[PATCH v2 19/19] ARM64: dts: r8a77965: Add EtherAVB device node

Hello!

On 02/22/2018 06:54 PM, Simon Horman wrote:

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+			clocks = <&cpg CPG_MOD 812>;
+			power-domains = <&sysc 32>;
+			resets = <&cpg 812>;
+			phy-mode = "rgmii-txid";

   Why not just "rgmii"? TX delay is a board specific detail, no?

I admit I took this one straight from r8a7796 dtsi.
Would you like to me resend and change this?

   Yes, unless Simon would fix it while merging...

Can I confirm the desired change is s/rgmii-txid/rgmii/ ?

   Yes.

   Apparently that means that this prop should be overridden in the board file
(which may not be an easy task given the board is Salvator-XS again).

[...]

Can we override it in r8a77965-salvator-x.dts or r8a77965-salvator-xs.dts?

   In salvator-common.dtsi most probably -- it has the PHY data for Ether AVB.

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I feel that I'm missing an important point here.

   Well, r8a779{5|6}.dtsi also have phy-mode = "rgmii-txid" (which was
   unjustified in my current understanding). Thus such board override
   wouldn't hurt them. But we lack a patch modifying salvator-common.dtsi
   in htis series, so I'm now thinking a respin of this series is needed
   anyway... sorry for being unclear. :-)

While I've applied other patches in this series I have
not applied this one - mainly to allow this discussion to conclude.

Is an appropriate solution to do the following?

1) Atomically update
   a) r8a779{5|6}.dtsi to use "rgmii" and
   b) salvator-common.dtsi to use "rgmii-txid"
2) Update this patch to use "rgmii"

   Yeah, I was thinking about doing exactly this...

Sorry if I'm still missing the point.

   I was referring to what the 2nd paragraph of [1] said about the internal delays
(perhaps I just misunderstood it)...

[1] https://en.wikipedia.org/wiki/Media-independent_interface#Reduced_gigabit_media-independent_interface

MBR, Sergei