netdev - Re: [PATCH RESEND net-next v2 1/8] dt-bindings: net: dwmac-sun8i: Clean up clock delay chain descriptions

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Message-ID: <20180513200529.GF12738@lunn.ch>
Date:   Sun, 13 May 2018 22:05:29 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Corentin Labbe <clabbe.montjoie@...il.com>,
        Icenowy Zheng <icenowy@...c.io>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH RESEND net-next v2 1/8] dt-bindings: net: dwmac-sun8i:
 Clean up clock delay chain descriptions

> > Hi Chen-Yu
> >
> > Are these delays the MAC applies? Not the PHY. It would be good to
> > make it clear here these are MAC imposed delays.
> 
> Yes these are applied on the MAC side. Being described in the device
> tree bindings for the MAC, I thought this was implied to be the case?
> Are there known exceptions?

There is frequent confusion with this. Most of the time, the PHY does
the delay, not the MAC, based on the phy-mode. So the MAC doing it is
an exception in itself.

Do you actually need these delays for the board you adding support
for? Does the PHY not support adding the needed delays? If you don't
need the delays, i would not even implement them.

    Andrew