linux-kernel - Re: [PATCH 2/5] iio: temperature: mcp9600: Share scale by all channels

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Date: Tue, 30 Apr 2024 14:23:50 +0200
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Andrew Hepp <andrew.hepp@...pp.dev>,
	Marcelo Schmitt <marcelo.schmitt1@...il.com>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] iio: temperature: mcp9600: Share scale by all
 channels

Am Tue, Apr 30, 2024 at 01:09:34PM +0100 schrieb Jonathan Cameron:
> On Tue, 30 Apr 2024 14:05:32 +0200
> Dimitri Fedrau <dima.fedrau@...il.com> wrote:
> 
> > Move bit IIO_CHAN_INFO_SCALE from info_mask_separate to
> > info_mask_shared_by_all since temperature format is the same for all
> > channels.
> > 
> > Signed-off-by: Dimitri Fedrau <dima.fedrau@...il.com>
> 
> Whilst this shouldn't be a problem for well behaved userspace,
> it is an ABI change so as a general rule we don't 'fix' cases like
> this once they have been in a kernel release.
> 
> We may be break someone's hand crafted scripts :(
>
Ok, will remove the patch from the series.

Best regards,
Dimitri Fedrau

> 
> > ---
> >  drivers/iio/temperature/mcp9600.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/iio/temperature/mcp9600.c b/drivers/iio/temperature/mcp9600.c
> > index e277edb4ae4b..74e0782fb073 100644
> > --- a/drivers/iio/temperature/mcp9600.c
> > +++ b/drivers/iio/temperature/mcp9600.c
> > @@ -28,16 +28,16 @@ static const struct iio_chan_spec mcp9600_channels[] = {
> >  		.address = MCP9600_HOT_JUNCTION,
> >  		.channel2 = IIO_MOD_TEMP_OBJECT,
> >  		.modified = 1,
> > -		.info_mask_separate =
> > -			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> > +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> > +		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE),
> >  	},
> >  	{
> >  		.type = IIO_TEMP,
> >  		.address = MCP9600_COLD_JUNCTION,
> >  		.channel2 = IIO_MOD_TEMP_AMBIENT,
> >  		.modified = 1,
> > -		.info_mask_separate =
> > -			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> > +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> > +		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE),
> >  	},
> >  };
> >  
>