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Date:   Fri, 15 Feb 2019 16:01:08 +0100
From:   Michal Vokáč <>
To:     Vinod Koul <>, Andrew Lunn <>
Cc:     "David S. Miller" <>,,
        "" <>,
        Florian Fainelli <>
Subject: [RFC] net: dsa: qca8k: implement rgmii-id mode


networking on my boards [1], which are currently in linux-next, suddently
stopped working. I tracked it down to this commit 5ecdd77c61c8 ("net: dsa:
qca8k: disable delay for RGMII mode") [2].

So I think the rgmii-id mode is obviously needed in my case.
I was able to find a couple drivers that read tx/rx-delay or
tx/rx-internal-delay from device tree. Namely:


I would appreciate any hints how to add similar function to qca8k driver
if that is the correct way to go. Can I take some of the above mentioned
drivers as a good example for that? How should the binding look like?

I would expect something like this:

	switch@0 {
		compatible = "qca,qca8334";
		reg = <0>;

		switch_ports: ports {
			#address-cells = <1>;
			#size-cells = <0>;

			ethphy0: port@0 {
				reg = <0>;
				label = "cpu";
				phy-mode = "rgmii-id";
				qca,tx-delay = <3>;
				qca,rx-delay = <3>;
				ethernet = <&fec>;

Thanks in advance,


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