On Mon Dec 4, 2023 at 1:52 PM CET, Conor Dooley wrote: > On Mon, Dec 04, 2023 at 02:40:44PM +0200, Markuss Broks wrote: > > On 12/3/23 13:20, Conor Dooley wrote: > > > On Sat, Dec 02, 2023 at 01:48:33PM +0100, Karel Balej wrote: > > > > From: Markuss Broks <markuss.broks@xxxxxxxxx> > > > > > > > > Imagis IST3038B is a variant (firmware?) of Imagis IST3038 IC, > > > > add the compatible for it to the IST3038C bindings. > > > This one is better, but would be well served by mentioning what > > > specifically is different (register addresses or firmware commands?) > > > > I don't think anyone knows this other than Imagis itself. I would guess it's > > different hardware, since register addresses are indeed different, but on > > the other hand, there is a possibility that firmware on the MCU could be > > responding to those commands. I suppose "... IST3038B is a hardware variant > > of ... IST3038" would be more correct. > > Only Imagis might know the specifics, but you (plural) have made driver > changes so you know what is different in terms of the programming model. > I'm just asking for you to mention how the programming model varies in > the commit message. Otherwise I can't know whether you should have added > a fallback compatible, without going and reading your driver change. The > commit message for the bindings should stand on its own merit in that > regard. > "Variant" alone does not suffice, as many variants of devices have a > compatible programming model, be that for a subset of features or > complete compatibility. > > > The reason why I think it could be firmware-defined is because we have a lot > > of variants (30xxA, 30xxB, 30xxC, plain 30xx), and the numbers usually mean > > feature level/completeness, e.g. some don't support the touch pressure or > > touchkeys, and we don't know what A/B/C/none means. > > Ultimately whether it is due to firmware or the hardware isn't > particular important, just mention what is incompatibly different. I propose to update the commit description as such: Imagis IST3038B is a variant (firmware?) of Imagis IST3038 IC differing from IST3038C in its register interface. Add the compatible for it to the IST3038C bindings. > > Cheers, > Conor. > > > > > > Signed-off-by: Markuss Broks <markuss.broks@xxxxxxxxx> > > > > Signed-off-by: Karel Balej <balejk@xxxxxxxxx> > > > > --- > > > > .../devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml | 1 + > > > > 1 file changed, 1 insertion(+) > > > > > > > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml b/Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml > > > > index 0d6b033fd5fb..b5372c4eae56 100644 > > > > --- a/Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml > > > > +++ b/Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml > > > > @@ -18,6 +18,7 @@ properties: > > > > compatible: > > > > enum: > > > > + - imagis,ist3038b > > > > - imagis,ist3038c > > > > reg: > > > > -- > > > > 2.43.0 > > > > > > - Markuss Kind regards, K. B.
