netdev - Re: [PATCH 1/5] dt-bindings: net: renesas,etheravb: Add r8a779a0 support

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Date:   Tue, 5 Jan 2021 14:06:15 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        netdev <netdev@...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>
Subject: Re: [PATCH 1/5] dt-bindings: net: renesas,etheravb: Add r8a779a0 support

Hi Wolfram,

On Sun, Dec 27, 2020 at 2:06 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> Document the compatible value for the RAVB block in the Renesas R-Car
> V3U (R8A779A0) SoC. This variant has no stream buffer, so we only need
> to add the new compatible.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Thanks for your patch!

> --- a/Documentation/devicetree/bindings/net/renesas,etheravb.yaml
> +++ b/Documentation/devicetree/bindings/net/renesas,etheravb.yaml
> @@ -40,6 +40,7 @@ properties:
>                - renesas,etheravb-r8a77980     # R-Car V3H
>                - renesas,etheravb-r8a77990     # R-Car E3
>                - renesas,etheravb-r8a77995     # R-Car D3
> +              - renesas,etheravb-r8a779a0     # R-Car V3U
>            - const: renesas,etheravb-rcar-gen3 # R-Car Gen3 and RZ/G2
>
>    reg: true

EtherAVB on R-Car V3U does have the Tx clock internal Delay Mode
bit in the APSR register, so its compatible value should be added to
the list of SoCs where tx-internal-delay-ps is required.

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

The various Counter Registers starting at offset 0x700 are limited to
16-bit values, like on R-Car Gen2, while they support 32-bit values on
other R-Car Gen3 variants. The driver uses only the Transmit Retry Over
Counter Register (TROCR), for statistics, so we can just ignore that
difference.

V3U also has a new block of registers related to UDP/IP support (offset
0x800 and up).  I guess we can just ignore them too, for now.

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