linux-kernel - [PATCH] arm64: dts: broadcom: Assign clock rates in eth node for RPi5

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Message-ID: <20251021135533.5517-1-andrea.porta@suse.com>
Date: Tue, 21 Oct 2025 15:55:33 +0200
From: Andrea della Porta <andrea.porta@...e.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	devicetree@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Stanimir Varbanov <svarbanov@...e.de>,
	Andrew Lunn <andrew@...n.ch>,
	iivanov@...e.de,
	mbrugger@...e.com,
	Phil Elwell <phil@...pberrypi.com>
Cc: Andrea della Porta <andrea.porta@...e.com>
Subject: [PATCH] arm64: dts: broadcom: Assign clock rates in eth node for RPi5

In Raspberry Pi 5 DTS, the Ethernet clock rates must be assigned
as the default clock register values are not valid for the
Ethernet interface to function.
This can be done either in rp1_clocks node or in rp1_eth node.

Define the rates in rp1_eth node, as those clocks are 'leaf' clocks
used specifically by the Ethernet device only.

Fixes: 43456fdfc014 ("arm64: dts: broadcom: Enable RP1 ethernet for Raspberry Pi 5")
Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
---
 arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
index b8f256545022..09a849dd09b1 100644
--- a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
+++ b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
@@ -23,6 +23,10 @@ &pcie2 {
 };
 
 &rp1_eth {
+	assigned-clocks = <&rp1_clocks RP1_CLK_ETH_TSU>,
+			  <&rp1_clocks RP1_CLK_ETH>;
+	assigned-clock-rates = <50000000>,
+			       <125000000>;
 	status = "okay";
 	phy-mode = "rgmii-id";
 	phy-handle = <&phy1>;
-- 
2.35.3