Re: [PATCH v3 5/7] dt-bindings: iio: bosch,bme680: Add supply properties

[Vasileios Amoiridis <vassilisamir@gmail.com>]

On Mon, Nov 04, 2024 at 10:10:33AM -0600, Rob Herring wrote:
> On Sun, Nov 03, 2024 at 10:46:46AM +0100, Krzysztof Kozlowski wrote:
> > On Sat, Nov 02, 2024 at 03:33:15PM +0000, Jonathan Cameron wrote:
> > > On Sat,  2 Nov 2024 14:13:09 +0100
> > > Vasileios Amoiridis <vassilisamir@gmail.com> wrote:
> > > 
> > > > Extend dt-binding for BME680 gas sensor device. The device incorporates
> > > > as well temperature, pressure and relative humidity sensors.
> > > This description should make it clear it is moving from trivial-devices.yaml
> > > 
> > > dt-bindings: iio: bosch,bme680: Move from trivial-bindings and add missing supplies.
> > > 
> > > Then say a little more on why you are moving it.
> > > 
> > > > 
> > > > Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>
> > > 
> > > There was an open question on the previous version about
> > > setting the supplies as required (which I see you've removed).
> > > My understanding previously was that it is fine to make that change
> > > in a binding if it reflects supplies that are required to be enabled
> > > for the device to function at all.  If there were previously missing
> > > that's a binding bug we should fix.
> > > 
> > > I'd like a clarification from the DT binding maintainers on that.
> > > Obviously doesn't work for other users of dt bindings but in
> > > Linux this would be fine as they were already on for any board
> > > that worked and the regulator framework will through us a fake
> > > regulator for cases like this.
> > > 
> > > https://lore.kernel.org/all/20241022182451.00007ac0@Huawei.com/
> > > 
> > > Jonathan
> > 
> > That was Rob's objection so I will leave it to him, but putting my two
> > cents in for Linux it is not an ABI break because missing regulator
> > supplies are substituted with dummy ones. Unless something changed...
> 
> Shrug. I don't think we're entirely consistent on this. If we're saying 
> supplies are always required, then every device in trivial-devices.yaml 
> is wrong. Since Linux handles them missing, you can also argue that 
> supplies are never required.
> 
> I'd prefer not to special case regulators as an exception I have to 
> remember. I have some rudimentary ABI checking I'm working on that 
> checks for things like new required properties. Though it wouldn't catch 
> this particular change given it moves the schema.
> 
> Rob

Hi Jonathan,

According to Rob's answer, do you think that we can move on with the
last 3 patches as they are or do you want some changes?

Cheers,
Vasilis