Re: [PATCH v2 1/6] dt-bindings: Remove unused compatible strings

[Uwe Kleine-König]

On Mon, Jul 08, 2019 at 08:04:25PM -0600, Rob Herring wrote:
> On Fri, Jun 07, 2019 at 05:44:05PM +0200, Paul Cercueil wrote:
> > Right now none of the Ingenic-based boards probe this driver from
> > devicetree. This driver defined three compatible strings for the exact
> > same behaviour. Before these strings are used, we can remove two of
> > them.
> > 
> > Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
> > ---
> > 
> > Notes:
> >     v2: Rebase on v5.2-rc3
> > 
> >  Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt | 5 +----
> >  1 file changed, 1 insertion(+), 4 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt b/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
> > index 7d9d3f90641b..493bec80d59b 100644
> > --- a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
> > +++ b/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
> > @@ -2,10 +2,7 @@ Ingenic JZ47xx PWM Controller
> >  =============================
> >  
> >  Required properties:
> > -- compatible: One of:
> > -  * "ingenic,jz4740-pwm"
> > -  * "ingenic,jz4770-pwm"
> > -  * "ingenic,jz4780-pwm"
> > +- compatible: Should be "ingenic,jz4740-pwm"
> 
> Are you sure all 3 chips are exactly the same features and bugs?
> 
> The correct thing to do here generally is the 4770 and 4780 would also 
> have ingenic,jz4740-pwm as a fallback compatible. Then the driver can 
> match on that until you find some difference and can use the more 
> specific compatible.

Note that Thierry already applied this patch before your concern reached
the mailing list. Is this bad enough to revert
925488e8df4f396ad96ff008a84f5b14d8b73347?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |