linux-kernel - Re: [PATCH] arm64: dts: clearfog-gt-8k: fix ge phy reset pin

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Date:   Sun, 29 Mar 2020 11:42:35 +0300
From:   Rabeeh Khoury <rabeeh@...id-run.com>
To:     Baruch Siach <baruch@...s.co.il>
Cc:     Stefan Eichenberger <eichest@...il.com>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH] arm64: dts: clearfog-gt-8k: fix ge phy reset pin

On Sun, Mar 29, 2020 at 9:22 AM Baruch Siach <baruch@...s.co.il> wrote:
>
> Hi Stefan,
>
> On Sun, Mar 29 2020, eichest@...il.com wrote:
> > From: Stefan Eichenberger <eichest@...il.com>
> >
> > According to the ClearFog-GT-8K-rev-1_1-Simplified-Schematic the reset
> > pin for the gigabit phy is MPP62 and not MPP43.
>
> Have you tested that on real hardware?
>
> The 1Gb PHY reset on my Clearfog GT-8K is connected to MPP43. Russell's
> commit 46f94c7818e7 ("arm64: dts: clearfog-gt-8k: set gigabit PHY reset
> deassert delay") indicates that this is the case on his board as well.
>
> In case there was a hardware change between board revisions, we need
> another dtb for that revision.

It's a bug in the simplified schematics since that schematics is based
on rev 1.0 and not rev 1.1 as claimed.

In rev 1.0; the 1Gbps phy reset was connected to MPP62; but that MPP
is not functional as a GPIO when selecting MPP[56:61] as SD card.
Due to that we manually rewired ALL rev 1.0 PCBs 1Gbps phy to be
connected to MPP43 via R8038 pads.

Rev 1.1 fixes this by that by disconnecting 1Gbps phy reset from MPP62
and wiring it to MPP43.
So basically rev 1.0 and rev 1.1 are compatible software wise. We will
fix the schematics.

Rabeeh