On Tue, Sep 08, 2026 at 02:31:40PM +0800, Colin Huang wrote:
> Conor Dooley <conor@kernel.org> 於 2026年9月8日週二 上午1:01寫道：
> >
> > On Mon, Sep 07, 2026 at 03:03:29PM +0800, Colin Huang wrote:
> > > From: Colin Huang <u8813345@gmail.com>
> > >
> > > Add Device Tree compatible strings for Renesas RAA229639 and
> > > RAA229640 PMBus devices.
> >
> > Driver change suggests fallback compatibles could be used.
> > Why aren't they? If they can be, add them. Otherwise, explain why not in
> > your commit message.
> >
> > pw-bot: changes-requested
> >
> > Thanks,
> > Conor.
> >
> Hi Conor
>   Thanks for the review.
> 
>   I didn't add a fallback compatible because I only have document for
> RAA229639 and RAA229640
>   and could not verify full DT level compatibility with any existing
> supported devices. While both devices
>   are handled by the existing raa_dmpvr2_2rail driver variant, I don't
> have sufficient information to establish
>   a compatible fallback relationship.

Given that the match data table looks like this:
static const struct of_device_id isl68137_of_match[] = {
	{ .compatible = "isil,isl68137", .data = (void *)raa_dmpvr1_2rail },
	{ .compatible = "renesas,isl68220", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl68221", .data = (void *)raa_dmpvr2_3rail },
	{ .compatible = "renesas,isl68222", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl68223", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl68224", .data = (void *)raa_dmpvr2_3rail },
	{ .compatible = "renesas,isl68225", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl68226", .data = (void *)raa_dmpvr2_3rail },
	{ .compatible = "renesas,isl68227", .data = (void *)raa_dmpvr2_1rail },
	{ .compatible = "renesas,isl68229", .data = (void *)raa_dmpvr2_3rail },
	{ .compatible = "renesas,isl68233", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl68239", .data = (void *)raa_dmpvr2_3rail },

	{ .compatible = "renesas,isl69222", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69223", .data = (void *)raa_dmpvr2_3rail },
	{ .compatible = "renesas,isl69224", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69225", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69227", .data = (void *)raa_dmpvr2_3rail },
	{ .compatible = "renesas,isl69228", .data = (void *)raa_dmpvr2_3rail },
	{ .compatible = "renesas,isl69234", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69236", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69239", .data = (void *)raa_dmpvr2_3rail },
	{ .compatible = "renesas,isl69242", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69243", .data = (void *)raa_dmpvr2_1rail },
	{ .compatible = "renesas,isl69247", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69248", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69254", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69255", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69256", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69259", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "isil,isl69260", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,isl69268", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "isil,isl69269", .data = (void *)raa_dmpvr2_3rail },
	{ .compatible = "renesas,isl69298", .data = (void *)raa_dmpvr2_2rail },

	{ .compatible = "renesas,raa228000", .data = (void *)raa_dmpvr2_hv },
	{ .compatible = "renesas,raa228004", .data = (void *)raa_dmpvr2_hv },
	{ .compatible = "renesas,raa228006", .data = (void *)raa_dmpvr2_hv },
	{ .compatible = "renesas,raa228228", .data = (void *)raa_dmpvr2_2rail_nontc },
	{ .compatible = "renesas,raa228244", .data = (void *)raa_dmpvr2_2rail_nontc },
	{ .compatible = "renesas,raa228246", .data = (void *)raa_dmpvr2_2rail_nontc },
	{ .compatible = "renesas,raa229001", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,raa229004", .data = (void *)raa_dmpvr2_2rail },
	{ .compatible = "renesas,raa229621", .data = (void *)raa_dmpvr2_2rail },
	{ },
};

It's probably pretty safe to assume that a fallback would work here,
given how many devices are served by the same data structures but
maybe one of the Renesas folks on CC can confirm that for us.
At the very least, you have documents for two devices and should be able
to confirm if they're compatible with one another.

Thanks,
Conor.

> 
>   I will clarify this in commit message in v2.
> 
> Thanks.
> Colin
> > >
> > > Signed-off-by: Colin Huang <u8813345@gmail.com>
> > > ---
> > >  Documentation/devicetree/bindings/hwmon/pmbus/isil,isl68137.yaml | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/isil,isl68137.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/isil,isl68137.yaml
> > > index 8216cdf758d8..3537c7ddfb09 100644
> > > --- a/Documentation/devicetree/bindings/hwmon/pmbus/isil,isl68137.yaml
> > > +++ b/Documentation/devicetree/bindings/hwmon/pmbus/isil,isl68137.yaml
> > > @@ -60,6 +60,8 @@ properties:
> > >            - renesas,raa229001
> > >            - renesas,raa229004
> > >            - renesas,raa229621
> > > +          - renesas,raa229639
> > > +          - renesas,raa229640
> > >
> > >        - items:
> > >            - enum:
> > >
> > > --
> > > 2.34.1
> > >