linux-kernel - Re: [PATCH v2 1/7] dt-bindings: pwm: allwinner: Add H6 PWM description

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Date:   Tue, 5 Nov 2019 18:32:08 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>, linux-pwm@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH v2 1/7] dt-bindings: pwm: allwinner: Add H6 PWM
 description

On Tue, Nov 05, 2019 at 01:34:37PM +0100, Clément Péron wrote:
> On Tue, 5 Nov 2019 at 12:11, Maxime Ripard <mripard@...nel.org> wrote:
> >
> > Hi Clement, Uwe,
> >
> > On Mon, Nov 04, 2019 at 09:03:59AM +0100, Uwe Kleine-König wrote:
> > > On Sun, Nov 03, 2019 at 09:33:28PM +0100, Clément Péron wrote:
> > > > From: Jernej Skrabec <jernej.skrabec@...l.net>
> > > >
> > > > H6 PWM block is basically the same as A20 PWM, except that it also has
> > > > bus clock and reset line which needs to be handled accordingly.
> > > >
> > > > Expand Allwinner PWM binding with H6 PWM specifics.
> > > >
> > > > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> > > > Signed-off-by: Clément Péron <peron.clem@...il.com>
> > > > ---
> > > >  .../bindings/pwm/allwinner,sun4i-a10-pwm.yaml | 45 ++++++++++++++++++-
> > > >  1 file changed, 44 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/pwm/allwinner,sun4i-a10-pwm.yaml b/Documentation/devicetree/bindings/pwm/allwinner,sun4i-a10-pwm.yaml
> > > > index 0ac52f83a58c..bf36ea509f31 100644
> > > > --- a/Documentation/devicetree/bindings/pwm/allwinner,sun4i-a10-pwm.yaml
> > > > +++ b/Documentation/devicetree/bindings/pwm/allwinner,sun4i-a10-pwm.yaml
> > > > @@ -30,13 +30,46 @@ properties:
> > > >        - items:
> > > >            - const: allwinner,sun50i-h5-pwm
> > > >            - const: allwinner,sun5i-a13-pwm
> > > > +      - const: allwinner,sun50i-h6-pwm
> > > >
> > > >    reg:
> > > >      maxItems: 1
> > > >
> > > > -  clocks:
> > > > +  # Even though it only applies to subschemas under the conditionals,
> > > > +  # not listing them here will trigger a warning because of the
> > > > +  # additionalsProperties set to false.
> > > > +  clocks: true
> > > > +  clock-names: true
> > > > +  resets:
> > > >      maxItems: 1
> > > >
> > > > +  if:
> > > > +    properties:
> > > > +      compatible:
> > > > +        contains:
> > > > +          const: allwinner,sun50i-h6-pwm
> > > > +
> > > > +  then:
> > > > +    properties:
> > > > +      clocks:
> > > > +        items:
> > > > +          - description: Module Clock
> > > > +          - description: Bus Clock
> > > > +
> > > > +      clock-names:
> > > > +        items:
> > > > +          - const: mod
> > > > +          - const: bus
> > > > +
> > > > +    required:
> > > > +      - clock-names
> > > > +      - resets
> > > > +
> > > > +  else:
> > > > +    properties:
> > > > +      clocks:
> > > > +        maxItems: 1
> > > > +
> > >
> > > I guess this hunk says "If this is a allwinner,sun50i-h6-pwm, a mod and
> > > bus clock is required.", right?
> > >
> > > I wonder if it is sensible to require a clock-names property in the else
> > > branch, too. This would make it obvious if the clock there corresponds
> > > to the "mod" or the "bus" clock on H6. (I guess it's "mod".)
> >
> > This can be done a bit differently and could address your concerns
> >
> > Something like
> >
> > properties:
> >   ...
> >
> >   clocks:
> >     minItems: 1
> >     maxItems: 2
> >     items:
> >       - description: Bus Clock
> >       - description: Module Clock
> >
> > required:
> >   - clocks
> >
> > if:
> >   ...
> >
> > then:
> >   properties:
> >     clocks:
> >       maxItems: 2
>
> Here we should set minItems to 2 right ?
> so Max = Min = 2

It's done automatically by the tooling when the other is missing.

Maxime