netdev - [PATCH RFC] powerpc: switch two fixed phy links to full duplex

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Message-ID: <64533952-1299-4ae2-860d-b34b97a24d98@gmail.com>
Date: Fri, 5 Dec 2025 18:21:50 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Madhavan Srinivasan
 <maddy@...ux.ibm.com>, Michael Ellerman <mpe@...erman.id.au>,
 Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Pantelis Antoniou <pantelis.antoniou@...il.com>
Cc: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH RFC] powerpc: switch two fixed phy links to full duplex

These two fixed links are the only ones in-kernel specifying half duplex.
If these could be switched to full duplex, then half duplex handling
could be removed from phylib fixed phy, phylink, swphy.

The SoC MAC's are capable of full duplex, fs_enet MAC driver is as well.
Anything that would keep us from switching to full duplex?

Whilst at it, replace the deprecated old fixed-link binding.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 arch/powerpc/boot/dts/mgcoge.dts | 6 +++++-
 arch/powerpc/boot/dts/tqm8xx.dts | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/boot/dts/mgcoge.dts b/arch/powerpc/boot/dts/mgcoge.dts
index 9cefed20723..cea9bdc65dc 100644
--- a/arch/powerpc/boot/dts/mgcoge.dts
+++ b/arch/powerpc/boot/dts/mgcoge.dts
@@ -153,7 +153,11 @@ eth0: ethernet@...60 {
 				interrupt-parent = <&PIC>;
 				linux,network-index = <0>;
 				fsl,cpm-command = <0xce00000>;
-				fixed-link = <0 0 10 0 0>;
+
+				fixed-link {
+					speed = <10>;
+					full-duplex;
+				};
 			};
 
 			i2c@...60 {
diff --git a/arch/powerpc/boot/dts/tqm8xx.dts b/arch/powerpc/boot/dts/tqm8xx.dts
index d16cdfd8120..e582487d5a3 100644
--- a/arch/powerpc/boot/dts/tqm8xx.dts
+++ b/arch/powerpc/boot/dts/tqm8xx.dts
@@ -185,7 +185,11 @@ eth0: ethernet@a00 {
 				interrupt-parent = <&CPM_PIC>;
 				fsl,cpm-command = <0000>;
 				linux,network-index = <0>;
-				fixed-link = <0 0 10 0 0>;
+
+				fixed-link {
+					speed = <10>;
+					full-duplex;
+				};
 			};
 		};
 	};
-- 
2.52.0