linux-kernel - Re: [PATCH v3 5/7] ravb: Add support for explicit internal clock delay configuration

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Date:   Mon, 24 Aug 2020 10:58:37 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>
Cc:     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@...r.kernel.org,
        devicetree@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/7] ravb: Add support for explicit internal clock
 delay configuration

On 8/19/20 6:43 AM, Geert Uytterhoeven wrote:
> Some 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].
> 
> Add proper support for explicit configuration of the MAC internal clock
> delays using the new "[rt]x-internal-delay-ps" properties.
> Fall back to the old handling if none of these properties is present.
> 
> [1] Commit bcf3440c6dd78bfe ("net: phy: micrel: add phy-mode support for
>     the KSZ9031 PHY")
> [2] Commit 9b23203c32ee02cd ("ravb: Mask PHY mode to avoid inserting
>     delays twice").
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Reviewed-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian