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

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Date:   Mon, 12 Aug 2019 17:39:42 -0600
From:   Rob Herring <robh@...nel.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Paul Cercueil <paul@...pouillou.net>,
        Thierry Reding <thierry.reding@...il.com>,
        Mark Rutland <mark.rutland@....com>, od@...c.me,
        Linux PWM List <linux-pwm@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/6] dt-bindings: Remove unused compatible strings

On Thu, Aug 8, 2019 at 2:28 AM Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> wrote:
>
> 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@...pouillou.net>
> > > ---
> > >
> > > 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?

It won't be my problem when you find and need to handle any of the
differences in the driver.

Rob