linux-kernel - Re: [PATCH v2 1/5] dt-bindings: net: can: renesas,rcar-canfd: Document RZ/G2L SoC

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Message-ID: <CAMuHMdVFarkF49=Vvcv-6NLhxbLUE33PXnqhAiPxpaCNN7u4Bw@mail.gmail.com>
Date:   Tue, 20 Jul 2021 17:11:42 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-can@...r.kernel.org,
        netdev <netdev@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 1/5] dt-bindings: net: can: renesas,rcar-canfd:
 Document RZ/G2L SoC

Hi Prabhakar,

On Tue, Jul 20, 2021 at 4:31 PM Lad, Prabhakar
<prabhakar.csengg@...il.com> wrote:
> On Tue, Jul 20, 2021 at 11:22 AM Philipp Zabel <p.zabel@...gutronix.de> wrote:
> > On Mon, 2021-07-19 at 15:38 +0100, Lad Prabhakar wrote:
> > > Add CANFD binding documentation for Renesas RZ/G2L SoC.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>

> > > --- a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> > > +++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml

> > > +    resets:
> > > +      items:
> > > +        - description: CANFD_RSTP_N
> > > +        - description: CANFD_RSTC_N
> >
> > Do you know what the "P" and "C" stands for? It would be nice if the
> > description could tell us what the reset lines are used for.
> >
> unfortunately the HW manual does not mention  anything about "P" and "C" :(
>
> > I would prefer if you used these names (or shortened versions, for
> > example "rstp_n", "rstc_n") as "reset-names" and let the driver
> > reference the resets by name instead of by index.
> >
> OK will do that and maxItems:2 for resets.
>
> @Geert, for R-Car Gen3 does "canfd_rst" (as it's a module reset)
> sounds good for reset-names? Or do you have any other suggestions?

I wouldn't bother with reset-names on R-Car, as there is only a
single reset.

BTW, does there exist a generally-accepted reset-equivalent of "fck"
("Functional ClocK")?

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