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Date:   Tue, 5 Jan 2021 14:06:15 +0100
From:   Geert Uytterhoeven <>
To:     Wolfram Sang <>
Cc:     Linux-Renesas <>,
        Sergei Shtylyov <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        Rob Herring <>,
        netdev <>,
        Linux Kernel Mailing List <>
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
<> 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 <>

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 <>

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

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.



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

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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