arm64: dts: broadcom: Assign clock rates in eth node for RPi5

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

Posted by Andrea della Porta 3 months, 2 weeks ago

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@suse.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

Re: [PATCH] arm64: dts: broadcom: Assign clock rates in eth node for RPi5

Posted by Florian Fainelli 3 months, 2 weeks ago

From: Florian Fainelli <f.fainelli@gmail.com>

On Tue, 21 Oct 2025 15:55:33 +0200, Andrea della Porta <andrea.porta@suse.com> wrote:
> 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@suse.com>
> ---

Applied to https://github.com/Broadcom/stblinux/commits/devicetree-arm64/next, thanks!
--
Florian