netdev - Re: [PATCH net-next 1/3] dt-bindings: net: sh_eth: add R-Car Gen[12] fallback compatibility strings

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Message-ID: <CAMuHMdUbA6eAx7EBYi1+Yx2aoV5L0vR5XWXqgZT+NOP4t+d74A@mail.gmail.com>
Date:   Tue, 17 Oct 2017 10:22:49 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Simon Horman <horms+renesas@...ge.net.au>
Cc:     David Miller <davem@...emloft.net>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Magnus Damm <magnus.damm@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH net-next 1/3] dt-bindings: net: sh_eth: add R-Car Gen[12]
 fallback compatibility strings

On Tue, Oct 17, 2017 at 9:47 AM, Simon Horman
<horms+renesas@...ge.net.au> wrote:
> Add fallback compatibility strings for R-Car Gen 1 and 2.
>
> In the case of Renesas R-Car hardware we know that there are generations of
> SoCs, f.e. Gen 1 and 2. But beyond that its not clear what the relationship

it's

> between IP blocks might be. For example, I believe that r8a7790 is older
> than r8a7791 but that doesn't imply that the latter is a descendant of the
> former or vice versa.
>
> We can, however, by examining the documentation and behaviour of the
> hardware at run-time observe that the current driver implementation appears
> to be compatible with the IP blocks on SoCs within a given generation.
>
> For the above reasons and convenience when enabling new SoCs a
> per-generation fallback compatibility string scheme being adopted for

is being adopted?

> drivers for Renesas SoCs.
>
> Note that R-Car Gen2 and RZ/G1 have many compatible IP blocks.  The
> approach that has been consistently taken for other IP blocks is to name
> common code, compatibility strings and so on after Rcar Gen2.
>
> Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

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