linux-kernel - [PATCH v2 3/4] arm64: dts: renesas: r9a08g045: Add TSU node

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Message-ID: <20250224173144.1952801-4-claudiu.beznea.uj@bp.renesas.com>
Date: Mon, 24 Feb 2025 19:31:43 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: rafael@...nel.org,
	daniel.lezcano@...aro.org,
	rui.zhang@...el.com,
	lukasz.luba@....com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	geert+renesas@...der.be,
	magnus.damm@...il.com,
	p.zabel@...gutronix.de
Cc: claudiu.beznea@...on.dev,
	linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH v2 3/4] arm64: dts: renesas: r9a08g045: Add TSU node

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Add TSU node along with thermal zones and keep it enabled in the SoC DTSI.
The temperature reported by the TSU can only be read through channel 8 of
the ADC. Therefore, enable the ADC by default.

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v2:
- collected Geert's tag
- adjusted the trip points temperature as suggested in the review
  process
- added cpu_alert1 passive trip point as suggested in the review
  process; along with it changed the trip point nodes and label names

Hi, Geert,

I kept your Rb tag. Please let me know if it should be dropped.

Thank you,
Claudiu

 arch/arm64/boot/dts/renesas/r9a08g045.dtsi    | 49 ++++++++++++++++++-
 .../boot/dts/renesas/rzg3s-smarc-som.dtsi     |  4 --
 2 files changed, 48 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/boot/dts/renesas/r9a08g045.dtsi b/arch/arm64/boot/dts/renesas/r9a08g045.dtsi
index 0364f89776e6..3f56fff7d9b0 100644
--- a/arch/arm64/boot/dts/renesas/r9a08g045.dtsi
+++ b/arch/arm64/boot/dts/renesas/r9a08g045.dtsi
@@ -233,7 +233,6 @@ adc: adc@...58000 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			#io-channel-cells = <1>;
-			status = "disabled";
 
 			channel@0 {
 				reg = <0>;
@@ -272,6 +271,17 @@ channel@8 {
 			};
 		};
 
+		tsu: thermal@...59000 {
+			compatible = "renesas,r9a08g045-tsu";
+			reg = <0 0x10059000 0 0x1000>;
+			clocks = <&cpg CPG_MOD R9A08G045_TSU_PCLK>;
+			resets = <&cpg R9A08G045_TSU_PRESETN>;
+			power-domains = <&cpg>;
+			#thermal-sensor-cells = <0>;
+			io-channels = <&adc 8>;
+			io-channel-names = "tsu";
+		};
+
 		vbattb: clock-controller@...5c000 {
 			compatible = "renesas,r9a08g045-vbattb";
 			reg = <0 0x1005c000 0 0x1000>;
@@ -717,6 +727,43 @@ timer {
 				  "hyp-virt";
 	};
 
+	thermal-zones {
+		cpu_thermal: cpu-thermal {
+			polling-delay-passive = <250>;
+			polling-delay = <1000>;
+			thermal-sensors = <&tsu>;
+			sustainable-power = <423>;
+
+			cooling-maps {
+				map0 {
+					trip = <&cpu_alert0>;
+					cooling-device = <&cpu0 0 2>;
+					contribution = <1024>;
+				};
+			};
+
+			trips {
+				cpu_crit: cpu-critical {
+					temperature = <110000>;
+					hysteresis = <1000>;
+					type = "critical";
+				};
+
+				cpu_alert1: trip-point1 {
+					temperature = <90000>;
+					hysteresis = <1000>;
+					type = "passive";
+				};
+
+				cpu_alert0: trip-point0 {
+					temperature = <85000>;
+					hysteresis = <1000>;
+					type = "passive";
+				};
+			};
+		};
+	};
+
 	vbattb_xtal: vbattb-xtal {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
diff --git a/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi b/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi
index 39845faec894..6f25ab617982 100644
--- a/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi
+++ b/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi
@@ -84,10 +84,6 @@ x3_clk: x3-clock {
 	};
 };
 
-&adc {
-	status = "okay";
-};
-
 #if SW_CONFIG3 == SW_ON
 &eth0 {
 	pinctrl-0 = <&eth0_pins>;
-- 
2.43.0