linux-kernel - Re: [PATCH 2/2] arm64: dts: allwinner: Olimex A64-OLinuXino: fix ethernet

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Date:   Fri, 21 Sep 2018 12:25:53 -0300
From:   Rodrigo Exterckötter Tjäder 
        <rodrigo@...der.xyz>
To:     maxime.ripard@...tlin.com
Cc:     wens@...e.org, robh+dt@...nel.org, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: allwinner: Olimex A64-OLinuXino: fix ethernet

On Fri, Sep 21, 2018 at 11:30 AM Maxime Ripard
<maxime.ripard@...tlin.com> wrote:
> On Wed, Sep 19, 2018 at 11:19:36AM -0300, Rodrigo Exterckötter Tjäder wrote:
> > Without "allwinner,tx-delay-ps = <600>;" on the DTP it can receive packets
> > but not send.
> >
> > Signed-off-by: Rodrigo Exterckötter Tjäder <rodrigo@...der.xyz>
>
> Again, that commit log would be nice if it was a bit more
> explicit. What is a DTP? How did you come up with that value? What is
> the value used by Allwinner/Olimex, and why did you use another one if
> you did?

Thanks for the feedback.

DTP is a typo, it should have been DT for "device tree".

Olimex's provided device tree uses a different driver for ethernet,
but it has a property named "tx-delay" with value 6 and the range of
the property is 0-7. On dwmac-sun8i's bindings documentation it says
allwinner,tx-delay-ps has a range of 0-700 and must be a multiple of
100, so I tried 600 and it works.

I'm not sure how much of that I should include in the commit log,
perhaps something like this:

---
arm64: dts: allwinner: OLinuXino: PHY TX clock delay

The PHY requres a delay on the TX clock, otherwise it is not able to send
any packets on the interface.

Olimex's device tree uses 6 in a range of 0-7, dwmac-sun8i requires a
multiple of 100 in the range 0-700.

Signed-off-by: Rodrigo Exterckötter Tjäder <rodrigo@...der.xyz>