netdev - RE: [PATCH v 1/2] ravb: Add support for r8a7743 SoC

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Date:   Wed, 5 Jul 2017 14:59:49 +0000
From:   Chris Paterson <Chris.Paterson2@...esas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Biju Das <biju.das@...renesas.com>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH v 1/2] ravb: Add support for r8a7743 SoC

Hello Geert,

> From: geert.uytterhoeven@...il.com
> [mailto:geert.uytterhoeven@...il.com] On Behalf Of Geert Uytterhoeven
> Sent: 05 July 2017 15:56
> 
> Hi Chris,
> 
> On Wed, Jul 5, 2017 at 3:51 PM, Chris Paterson
> <Chris.Paterson2@...esas.com> wrote:
> >> From: geert.uytterhoeven@...il.com
> >> [mailto:geert.uytterhoeven@...il.com] On Behalf Of Geert
> Uytterhoeven
> >> Sent: 05 July 2017 14:47
> >> On Wed, Jul 5, 2017 at 3:01 PM, Biju Das <biju.das@...renesas.com>
> wrote:
> >> > Add support for Gigabit Ethernet E-MAC on r8a7743 (RZ/G1M) SoC.
> >> > Renesas RZ/G1M (R8A7743) SoC Ethernet AVB IP is identical to the
> >> > R-Car
> >> > Gen2 family.
> >> >
> >> > Signed-off-by: Biju Das <biju.das@...renesas.com>
> >> > Reviewed-by: Chris Paterson <chris.paterson2@...esas.com>
> >>
> >> Thanks for your patch!
> >>
> >> > --- a/drivers/net/ethernet/renesas/ravb_main.c
> >> > +++ b/drivers/net/ethernet/renesas/ravb_main.c
> >> > @@ -1869,6 +1869,7 @@ static int ravb_mdio_release(struct
> >> > ravb_private
> >> > *priv)  }
> >> >
> >> >  static const struct of_device_id ravb_match_table[] = {
> >> > +       { .compatible = "renesas,etheravb-r8a7743", .data = (void
> >> > + *)RCAR_GEN2 },
> >> >         { .compatible = "renesas,etheravb-r8a7790", .data = (void
> >> *)RCAR_GEN2 },
> >> >         { .compatible = "renesas,etheravb-r8a7794", .data = (void
> >> *)RCAR_GEN2 },
> >> >         { .compatible = "renesas,etheravb-rcar-gen2", .data = (void
> >> > *)RCAR_GEN2 },
> >>
> >> As Sergei already mentioned, a driver update is not needed due to the
> >> presence of family-specific compatible values.
> >> Please drop that part, and you can add my:
> >> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> >
> > Should the other compatible values (r8a7790, 94 etc) be removed then? Or
> are they needed for backwards compatibility?
> 
> The other compatible values in DT bindings and DTS files should be kept, to
> allow handling of SoC-specific quirks if/when they are ever detected.
> 
> The other compatible values in the driver should be kept for backwards-
> compatibility with old DTB files that lack the (newer) family-specific
> compatible values.

Thank you for the comprehensive answer.

Kind regards, Chris


> 
> 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