[PATCH v3 1/5] arm64: dts: rockchip: enable built-in thermal monitoring on RK3588

[Alexey Charkov]

Include thermal zones information in device tree for RK3588 variants.

This also enables the TSADC controller unconditionally on all boards
to ensure that thermal protections are in place via throttling and
emergency reset, once OPPs are added to enable CPU DVFS.

The default settings (using CRU as the emergency reset mechanism)
should work on all boards regardless of their wiring, as CRU resets
do not depend on any external components. Boards that have the TSHUT
signal wired to the reset line of the PMIC may opt to switch to GPIO
tshut mode instead (rockchip,hw-tshut-mode = <1>;)

It seems though that downstream kernels don't use that, even for
those boards where the wiring allows for GPIO based tshut, such as
Radxa Rock 5B [1], [2], [3]

[1] https://github.com/radxa/kernel/blob/stable-5.10-rock5/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts#L540
[2] https://github.com/radxa/kernel/blob/stable-5.10-rock5/arch/arm64/boot/dts/rockchip/rk3588s.dtsi#L5433
[3] https://dl.radxa.com/rock5/5b/docs/hw/radxa_rock_5b_v1423_sch.pdf page 11 (TSADC_SHUT_H)

Signed-off-by: Alexey Charkov <alchark at gmail.com>
---
 arch/arm64/boot/dts/rockchip/rk3588s.dtsi | 176 +++++++++++++++++++++++++++++-
 1 file changed, 175 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s.dtsi b/arch/arm64/boot/dts/rockchip/rk3588s.dtsi
index 36b1b7acfe6a..9bf197358642 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588s.dtsi
@@ -10,6 +10,7 @@
 #include <dt-bindings/reset/rockchip,rk3588-cru.h>
 #include <dt-bindings/phy/phy.h>
 #include <dt-bindings/ata/ahci.h>
+#include <dt-bindings/thermal/thermal.h>
 
 / {
 	compatible = "rockchip,rk3588";
@@ -2225,7 +2226,180 @@ tsadc: tsadc at fec00000 {
 		pinctrl-1 = <&tsadc_shut>;
 		pinctrl-names = "gpio", "otpout";
 		#thermal-sensor-cells = <1>;
-		status = "disabled";
+		status = "okay";
+	};
+
+	thermal_zones: thermal-zones {
+		/* sensor near the center of the SoC */
+		package_thermal: package-thermal {
+			polling-delay-passive = <0>;
+			polling-delay = <0>;
+			thermal-sensors = <&tsadc 0>;
+
+			trips {
+				package_crit: package-crit {
+					temperature = <115000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+		};
+
+		/* sensor between A76 cores 0 and 1 */
+		bigcore0_thermal: bigcore0-thermal {
+			polling-delay-passive = <100>;
+			polling-delay = <0>;
+			thermal-sensors = <&tsadc 1>;
+
+			trips {
+				/* threshold to start collecting temperature
+				 * statistics e.g. with the IPA governor
+				 */
+				bigcore0_alert0: bigcore0-alert0 {
+					temperature = <75000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+				/* actual control temperature */
+				bigcore0_alert1: bigcore0-alert1 {
+					temperature = <85000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+				bigcore0_crit: bigcore0-crit {
+					temperature = <115000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+			cooling-maps {
+				map0 {
+					trip = <&bigcore0_alert1>;
+					cooling-device =
+						<&cpu_b0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+						<&cpu_b1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+		};
+
+		/* sensor between A76 cores 2 and 3 */
+		bigcore2_thermal: bigcore2-thermal {
+			polling-delay-passive = <100>;
+			polling-delay = <0>;
+			thermal-sensors = <&tsadc 2>;
+
+			trips {
+				/* threshold to start collecting temperature
+				 * statistics e.g. with the IPA governor
+				 */
+				bigcore2_alert0: bigcore2-alert0 {
+					temperature = <75000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+				/* actual control temperature */
+				bigcore2_alert1: bigcore2-alert1 {
+					temperature = <85000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+				bigcore2_crit: bigcore2-crit {
+					temperature = <115000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+			cooling-maps {
+				map0 {
+					trip = <&bigcore2_alert1>;
+					cooling-device =
+						<&cpu_b2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+						<&cpu_b3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+		};
+
+		/* sensor between the four A55 cores */
+		little_core_thermal: littlecore-thermal {
+			polling-delay-passive = <100>;
+			polling-delay = <0>;
+			thermal-sensors = <&tsadc 3>;
+
+			trips {
+				/* threshold to start collecting temperature
+				 * statistics e.g. with the IPA governor
+				 */
+				littlecore_alert0: littlecore-alert0 {
+					temperature = <75000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+				/* actual control temperature */
+				littlecore_alert1: littlecore-alert1 {
+					temperature = <85000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+				littlecore_crit: littlecore-crit {
+					temperature = <115000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+			cooling-maps {
+				map0 {
+					trip = <&littlecore_alert1>;
+					cooling-device =
+						<&cpu_l0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+						<&cpu_l1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+						<&cpu_l2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+						<&cpu_l3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+		};
+
+		/* sensor near the PD_CENTER power domain */
+		center_thermal: center-thermal {
+			polling-delay-passive = <0>;
+			polling-delay = <0>;
+			thermal-sensors = <&tsadc 4>;
+
+			trips {
+				center_crit: center-crit {
+					temperature = <115000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+		};
+
+		gpu_thermal: gpu-thermal {
+			polling-delay-passive = <0>;
+			polling-delay = <0>;
+			thermal-sensors = <&tsadc 5>;
+
+			trips {
+				gpu_crit: gpu-crit {
+					temperature = <115000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+		};
+
+		npu_thermal: npu-thermal {
+			polling-delay-passive = <0>;
+			polling-delay = <0>;
+			thermal-sensors = <&tsadc 6>;
+
+			trips {
+				npu_crit: npu-crit {
+					temperature = <115000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+		};
 	};
 
 	saradc: adc at fec10000 {

-- 
2.44.0