linux-kernel - [PATCH net v2 2/3] arm64: dts: ls1043a-rdb: correct RGMII delay mode to rgmii-id

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Message-Id: <1584360358-8092-3-git-send-email-madalin.bucur@oss.nxp.com>
Date:   Mon, 16 Mar 2020 14:05:57 +0200
From:   Madalin Bucur <madalin.bucur@....nxp.com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     devicetree@...r.kernel.org, shawnguo@...nel.org,
        leoyang.li@....com, robh+dt@...nel.org, mark.rutland@....com,
        linux-kernel@...r.kernel.org,
        Madalin Bucur <madalin.bucur@....nxp.com>
Subject: [PATCH net v2 2/3] arm64: dts: ls1043a-rdb: correct RGMII delay mode to rgmii-id

The correct setting for the RGMII ports on LS1043ARDB is to
enable delay on both Rx and Tx so the interface mode used must
be PHY_INTERFACE_MODE_RGMII_ID.

Since commit 1b3047b5208a80 ("net: phy: realtek: add support for
configuring the RX delay on RTL8211F") the Realtek 8211F PHY driver
has control over the RGMII RX delay and it is disabling it for
RGMII_TXID. The LS1043ARDB uses two such PHYs in RGMII_ID mode but
in the device tree the mode was described as "rgmii_txid".
This issue was not apparent at the time as the PHY driver took the
same action for RGMII_TXID and RGMII_ID back then but it became
visible (RX no longer working) after the above patch.

Changing the phy-connection-type to "rgmii-id" to address the issue.

Fixes: bf02f2ffe59c ("arm64: dts: add LS1043A DPAA FMan support")
Signed-off-by: Madalin Bucur <madalin.bucur@....nxp.com>
---
 arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dts b/arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dts
index 4223a2352d45..dde50c88f5e3 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dts
+++ b/arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dts
@@ -119,12 +119,12 @@

 	ethernet@...00 {
 		phy-handle = <&rgmii_phy1>;
-		phy-connection-type = "rgmii-txid";
+		phy-connection-type = "rgmii-id";
 	};

 	ethernet@...00 {
 		phy-handle = <&rgmii_phy2>;
-		phy-connection-type = "rgmii-txid";
+		phy-connection-type = "rgmii-id";
 	};

 	ethernet@...00 {
-- 
2.1.0