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

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Message-Id: <20250715055903.1806961-1-martink@posteo.de>
Date: Tue, 15 Jul 2025 05:59:22 +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 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 <martink@...teo.de>
---
 arch/arm64/boot/dts/freescale/imx8mp.dtsi | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
index bb24dba7338ea..66e1a27d6eed9 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
@@ -80,6 +80,11 @@ 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 +103,11 @@ 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 +126,11 @@ 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 +149,11 @@ 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 {
-- 
2.39.5