linux-kernel - [PATCH 2/2] arm64: dts: imx8mp: add cpuidle cooling device to the alert trip point

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Message-Id: <20250715055903.1806961-2-martink@posteo.de>
Date: Tue, 15 Jul 2025 05:59:23 +0000
From: Martin Kepplinger <martink@...teo.de>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	festevam@...il.com
Cc: kernel@...gutronix.de,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Martin Kepplinger <martink@...teo.de>
Subject: [PATCH 2/2] arm64: dts: imx8mp: add cpuidle cooling device to the alert trip point

Idle-inject up to 50% of all cpu's time in order to help cpufreq
to keep the temperature below the trip points.

Signed-off-by: Martin Kepplinger <martink@...teo.de>
---

hi Shawn and all,

50% is of course random, but this is an emergency situation already
so it might not be the most critical value to find a consensus for.

SoCs rarely describe and enable the idle-inject mechanism. IMO it is
desired if only in order to have an example of it merged.

thanks,

                               martin



 arch/arm64/boot/dts/freescale/imx8mp.dtsi | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
index 66e1a27d6eed9..6c1d7ca2de21d 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
@@ -343,7 +343,11 @@ map0 {
 						<&A53_3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
 						<&gpu3d THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
 						<&gpu2d THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
-						<&npu THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+						<&npu THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+						<&cpu0_therm 0 50>,
+						<&cpu1_therm 0 50>,
+						<&cpu2_therm 0 50>,
+						<&cpu3_therm 0 50>;
 				};
 			};
 		};
@@ -376,7 +380,11 @@ map0 {
 						<&A53_3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
 						<&gpu3d THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
 						<&gpu2d THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
-						<&npu THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+						<&npu THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+						<&cpu0_therm 0 50>,
+						<&cpu1_therm 0 50>,
+						<&cpu2_therm 0 50>,
+						<&cpu3_therm 0 50>;
 				};
 			};
 		};
-- 
2.39.5