linux-kernel - [PATCH] ARM: dts: imx6dl-yapp4: Use rgmii-id phy mode on the cpu port

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Message-Id: <1550583420-112858-1-git-send-email-michal.vokac@ysoft.com>
Date:   Tue, 19 Feb 2019 14:37:00 +0100
From:   Michal Vokáč <michal.vokac@...ft.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Vinod Koul <vkoul@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Michal Vokáč <michal.vokac@...ft.com>
Subject: [PATCH] ARM: dts: imx6dl-yapp4: Use rgmii-id phy mode on the cpu port

The PHY must add delays to both Tx and Rx clock on the cpu port
to work propperly.

It worked with the rgmii mode before beacause the qca8k driver
(incorrecly) enabled delays in that mode.

Signed-off-by: Michal Vokáč <michal.vokac@...ft.com>
---
This imx6dl-yapp4 platform is currently waiting in linux-next.

Commit 5ecdd77c61c8 ("net: dsa: qca8k: disable delay for RGMII mode"), now
also in linux-next removed the delays from the RGMII mode so the networking
stopped working.

Recently Koul submitted a patch that implements the rgmii-id mode to fix
the issue [1].

As the networking is broken at this moment it does not matter which patch
goes in first. It is not neccessary to wait until the Koul's patch is
applied/merged if that should be the case.

[1] http://patchwork.ozlabs.org/patch/1044505/

 arch/arm/boot/dts/imx6dl-yapp4-common.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx6dl-yapp4-common.dtsi b/arch/arm/boot/dts/imx6dl-yapp4-common.dtsi
index b715ab0fa1ff..091d829f6b05 100644
--- a/arch/arm/boot/dts/imx6dl-yapp4-common.dtsi
+++ b/arch/arm/boot/dts/imx6dl-yapp4-common.dtsi
@@ -125,7 +125,7 @@
 				ethphy0: port@0 {
 					reg = <0>;
 					label = "cpu";
-					phy-mode = "rgmii";
+					phy-mode = "rgmii-id";
 					ethernet = <&fec>;

 					fixed-link {
-- 
2.1.4