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j613: CPU thermal zones and SoC die sensors (MacBook Air 13" M3) #146

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Merged
chriskearney merged 4 commits into from
Oct 30, 2026
Merged

j613: CPU thermal zones and SoC die sensors (MacBook Air 13" M3) #146

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730039f
arm64: dts: apple: t8122: Add the CPU power of each OPP
GehrmannSolutions Oct 14, 2026
a7b90bf
arm64: dts: apple: t8122: Add CPU cooling cells and die temperature s…
GehrmannSolutions Oct 14, 2026
30db282
arm64: dts: apple: t8122-j613: Add CPU thermal zones
GehrmannSolutions Oct 14, 2026
8fd1bf4
hwmon: macsmc: SoC die keys for the 13-inch M3 MacBook Air
GehrmannSolutions Oct 14, 2026
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316 changes: 316 additions & 0 deletions arch/arm64/boot/dts/apple/t8122-j613.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
#include "t8122-usbpd-spmi.dtsi"
#include "t8122-jxxx.dtsi"
#include <dt-bindings/leds/common.h>
#include <dt-bindings/thermal/thermal.h>

/ {
compatible = "apple,j613", "apple,t8122", "apple,arm-platform";
Expand All @@ -33,6 +34,321 @@
default-state = "keep";
};
};

/*
* The J613 is fanless: the CPUs are the only cooling devices. As on
* the J700, every die sensor gets a zone that throttles both clusters,
* since they share one die and one heat spreader, and the power
* allocator splits the budget by the energy models, with the E cluster

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* weighted three to one. The E maps stop at cooling state 3 (2004 MHz):
* the E cluster adds at most about 2 W, and the governor would
* otherwise send an idle E cluster to its lowest state.
*
* The trips are the J700's: switch-on 58 C (idle is 43-52 C), control
* 95 C, critical 110 C. sustainable-power comes from load tests with the
* gains derived from it: with the four P cores busy, the J700's 1.5 W
* held the hottest sensor at 72 C and the P cores at 2.1 GHz; 6 W held
* 90-95 C at 2.6-3.0 GHz (one 96.5 C peak); 7.5 W swung between 2.2 and
* 3.6 GHz with peaks of 98 C. With 6 W, all eight cores busy settled at
* 92 C with the P cores at 2.2-2.4 GHz and the E cores at full clock;
* the P cores with the GPU busy at 618 MHz peaked at 97 C (the GPU is
* not a cooling device here).
*/
thermal-zones {
cpu-e0-thermal {
polling-delay-passive = <500>;
polling-delay = <500>;

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[property-order] property 'polling-delay' out of canonical order (should sort before 'polling-delay-passive')
thermal-sensors = <&smc_hwmon 0>; /* Te05 */
sustainable-power = <6000>;

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[property-order] property 'sustainable-power' out of canonical order (should sort before 'thermal-sensors')

trips {
cpu_e0_alert: trip-alert {

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temperature = <58000>;
hysteresis = <2000>;

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[property-order] property 'hysteresis' out of canonical order (should sort before 'temperature')
type = "passive";
};

cpu_e0_control: trip-control {
temperature = <95000>;
hysteresis = <2000>;
type = "passive";
};

trip-critical {
temperature = <110000>;
hysteresis = <0>;
type = "critical";
};
};

cooling-maps {

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map0 {
trip = <&cpu_e0_control>;
cooling-device =

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<&cpu_p0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
contribution = <1024>;

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};

map1 {
trip = <&cpu_e0_control>;
cooling-device =
<&cpu_e0 THERMAL_NO_LIMIT 3>,
<&cpu_e1 THERMAL_NO_LIMIT 3>,
<&cpu_e2 THERMAL_NO_LIMIT 3>,
<&cpu_e3 THERMAL_NO_LIMIT 3>;
contribution = <3072>;
};
};
};

cpu-e1-thermal {
polling-delay-passive = <500>;
polling-delay = <500>;
thermal-sensors = <&smc_hwmon 1>; /* Te0P */
sustainable-power = <6000>;

trips {
cpu_e1_alert: trip-alert {

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temperature = <58000>;
hysteresis = <2000>;
type = "passive";
};

cpu_e1_control: trip-control {
temperature = <95000>;
hysteresis = <2000>;
type = "passive";
};

trip-critical {
temperature = <110000>;
hysteresis = <0>;
type = "critical";
};
};

cooling-maps {
map0 {
trip = <&cpu_e1_control>;
cooling-device =
<&cpu_p0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
contribution = <1024>;
};

map1 {
trip = <&cpu_e1_control>;
cooling-device =
<&cpu_e0 THERMAL_NO_LIMIT 3>,
<&cpu_e1 THERMAL_NO_LIMIT 3>,
<&cpu_e2 THERMAL_NO_LIMIT 3>,
<&cpu_e3 THERMAL_NO_LIMIT 3>;
contribution = <3072>;
};
};
};

cpu-p0-thermal {
polling-delay-passive = <500>;
polling-delay = <500>;
thermal-sensors = <&smc_hwmon 2>; /* Tp05 */
sustainable-power = <6000>;

trips {
cpu_p0_alert: trip-alert {
temperature = <58000>;
hysteresis = <2000>;
type = "passive";
};

cpu_p0_control: trip-control {
temperature = <95000>;
hysteresis = <2000>;
type = "passive";
};

trip-critical {
temperature = <110000>;
hysteresis = <0>;
type = "critical";
};
};

cooling-maps {
map0 {
trip = <&cpu_p0_control>;
cooling-device =
<&cpu_p0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
contribution = <1024>;
};

map1 {
trip = <&cpu_p0_control>;
cooling-device =
<&cpu_e0 THERMAL_NO_LIMIT 3>,
<&cpu_e1 THERMAL_NO_LIMIT 3>,
<&cpu_e2 THERMAL_NO_LIMIT 3>,
<&cpu_e3 THERMAL_NO_LIMIT 3>;
contribution = <3072>;
};
};
};

cpu-p1-thermal {
polling-delay-passive = <500>;
polling-delay = <500>;
thermal-sensors = <&smc_hwmon 3>; /* Tp0L */
sustainable-power = <6000>;

trips {
cpu_p1_alert: trip-alert {
temperature = <58000>;
hysteresis = <2000>;
type = "passive";
};

cpu_p1_control: trip-control {
temperature = <95000>;
hysteresis = <2000>;
type = "passive";
};

trip-critical {
temperature = <110000>;
hysteresis = <0>;
type = "critical";
};
};

cooling-maps {
map0 {
trip = <&cpu_p1_control>;
cooling-device =
<&cpu_p0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
contribution = <1024>;
};

map1 {
trip = <&cpu_p1_control>;
cooling-device =
<&cpu_e0 THERMAL_NO_LIMIT 3>,
<&cpu_e1 THERMAL_NO_LIMIT 3>,
<&cpu_e2 THERMAL_NO_LIMIT 3>,
<&cpu_e3 THERMAL_NO_LIMIT 3>;
contribution = <3072>;
};
};
};

cpu-p2-thermal {
polling-delay-passive = <500>;
polling-delay = <500>;
thermal-sensors = <&smc_hwmon 4>; /* Tp0b */
sustainable-power = <6000>;

trips {
cpu_p2_alert: trip-alert {
temperature = <58000>;
hysteresis = <2000>;
type = "passive";
};

cpu_p2_control: trip-control {
temperature = <95000>;
hysteresis = <2000>;
type = "passive";
};

trip-critical {
temperature = <110000>;
hysteresis = <0>;
type = "critical";
};
};

cooling-maps {
map0 {
trip = <&cpu_p2_control>;
cooling-device =
<&cpu_p0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
contribution = <1024>;
};

map1 {
trip = <&cpu_p2_control>;
cooling-device =
<&cpu_e0 THERMAL_NO_LIMIT 3>,
<&cpu_e1 THERMAL_NO_LIMIT 3>,
<&cpu_e2 THERMAL_NO_LIMIT 3>,
<&cpu_e3 THERMAL_NO_LIMIT 3>;
contribution = <3072>;
};
};
};

cpu-p3-thermal {
polling-delay-passive = <500>;
polling-delay = <500>;
thermal-sensors = <&smc_hwmon 5>; /* Tp0r */
sustainable-power = <6000>;

trips {
cpu_p3_alert: trip-alert {
temperature = <58000>;
hysteresis = <2000>;
type = "passive";
};

cpu_p3_control: trip-control {
temperature = <95000>;
hysteresis = <2000>;
type = "passive";
};

trip-critical {
temperature = <110000>;
hysteresis = <0>;
type = "critical";
};
};

cooling-maps {
map0 {
trip = <&cpu_p3_control>;
cooling-device =
<&cpu_p0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
<&cpu_p3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
contribution = <1024>;
};

map1 {
trip = <&cpu_p3_control>;
cooling-device =
<&cpu_e0 THERMAL_NO_LIMIT 3>,
<&cpu_e1 THERMAL_NO_LIMIT 3>,
<&cpu_e2 THERMAL_NO_LIMIT 3>,
<&cpu_e3 THERMAL_NO_LIMIT 3>;
contribution = <3072>;
};
};
};
};
};

&dcp {
Expand Down Expand Up @@ -245,7 +561,7 @@
enable-gpios = <&pinctrl_nub 29 GPIO_ACTIVE_HIGH>;
spi-cs-setup-delay-ns = <20>;
spi-cs-hold-delay-ns = <20>;
/* Per-device factory data from this Mac's own iBoot system container. */

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firmware-name = "apple/mesacal-j613.bin";
};

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