Re: [PATCH 1/2] dt-bindings: iio: ti,tmp117: add binding for the TMP119

[Romain Gantois <romain.gantois@bootlin.com>]

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On Friday, 5 June 2026 16:20:05 CEST Jonathan Cameron wrote:
> On Fri, 05 Jun 2026 14:24:45 +0200
...
> > 
> > > The second patch then just resolves the print that would happen on older
> > > kernels using that fallback due to ID mismatch.  That's fine but nice
> > > if older kernels can work with this part.
> > 
> > Sorry I don't quite understand: since this is a feature patch, I don't
> > expect it would get backported onto older kernels. Therefore why would
> > the second patch resolve the print happening on older kernels?
> 
> The point of a fallback compatible is that we don't have to backport
> anything. New device tree comes along that lists
> 
> compatible = "ti,tmp119", "ti,tmp117"
> 
> will just work. Older kernel will think it has a tmp117 which is fine as
> they are register interface compatible.  It will print a message to say
> that it found an unknown ID but then assume it is what the firmware told
> it, here the tmp117 fallback.  With your second patch in place, that
> harmless message will disappear for new kernels.

Ok I understand, thanks for the explanation.

Thanks,

-- 
Romain Gantois, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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