: in the commit message with this info would
be a reasonable way to communicate this.

I looks like this is also adding an additional check "  if
(num_channels > st->info->num_channels)" in addition to moving
existing code. It would be helpful to have the reason for this in the
commit message as well.

With the suggested additions to the commit message...
Reviewed-by: David Lechner <dlechner@...libre.com>