linux-kernel - Re: [RFC PATCH net-next v5 16/25] net: dsa: qca8k: make rgmii delay configurable

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Date:   Fri, 14 May 2021 18:55:40 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH net-next v5 16/25] net: dsa: qca8k: make rgmii delay
 configurable

On Tue, May 11, 2021 at 04:04:51AM +0200, Ansuel Smith wrote:
> The legacy qsdk code used a different delay instead of the max value.
> Qsdk use 1 ms for rx and 2 ms for tx. Make these values configurable

More likely to be ns not ms.

> using the standard rx/tx-internal-delay-ps ethernet binding and apply
> qsdk values by default. The connected gmac doesn't add any delay so no
> additional delay is added to tx/rx.
> On this switch the delay is actually in ms so value should be in the
> 1000 order. Any value converted from ps to ms by deviding it by 1000
> as the switch max value for delay is 3ms.

dividing.

And more ms that should be ns. 

    Andrew