linux-kernel - [PATCH v2 1/2] arm64: dts: imx8mp: add idle cooling devices to cpu core

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Message-ID: <20251013065903.35216-1-martink@posteo.de>
Date: Mon, 13 Oct 2025 06:59:19 +0000
From: Martin Kepplinger-Novaković <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: devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Martin Kepplinger-Novaković <martink@...teo.de>
Subject: [PATCH v2 1/2] arm64: dts: imx8mp: add idle cooling devices to cpu core

The thermal framework can use the cpu-idle-states as
described for imx8mp as an alternative or in parallel to
cpufreq.

Add the DT node to the cpu so the cooling devices will be present
and the thermal zone descriptions can use them.

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

hi Shawn and all,

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

revision history:

v2: thanks Shawn
- add a newline between property and child node.

v1: https://lore.kernel.org/linux-arm-kernel/20250715055903.1806961-1-martink@posteo.de/

thanks,

                               martin


 arch/arm64/boot/dts/freescale/imx8mp.dtsi | 24 +++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
index a3de6604e29f..9b59f53952d5 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
@@ -80,6 +80,12 @@ A53_0: cpu@0 {
 			operating-points-v2 = <&a53_opp_table>;
 			#cooling-cells = <2>;
 			cpu-idle-states = <&cpu_pd_wait>;
+
+			cpu0_therm: thermal-idle {
+				#cooling-cells = <2>;
+				duration-us = <10000>;
+				exit-latency-us = <700>;
+			};
 		};
 
 		A53_1: cpu@1 {
@@ -98,6 +104,12 @@ A53_1: cpu@1 {
 			operating-points-v2 = <&a53_opp_table>;
 			#cooling-cells = <2>;
 			cpu-idle-states = <&cpu_pd_wait>;
+
+			cpu1_therm: thermal-idle {
+				#cooling-cells = <2>;
+				duration-us = <10000>;
+				exit-latency-us = <700>;
+			};
 		};
 
 		A53_2: cpu@2 {
@@ -116,6 +128,12 @@ A53_2: cpu@2 {
 			operating-points-v2 = <&a53_opp_table>;
 			#cooling-cells = <2>;
 			cpu-idle-states = <&cpu_pd_wait>;
+
+			cpu2_therm: thermal-idle {
+				#cooling-cells = <2>;
+				duration-us = <10000>;
+				exit-latency-us = <700>;
+			};
 		};
 
 		A53_3: cpu@3 {
@@ -134,6 +152,12 @@ A53_3: cpu@3 {
 			operating-points-v2 = <&a53_opp_table>;
 			#cooling-cells = <2>;
 			cpu-idle-states = <&cpu_pd_wait>;
+
+			cpu3_therm: thermal-idle {
+				#cooling-cells = <2>;
+				duration-us = <10000>;
+				exit-latency-us = <700>;
+			};
 		};
 
 		A53_L2: l2-cache0 {
-- 
2.47.3