[PATCH v2 01/15] ARM: tegra: Add SoC thermal sensor to Tegra30 device-trees

Dmitry Osipenko
2021-08-02T21:20:41Z

Add the on-chip SoC thermal sensor to Tegra30 device-trees. Now CPU
temperature reporting and thermal throttling is available on all Tegra30
devices universally.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
arch/arm/boot/dts/tegra30.dtsi | 87 ++++++++++++++++++++++++++++++++--
1 file changed, 83 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/tegra30.dtsi b/arch/arm/boot/dts/tegra30.dtsi
index c577c191be4b..eaf4951d9ff8 100644
--- a/arch/arm/boot/dts/tegra30.dtsi
+++ b/arch/arm/boot/dts/tegra30.dtsi
@@ -5,6 +5,7 @@
#include <dt-bindings/pinctrl/pinctrl-tegra.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/soc/tegra-pmc.h>
+#include <dt-bindings/thermal/thermal.h>

#include "tegra30-peripherals-opp.dtsi"

@@ -800,6 +801,20 @@ fuse@7000f800 {
reset-names = "fuse";
};

+ tsensor: tsensor@70014000 {
+ compatible = "nvidia,tegra30-tsensor";
+ reg = <0x70014000 0x500>;
+ interrupts = <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&tegra_car TEGRA30_CLK_TSENSOR>;
+ resets = <&tegra_car TEGRA30_CLK_TSENSOR>;
+
+ assigned-clocks = <&tegra_car TEGRA30_CLK_TSENSOR>;
+ assigned-clock-parents = <&tegra_car TEGRA30_CLK_CLK_M>;
+ assigned-clock-rates = <500000>;
+
+ #thermal-sensor-cells = <1>;
+ };
+
hda@70030000 {
compatible = "nvidia,tegra30-hda";
reg = <0x70030000 0x10000>;
@@ -1062,32 +1077,36 @@ cpus {
#address-cells = <1>;
#size-cells = <0>;

- cpu@0 {
+ cpu0: cpu@0 {
device_type = "cpu";
compatible = "arm,cortex-a9";
reg = <0>;
clocks = <&tegra_car TEGRA30_CLK_CCLK_G>;
+ #cooling-cells = <2>;
};

- cpu@1 {
+ cpu1: cpu@1 {
device_type = "cpu";
compatible = "arm,cortex-a9";
reg = <1>;
clocks = <&tegra_car TEGRA30_CLK_CCLK_G>;
+ #cooling-cells = <2>;
};

- cpu@2 {
+ cpu2: cpu@2 {
device_type = "cpu";
compatible = "arm,cortex-a9";
reg = <2>;
clocks = <&tegra_car TEGRA30_CLK_CCLK_G>;
+ #cooling-cells = <2>;
};

- cpu@3 {
+ cpu3: cpu@3 {
device_type = "cpu";
compatible = "arm,cortex-a9";
reg = <3>;
clocks = <&tegra_car TEGRA30_CLK_CCLK_G>;
+ #cooling-cells = <2>;
};
};

@@ -1102,4 +1121,64 @@ pmu {
<&{/cpus/cpu@2}>,
<&{/cpus/cpu@3}>;
};
+
+ thermal-zones {
+ tsensor0-thermal {
+ polling-delay-passive = <1000>; /* milliseconds */
+ polling-delay = <5000>; /* milliseconds */
+
+ thermal-sensors = <&tsensor 0>;
+
+ trips {
+ level1_trip: dvfs-alert {
+ /* throttle at 80C until temperature drops to 79.8C */
+ temperature = <80000>;
+ hysteresis = <200>;
+ type = "passive";
+ };
+
+ level2_trip: cpu-div2-throttle {
+ /* hardware CPU x2 freq throttle at 85C */
+ temperature = <85000>;
+ hysteresis = <200>;
+ type = "hot";
+ };
+
+ level3_trip: soc-critical {
+ /* hardware shut down at 90C */
+ temperature = <90000>;
+ hysteresis = <2000>;
+ type = "critical";
+ };
+ };
+
+ cooling-maps {
+ map0 {
+ trip = <&level1_trip>;
+ 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>,
+ <&actmon THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+ };
+ };
+ };
+
+ tsensor1-thermal {
+ status = "disabled";
+
+ polling-delay-passive = <1000>; /* milliseconds */
+ polling-delay = <0>; /* milliseconds */
+
+ thermal-sensors = <&tsensor 1>;
+
+ trips {
+ dvfs-alert {
+ temperature = <80000>;
+ hysteresis = <200>;
+ type = "passive";
+ };
+ };
+ };
+ };
};
--
2.32.0