Message-ID: <302496B2-46F1-456D-A9A0-8257B5582695@gmail.com>
Date:   Fri, 11 Aug 2017 08:03:29 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Corentin Labbe <clabbe.montjoie@...il.com>,
        Chen-Yu Tsai <wens@...e.org>, robh+dt@...nel.org,
        mark.rutland@....com
CC:     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 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?


>
>If you have any other solution...
>
>Regards
>
>>From fe39183946f7f4a6e21bce38fd8e4c1413012d68 Mon Sep 17 00:00:00 2001
>From: Corentin Labbe <clabbe.montjoie@...il.com>
>Date: Fri, 11 Aug 2017 14:49:54 +0200
>Subject: [PATCH] ARM: sun8i: sunxi-h3-h5: Prevent merge of external and
> integrated PHY
>
>Actually, some external and integrated PHY are merged due to same
>dtnode
>name "ethernet-phy@1".
>
>This is problematic when we will want to use the phy-is-integrated
>property. (Need to delete it on all external PHY node)
>
>An easy solution is to set integrated PHY nodeaddresss at a fake one
>that would never be used.
>Since board makers currently only provides PHY at addresses 1 and 7,
>we will use 31.
>
>Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
>---
> arch/arm/boot/dts/sunxi-h3-h5.dtsi | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
>diff --git a/arch/arm/boot/dts/sunxi-h3-h5.dtsi
>b/arch/arm/boot/dts/sunxi-h3-h5.dtsi
>index 54fc24e4c569..2110b0069e33 100644
>--- a/arch/arm/boot/dts/sunxi-h3-h5.dtsi
>+++ b/arch/arm/boot/dts/sunxi-h3-h5.dtsi
>@@ -420,7 +420,15 @@
> 			mdio: mdio {
> 				#address-cells = <1>;
> 				#size-cells = <0>;
>-				int_mii_phy: ethernet-phy@1 {
>+				/*
>+				 * Using 31 permits to make a separation between
>+				 * this integrated PHY and external ones.
>+				 * Without it, external "ethernet-phy@1" will be
>+				 * merged with it (due to same dtnode name).
>+				 * Board makers currently only provides PHY at
>+				 * addresses 1 and 7.
>+				 */
>+				int_mii_phy: ethernet-phy@31 {
> 					compatible = "ethernet-phy-ieee802.3-c22";
> 					reg = <1>;
> 					clocks = <&ccu CLK_BUS_EPHY>;


-- 
Florian

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