linux-kernel - Re: [PATCH RFC v2 02/11] dt-bindings: net: dwmac-meson: Document the "timing-adjustment" clock

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Date:   Mon, 11 May 2020 00:34:43 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Rob Herring <robh@...nel.org>, robh+dt@...nel.org,
        devicetree@...r.kernel.org
Cc:     andrew@...n.ch, f.fainelli@...il.com,
        linux-amlogic@...ts.infradead.org, jianxin.pan@...ogic.com,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RFC v2 02/11] dt-bindings: net: dwmac-meson: Document the
 "timing-adjustment" clock

Hello Rob,

On Fri, May 1, 2020 at 11:53 PM Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:
>
> Hi Rob,
>
> On Fri, May 1, 2020 at 11:09 PM Rob Herring <robh@...nel.org> wrote:
> >
> > On Wed, 29 Apr 2020 22:16:35 +0200, Martin Blumenstingl wrote:
> > > The PRG_ETHERNET registers can add an RX delay in RGMII mode. This
> > > requires an internal re-timing circuit whose input clock is called
> > > "timing adjustment clock". Document this clock input so the clock can be
> > > enabled as needed.
> > >
> > > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> > > ---
> > >  .../devicetree/bindings/net/amlogic,meson-dwmac.yaml   | 10 +++++++---
> > >  1 file changed, 7 insertions(+), 3 deletions(-)
> > >
> >
> > My bot found errors running 'make dt_binding_check' on your patch:
> >
> > /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.example.dt.yaml: ethernet@...10000: clocks: Additional items are not allowed ([4294967295] was unexpected)
> > /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.example.dt.yaml: ethernet@...10000: clocks: [[4294967295], [4294967295], [4294967295], [4294967295]] is too long
> > /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.example.dt.yaml: ethernet@...10000: clocks: Additional items are not allowed ([4294967295] was unexpected)
> > /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.example.dt.yaml: ethernet@...10000: clocks: [[4294967295], [4294967295], [4294967295], [4294967295]] is too long
> I am seeing this on my own build machine as well, but only for the .yaml example
> The .dts example does not emit this warning
I found out what's going on here:
- I built these patches against the net-next tree (including dt_binding_check)
- and against linux-next (also including dt_binding_check)

Your tree contains commit f22531438ff42c ("dt-bindings: net: dwmac:
increase 'maxItems' for 'clocks', 'clock-names' properties") [0].
The net-next tree doesn't have that commit but linux-next does.
So when I run dt_binding_check with this series applied on top of
linux-next all warnings/errors are gone.
However when I run dt_binding_check with this series applied on top of
net-next I get the same errors as you.
The reason is that the additional patch in your tree increases the
maximum number of clocks from three to five. With this patch the
Amlogic DWMAC glue needs (up to) four clock inputs.

I have to re-send this series anyways due to a bug in another patch.
Please let me know how to make your bot happy when when I re-send the patches.


Thank you!
Martin


[0] https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git/commit/?h=dt/next&id=f22531438ff42ce568f81e346428461c71dea9e2