linux-kernel - Re: [PATCH 2/3] ARM: sun8i: sunxi-h3-h5: add phy-is-integrated property to internal PHY

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Message-ID: <20170816091254.GB5732@Red>
Date:   Wed, 16 Aug 2017 11:12:54 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, robh+dt@...nel.org,
        mark.rutland@....com, Russell King <linux@...linux.org.uk>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        alexandre.torgue@...com, netdev <netdev@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        andrew@...n.ch
Subject: Re: [PATCH 2/3] ARM: sun8i: sunxi-h3-h5: add phy-is-integrated
 property to internal PHY

On Fri, Aug 11, 2017 at 08:03:29AM -0700, Florian Fainelli wrote:
> On August 11, 2017 6:25:26 AM PDT, Corentin Labbe <clabbe.montjoie@...il.com> wrote:
> >On Fri, Aug 11, 2017 at 04:22:11PM +0800, Chen-Yu Tsai wrote:
> >> On Fri, Aug 11, 2017 at 4:19 PM, Corentin Labbe
> >> <clabbe.montjoie@...il.com> wrote:
> >> > On Fri, Aug 11, 2017 at 04:11:13PM +0800, Chen-Yu Tsai wrote:
> >> >> On Fri, Aug 11, 2017 at 4:05 PM, Corentin Labbe
> >> >> <clabbe.montjoie@...il.com> wrote:
> >> >> > On Fri, Aug 11, 2017 at 10:42:51AM +0800, Chen-Yu Tsai wrote:
> >> >> >> Hi,
> >> >> >>
> >> >> >> On Thu, Aug 10, 2017 at 4:51 PM, Corentin Labbe
> >> >> >> <clabbe.montjoie@...il.com> wrote:
> >> >> >> > This patch add the new phy-is-integrated property to the
> >internal PHY
> >> >> >> > node.
> >> >> >> >
> >> >> >> > Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> >> >> >> > ---
> >> >> >> >  arch/arm/boot/dts/sunxi-h3-h5.dtsi | 1 +
> >> >> >> >  1 file changed, 1 insertion(+)
> >> >> >> >
> >> >> >> > diff --git a/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> >b/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> >> >> >> > index 4b599b5d26f6..54fc24e4c569 100644
> >> >> >> > --- a/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> >> >> >> > +++ b/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> >> >> >> > @@ -425,6 +425,7 @@
> >> >> >> >                                         reg = <1>;
> >> >> >> >                                         clocks = <&ccu
> >CLK_BUS_EPHY>;
> >> >> >> >                                         resets = <&ccu
> >RST_BUS_EPHY>;
> >> >> >> > +                                       phy-is-integrated;
> >> >> >>
> >> >> >> You also need to "delete" this property at the board level for
> >> >> >> any board that has the external PHY at address <1>. Otherwise
> >> >> >> they will stop working. This is due to the internal and
> >external
> >> >> >> PHYs having the same path and node name in the device tree, so
> >> >> >> they are effectively the same node.
> >> >> >>
> >> >> >> ChenYu
> >> >> >>
> >> >> >
> >> >> > They have not the same name, ext_rgmii_phy vs int_mii_phy.
> >> >>
> >> >> That is just the label. The label plays no part in device tree
> >merging. The path
> >> >>
> >> >>     /soc/ethernet@...0000/mdio/ethernet-phy@1
> >> >>
> >> >> is the same. You can look under
> >> >>
> >> >>     /proc/device-tree/soc/ethernet@...0000/mdio
> >> >>
> >> >> on the OrangePI Plus 2E or any other H3 board that uses an
> >> >> external PHY at address 1.
> >> >>
> >> >> ChenYu
> >> >
> >> > Since we get the phy node by phy-handle and not by path, I think
> >all should be good.
> >> 
> >> You are not getting me. The fact that the two seemingly separate
> >> nodes are merged together means, whatever properties you put in
> >> the internal PHY node, also affect the external PHY node. Once
> >> compiled, they are the SAME node.
> >
> >Hello Rob, florian, mark
> >
> >Adding a delete property on all external ethernet-phy@1 is a bit
> >overkill, and I dont like the idea that nodes are merged.
> 
> This is not exactly up to you that's just how DTC works.
> 
> >What do you think about other possible solutions:
> >- Using integrated-phy@1 for the integrated PHY node name
> 
> That might be okay although you are using now a seemingly non-standard unit name.
> 
> >- Using a fake address like 31 (see patch below)
> 
> You could also drop the address part in the unit name although we'd probably get a DTC warning for that.
> 
> I suspect both of your solutions and what I mentioned above will be producing DTC warnings to some extent... Rob what do you think?
> 

I think I found an easier solution, putting phy-is-integrated on board DT nodes only.
I will send an updated serie.

Regards