linux-kernel - Re: [PATCH net-next v4 0/5] net/ravb: Add support for explicit internal clock delay configuration

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Date:   Wed, 30 Sep 2020 14:21:30 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Dan Murphy <dmurphy@...com>,
        Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Magnus Damm <magnus.damm@...il.com>,
        netdev <netdev@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v4 0/5] net/ravb: Add support for explicit
 internal clock delay configuration

Hi David, Jakub,

On Thu, Sep 17, 2020 at 3:57 PM Geert Uytterhoeven
<geert+renesas@...der.be> wrote:
> Some Renesas EtherAVB variants support internal clock delay
> configuration, which can add larger delays than the delays that are
> typically supported by the PHY (using an "rgmii-*id" PHY mode, and/or
> "[rt]xc-skew-ps" properties).
>
> Historically, the EtherAVB driver configured these delays based on the
> "rgmii-*id" PHY mode.  This caused issues with PHY drivers that
> implement PHY internal delays properly[1].  Hence a backwards-compatible
> workaround was added by masking the PHY mode[2].
>
> This patch series implements the next step of the plan outlined in [3],
> and adds proper support for explicit configuration of the MAC internal
> clock delays using new "[rt]x-internal-delay-ps" properties.  If none of
> these properties is present, the driver falls back to the old handling.
>
> This can be considered the MAC counterpart of commit 9150069bf5fc0e86
> ("dt-bindings: net: Add tx and rx internal delays"), which applies to
> the PHY.  Note that unlike commit 92252eec913b2dd5 ("net: phy: Add a
> helper to return the index for of the internal delay"), no helpers are
> provided to parse the DT properties, as so far there is a single user
> only, which supports only zero or a single fixed value.  Of course such
> helpers can be added later, when the need arises, or when deemed useful
> otherwise.
>
> This series consists of 3 parts:
>   1. DT binding updates documenting the new properties, for both the
>      generic ethernet-controller and the EtherAVB-specific bindings,
>   2. Conversion to json-schema of the Renesas EtherAVB DT bindings.
>      Technically, the conversion is independent of all of the above.
>      I included it in this series, as it shows how all sanity checks on
>      "[rt]x-internal-delay-ps" values are implemented as DT binding
>      checks,
>   3. EtherAVB driver update implementing support for the new properties.
>
> Given Rob has provided his acks for the DT binding updates, all of this
> can be merged through net-next.
>
> Changes compared to v3[4]:
>   - Add Reviewed-by,
>   - Drop the DT updates, as they will be merged through renesas-devel and
>     arm-soc, and have a hard dependency on this series.
>
> Changes compared to v2[5]:
>   - Update recently added board DTS files,
>   - Add Reviewed-by.
>
> Changes compared to v1[6]:
>   - Added "[PATCH 1/7] dt-bindings: net: ethernet-controller: Add
>     internal delay properties",
>   - Replace "renesas,[rt]xc-delay-ps" by "[rt]x-internal-delay-ps",
>   - Incorporated EtherAVB DT binding conversion to json-schema,
>   - Add Reviewed-by.
>
> Impacted, tested:
>   - Salvator-X(S) with R-Car H3 ES1.0 and ES2.0, M3-W, and M3-N.
>
> Not impacted, tested:
>   - Ebisu with R-Car E3.
>
> Impacted, not tested:
>   - Salvator-X(S) with other SoC variants,
>   - ULCB with R-Car H3/M3-W/M3-N variants,
>   - V3MSK and Eagle with R-Car V3M,
>   - Draak with R-Car V3H,
>   - HiHope RZ/G2[MN] with RZ/G2M or RZ/G2N,
>   - Beacon EmbeddedWorks RZ/G2M Development Kit.
>
> To ease testing, I have pushed this series and the DT updates to the
> topic/ravb-internal-clock-delays-v4 branch of my renesas-drivers
> repository at
> git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git.
>
> Thanks for applying!

Is there anything still blocking this series?

Thanks!

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