[PATCH v1 04/13] ARM: tegra: cardhu: Support CPU thermal throttling

Dmitry Osipenko
2021-01-21T18:47:25Z

Enable CPU thermal throttling on Tegra30 Cardhu board.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
arch/arm/boot/dts/tegra30-cardhu.dtsi | 43 ++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/tegra30-cardhu.dtsi b/arch/arm/boot/dts/tegra30-cardhu.dtsi
index 309538bdcd66..2dff14b87f3e 100644
--- a/arch/arm/boot/dts/tegra30-cardhu.dtsi
+++ b/arch/arm/boot/dts/tegra30-cardhu.dtsi
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <dt-bindings/input/input.h>
+#include <dt-bindings/thermal/thermal.h>
#include "tegra30.dtsi"
#include "tegra30-cpu-opp.dtsi"
#include "tegra30-cpu-opp-microvolt.dtsi"
@@ -342,12 +343,13 @@ ldo8_reg: ldo8 {
};
};

- temperature-sensor@4c {
+ nct1008: temperature-sensor@4c {
compatible = "onnn,nct1008";
reg = <0x4c>;
vcc-supply = <&sys_3v3_reg>;
interrupt-parent = <&gpio>;
interrupts = <TEGRA_GPIO(CC, 2) IRQ_TYPE_LEVEL_LOW>;
+ #thermal-sensor-cells = <1>;
};

vdd_core: tps62361@60 {
@@ -441,21 +443,25 @@ cpus {
cpu0: cpu@0 {
cpu-supply = <&vddctrl_reg>;
operating-points-v2 = <&cpu0_opp_table>;
+ #cooling-cells = <2>;
};

cpu1: cpu@1 {
cpu-supply = <&vddctrl_reg>;
operating-points-v2 = <&cpu0_opp_table>;
+ #cooling-cells = <2>;
};

cpu2: cpu@2 {
cpu-supply = <&vddctrl_reg>;
operating-points-v2 = <&cpu0_opp_table>;
+ #cooling-cells = <2>;
};

cpu3: cpu@3 {
cpu-supply = <&vddctrl_reg>;
operating-points-v2 = <&cpu0_opp_table>;
+ #cooling-cells = <2>;
};
};

@@ -638,6 +644,41 @@ sound {
<&tegra_car TEGRA30_CLK_EXTERN1>;
};

+ thermal-zones {
+ cpu-thermal {
+ polling-delay-passive = <1000>; /* milliseconds */
+ polling-delay = <5000>; /* milliseconds */
+
+ thermal-sensors = <&nct1008 1>;
+
+ trips {
+ trip0: cpu-alert0 {
+ /* throttle at 57C until temperature drops to 56.8C */
+ temperature = <57000>;
+ hysteresis = <200>;
+ type = "passive";
+ };
+
+ trip1: cpu-crit {
+ /* shut down at 60C */
+ temperature = <60000>;
+ hysteresis = <2000>;
+ type = "critical";
+ };
+ };
+
+ cooling-maps {
+ map0 {
+ trip = <&trip0>;
+ cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+ <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+ <&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+ <&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+ };
+ };
+ };
+ };
+
gpio-keys {
compatible = "gpio-keys";

--
2.29.2