[PATCH v2 10/11] arm64: dts: apple: Add common hwmon sensors and fans

James Calligeros
2025-08-27T11:23:59Z

Each Apple Silicon device exposes a unique set of sensors and fans,
however some have been found to be reliably common across devices.

Add these as .dtsi files so that they can be combined with any
device-specific sensors without excessive repetition.

Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
---
.../boot/dts/apple/hwmon-common.dtsi | 37 +++++++++++++++++++++++++
.../boot/dts/apple/hwmon-fan-dual.dtsi | 24 ++++++++++++++++
arch/arm64/boot/dts/apple/hwmon-fan.dtsi | 19 +++++++++++++
.../boot/dts/apple/hwmon-laptop.dtsi | 35 +++++++++++++++++++++++
.../boot/dts/apple/hwmon-mac-mini.dtsi | 17 ++++++++++++
5 files changed, 132 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/hwmon-common.dtsi b/arch/arm64/boot/dts/apple/hwmon-common.dtsi
new file mode 100644
index 0000000000000000000000000000000000000000..bac4e44d3f9892fe8ad04125e47dcccb2bcf57a0
--- /dev/null
+++ b/arch/arm64/boot/dts/apple/hwmon-common.dtsi
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Hardawre monitoring sensors expected to be found on all Apple Silicon devices
+ *
+ * Copyright The Asahi Linux Contributors
+ */
+
+&smc {
+ hwmon {
+ compatible = "apple,smc-hwmon";
+
+ current-ID0R {
+ apple,key-id = "ID0R";
+ label = "AC Input Current";
+ };
+ power-PSTR {
+ apple,key-id = "PSTR";
+ label = "Total System Power";
+ };
+ power-PDTR {
+ apple,key-id = "PDTR";
+ label = "AC Input Power";
+ };
+ power-PMVR {
+ apple,key-id = "PMVR";
+ label = "3.8 V Rail Power";
+ };
+ temperature-TH0x {
+ apple,key-id = "TH0x";
+ label = "NAND Flash Temperature";
+ };
+ voltage-VD0R {
+ apple,key-id = "VD0R";
+ label = "AC Input Voltage";
+ };
+ };
+};
diff --git a/arch/arm64/boot/dts/apple/hwmon-fan-dual.dtsi b/arch/arm64/boot/dts/apple/hwmon-fan-dual.dtsi
new file mode 100644
index 0000000000000000000000000000000000000000..f81047725de473b85d8f337af63fa10d3aa827a0
--- /dev/null
+++ b/arch/arm64/boot/dts/apple/hwmon-fan-dual.dtsi
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * SMC hwmon fan keys for Apple Silicon desktops/laptops with two fans
+ *
+ * Copyright The Asahi Linux Contributors
+ */
+
+#include "hwmon-fan.dtsi"
+
+&smc {
+ hwmon {
+ fan-F0Ac {
+ label = "Fan 1";
+ };
+ fan-F1Ac {
+ apple,key-id = "F1Ac";
+ label = "Fan 2";
+ apple,fan-minimum = "F1Mn";
+ apple,fan-maximum = "F1Mx";
+ apple,fan-target = "F1Tg";
+ apple,fan-mode = "F1Md";
+ };
+ };
+};
diff --git a/arch/arm64/boot/dts/apple/hwmon-fan.dtsi b/arch/arm64/boot/dts/apple/hwmon-fan.dtsi
new file mode 100644
index 0000000000000000000000000000000000000000..ae5e1a54b6b780ff880ca0a39bc2712d8cbafbe4
--- /dev/null
+++ b/arch/arm64/boot/dts/apple/hwmon-fan.dtsi
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * hwmon fan keys for Apple Silicon desktops/laptops with a single fan.
+ *
+ * Copyright The Asahi Linux Contributors
+ */
+
+&smc {
+ hwmon {
+ fan-F0Ac {
+ apple,key-id = "F0Ac";
+ label = "Fan";
+ apple,fan-minimum = "F0Mn";
+ apple,fan-maximum = "F0Mx";
+ apple,fan-target = "F0Tg";
+ apple,fan-mode = "F0Md";
+ };
+ };
+};
diff --git a/arch/arm64/boot/dts/apple/hwmon-laptop.dtsi b/arch/arm64/boot/dts/apple/hwmon-laptop.dtsi
new file mode 100644
index 0000000000000000000000000000000000000000..227dc5065bb2b74d9699019b71eed90501e1b4b1
--- /dev/null
+++ b/arch/arm64/boot/dts/apple/hwmon-laptop.dtsi
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Hardware monitoring sensors expected on all Apple Silicon laptops
+ *
+ * Copyright The Asahi Linux Contributors
+ */
+
+&smc {
+ hwmon {
+ power-PHPC {
+ apple,key-id = "PHPC";
+ label = "Heatpipe Power";
+ };
+ temperature-TB0T {
+ apple,key-id = "TB0T";
+ label = "Battery Hotspot Temperature";
+ };
+ temperature-TCHP {
+ apple,key-id = "TCHP";
+ label = "Charge Regulator Temperature";
+ };
+ temperature-TW0P {
+ apple,key-id = "TW0P";
+ label = "WiFi/BT Module Temperature";
+ };
+ voltage-SBAV {
+ apple,key-id = "SBAV";
+ label = "Battery Voltage";
+ };
+ voltage-VD0R {
+ apple,key-id = "VD0R";
+ label = "Charger Input Voltage";
+ };
+ };
+};
diff --git a/arch/arm64/boot/dts/apple/hwmon-mac-mini.dtsi b/arch/arm64/boot/dts/apple/hwmon-mac-mini.dtsi
new file mode 100644
index 0000000000000000000000000000000000000000..6344deff06ebb9c1b0fbbf6b986db879eb5f19cc
--- /dev/null
+++ b/arch/arm64/boot/dts/apple/hwmon-mac-mini.dtsi
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * hwmon sensors expected on all Mac mini models
+ *
+ * Copyright The Asahi Linux Contributors
+ */
+
+#include "hwmon-fan.dtsi"
+
+&smc {
+ hwmon {
+ temperature-TW0P {
+ apple,key-id = "TW0P";
+ label = "WiFi/BT Module Temperature";
+ };
+ };
+};

--
2.51.0