linux-kernel - Re: [PATCH RFC v2 3/5] net: stmmac: dwmac-meson8b: use picoseconds for the RGMII RX delay

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Date:   Tue, 17 Nov 2020 23:50:31 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, netdev@...r.kernel.org,
        jianxin.pan@...ogic.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, khilman@...libre.com,
        Neil Armstrong <narmstrong@...libre.com>, jbrunet@...libre.com,
        andrew@...n.ch
Subject: Re: [PATCH RFC v2 3/5] net: stmmac: dwmac-meson8b: use picoseconds
 for the RGMII RX delay

Hi Florian,

On Tue, Nov 17, 2020 at 7:36 PM Florian Fainelli <f.fainelli@...il.com> wrote:
>
> On 11/15/20 10:52 AM, Martin Blumenstingl wrote:
> > Amlogic Meson G12A, G12B and SM1 SoCs have a more advanced RGMII RX
> > delay register which allows picoseconds precision. Parse the new
> > "amlogic,rgmii-rx-delay-ps" property or fall back to the old
> > "amlogic,rx-delay-ns".
> >
> > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
>
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
first of all: thanks for reviewing this (and the rest of the series)!

> Maybe also issue a warning when the 'amlogic,rx-delay-ns' property is
> found in addition to the 'amlogic,rgmii-rx-delay-ps'? Up to you how to
> manage existing DTBs being deployed.
none of the upstream DTBs uses amlogic,rx-delay-ns - and I am also not
aware of anything being in use "downstream".
I will add a sentence to the commit description when I re-send this
without RFC, something along those lines: "No upstream DTB uses the
old amlogic,rx-delay-ns (yet). Only include minimalistic logic to fall
back to the old property, without any special validation (for example:
old and new property are given at the same time)"

What do you think?


Best regards,
Martin