linux-kernel - [PATCH 5/5] arm64: tegra: Limit max cpu frequency on P3450

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Message-Id: <20250816-tegra210-speedo-v1-5-a981360adc27@gmail.com>
Date: Sat, 16 Aug 2025 00:53:37 -0500
From: Aaron Kling via B4 Relay <devnull+webgeek1234.gmail.com@...nel.org>
To: Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>, Joseph Lo <josephl@...dia.com>, 
 Peter De Schrijver <pdeschrijver@...dia.com>, 
 Prashant Gaikwad <pgaikwad@...dia.com>
Cc: linux-clk@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thierry Reding <treding@...dia.com>, Aaron Kling <webgeek1234@...il.com>
Subject: [PATCH 5/5] arm64: tegra: Limit max cpu frequency on P3450

From: Aaron Kling <webgeek1234@...il.com>

P3450's cpu is only rated for 1.4 GHz while the CVB table it uses tries
to scale to 1.5 GHz. Set an appropriate limit on the maximum scaling
frequency.

Signed-off-by: Aaron Kling <webgeek1234@...il.com>
---
 arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts b/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts
index ec0e84cb83ef9bf8f0e52e2958db33666813917c..10f878d3f50815d1f0297d15669048ab9cad73ee 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts
@@ -594,6 +594,7 @@ clock@...10000 {
 		nvidia,droop-ctrl = <0x00000f00>;
 		nvidia,force-mode = <1>;
 		nvidia,sample-rate = <25000>;
+		nvidia,dfll-max-freq = <1479000000>;
 
 		nvidia,pwm-min-microvolts = <708000>;
 		nvidia,pwm-period-nanoseconds = <2500>; /* 2.5us */

-- 
2.50.1