The Renesas RZ/N2H (R9A09G087) SoC includes a Temperature Sensor Unit
(TSU). The device provides real-time temperature measurements for
thermal management, utilizing a single dedicated channel for temperature
sensing.

The TSU loads calibration data via SMC SIP.

Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
---
V3:
 * no changes

V2:
 * no changes

 arch/arm64/boot/dts/renesas/r9a09g087.dtsi | 46 ++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r9a09g087.dtsi b/arch/arm64/boot/dts/renesas/r9a09g087.dtsi
index 64a7f94ab316..c742a67663cc 100644
--- a/arch/arm64/boot/dts/renesas/r9a09g087.dtsi
+++ b/arch/arm64/boot/dts/renesas/r9a09g087.dtsi
@@ -36,6 +36,7 @@ cpu0: cpu@0 {
 			next-level-cache = <&L3_CA55>;
 			enable-method = "psci";
 			clocks = <&cpg CPG_CORE R9A09G087_CLK_CA55C0>;
+			#cooling-cells = <2>;
 			operating-points-v2 = <&cluster0_opp>;
 		};
 
@@ -46,6 +47,7 @@ cpu1: cpu@100 {
 			next-level-cache = <&L3_CA55>;
 			enable-method = "psci";
 			clocks = <&cpg CPG_CORE R9A09G087_CLK_CA55C1>;
+			#cooling-cells = <2>;
 			operating-points-v2 = <&cluster0_opp>;
 		};
 
@@ -56,6 +58,7 @@ cpu2: cpu@200 {
 			next-level-cache = <&L3_CA55>;
 			enable-method = "psci";
 			clocks = <&cpg CPG_CORE R9A09G087_CLK_CA55C2>;
+			#cooling-cells = <2>;
 			operating-points-v2 = <&cluster0_opp>;
 		};
 
@@ -66,6 +69,7 @@ cpu3: cpu@300 {
 			next-level-cache = <&L3_CA55>;
 			enable-method = "psci";
 			clocks = <&cpg CPG_CORE R9A09G087_CLK_CA55C3>;
+			#cooling-cells = <2>;
 			operating-points-v2 = <&cluster0_opp>;
 		};
 
@@ -244,6 +248,17 @@ wdt5: watchdog@80083400 {
 			status = "disabled";
 		};
 
+		tsu: thermal@80086000 {
+			compatible = "renesas,r9a09g087-tsu", "renesas,r9a09g077-tsu";
+			reg = <0 0x80086000 0 0x1000>;
+			interrupts = <GIC_SPI 713 IRQ_TYPE_EDGE_RISING>,
+				     <GIC_SPI 714 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "adi", "adcmpi";
+			clocks = <&cpg CPG_MOD 307>;
+			power-domains = <&cpg>;
+			#thermal-sensor-cells = <0>;
+		};
+
 		i2c0: i2c@80088000 {
 			compatible = "renesas,riic-r9a09g087", "renesas,riic-r9a09g077";
 			reg = <0 0x80088000 0 0x400>;
@@ -955,6 +970,37 @@ sdhi1_vqmmc: vqmmc-regulator {
 		};
 	};
 
+	thermal-zones {
+		cpu-thermal {
+			polling-delay = <1000>;
+			polling-delay-passive = <250>;
+			thermal-sensors = <&tsu>;
+
+			cooling-maps {
+				map0 {
+					trip = <&target>;
+					cooling-device = <&cpu0 0 1>, <&cpu1 0 1>,
+							 <&cpu2 0 1>, <&cpu3 0 1>;
+					contribution = <1024>;
+				};
+			};
+
+			trips {
+				target: trip-point {
+					temperature = <95000>;
+					hysteresis = <1000>;
+					type = "passive";
+				};
+
+				sensor_crit: sensor-crit {
+					temperature = <120000>;
+					hysteresis = <1000>;
+					type = "critical";
+				};
+			};
+		};
+	};
+
 	stmmac_axi_setup: stmmac-axi-config {
 		snps,lpi_en;
 		snps,wr_osr_lmt = <0xf>;
-- 
2.52.0

On Wed, 26 Nov 2025 at 14:05, Cosmin Tanislav
<cosmin-gabriel.tanislav.xa@renesas.com> wrote:
> The Renesas RZ/N2H (R9A09G087) SoC includes a Temperature Sensor Unit
> (TSU). The device provides real-time temperature measurements for
> thermal management, utilizing a single dedicated channel for temperature
> sensing.
>
> The TSU loads calibration data via SMC SIP.
>
> Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
i.e. will queue in renesas-devel for v6.20.

> --- a/arch/arm64/boot/dts/renesas/r9a09g087.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r9a09g087.dtsi

> @@ -955,6 +970,37 @@ sdhi1_vqmmc: vqmmc-regulator {
>                 };
>         };
>
> +       thermal-zones {

I will move this after stmmac-axi-config while applying, to preserve
sort order (alphabetical).

[...]

> +       };
> +
>         stmmac_axi_setup: stmmac-axi-config {
>                 snps,lpi_en;
>                 snps,wr_osr_lmt = <0xf>;

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds