linux-kernel - RE: [PATCH v2 2/3] media: dt-bindings: media: renesas,drif: Convert to json-schema

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Message-ID: <OSAPR01MB27407BFEBF870A5F3DB40D15C2380@OSAPR01MB2740.jpnprd01.prod.outlook.com>
Date:   Wed, 23 Sep 2020 14:08:41 +0000
From:   Fabrizio Castro <fabrizio.castro.jz@...esas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Ramesh Shanmugasundaram <rashanmu@...il.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: RE: [PATCH v2 2/3] media: dt-bindings: media: renesas,drif: Convert
 to json-schema

Hi Geert,

Thank you for getting back to me.

> From: Geert Uytterhoeven <geert@...ux-m68k.org>
> Sent: 23 September 2020 14:33
>
> Hi Fabrizio,
>
> On Wed, Sep 23, 2020 at 1:55 PM Fabrizio Castro
> <fabrizio.castro.jz@...esas.com> wrote:
> > > From: Geert Uytterhoeven <geert@...ux-m68k.org>
> > > On Wed, Sep 16, 2020 at 1:00 PM Fabrizio Castro
> > > <fabrizio.castro.jz@...esas.com> wrote:
> > > > Convert the Renesas DRIF bindings to DT schema and update
> > > > MAINTAINERS accordingly.
> > > >
> > > > Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
>
> > > > +if:
> > > > +  required:
> > > > +    - renesas,primary-bond
> > > > +then:
> > > > +  required:
> > > > +    - pinctrl-0
> > > > +    - pinctrl-names
> > > > +    - port
> > >
> > > The last 3 properties must not be present for a secondary interface,
> > > right?
> >
> > If you have both channels enabled, then one of the two has to define
> properties:
> > * renesas,primary-bond, pinctrl-0, pinctrl-names, and port.
> >
> > If only one channel is enabled, then the primary bond concept loses its
> value,
> > whether renesas,primary-bond is specified or not doesn’t matter anymore,
> but the
> > enabled node has to specify the pinctrl related properties and the port.
> >
> > > To express that, I think you need to add:
> > >
> > >     else:
> > >       properties:
> > >         - pinctrl-0: false
> > >         - pinctrl-names: false
> > >         - port: false
> >
> > If I went with this, we would not be able to allow those properties to be
> specified in the
> > only enabled node for single channels configurations.
> >
> > Is there a better way to approach this?
> >
> > I'll wait for this point to get sorted before sending v3 out.
>
> The old binding said:
>
>     -Required properties of an internal channel when:
>     -       - It is the only enabled channel of the bond (or)
>     -       - If it acts as primary among enabled bonds
>
>     -- renesas,primary-bond: empty property indicating the channel
> acts as primary
>     -                       among the bonded channels.
>
> so renesas,primary-bond is required for the only enabled node for
> single channels configurations anyway?

The old binding also said:
"
When only one of the bonded channels need to be enabled, the property
"renesas,bonding" or "renesas,primary-bond" will have no effect. That
enabled channel can act alone as any other independent device.
"

If you then look at the driver implementation, the renesas,primary-bond
property doesn’t get evaluated if you have only one channel enabled.

Thanks,
Fab

>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-
> m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds


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