linux-kernel - [PATCH v3 11/13] arm64: dts: apple: t8103, t8112, t60xx: add hwmon SMC subdevice

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Message-Id: <20251007-macsmc-subdevs-v3-11-d7d3bfd7ae02@gmail.com>
Date: Tue, 07 Oct 2025 21:16:52 +1000
From: James Calligeros <jcalligeros99@...il.com>
To: Sven Peter <sven@...nel.org>, Janne Grunau <j@...nau.net>, 
 Alyssa Rosenzweig <alyssa@...enzweig.io>, Neal Gompa <neal@...pa.dev>, 
 Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>, 
 Dmitry Torokhov <dmitry.torokhov@...il.com>, 
 Jonathan Corbet <corbet@....net>, 
 James Calligeros <jcalligeros99@...il.com>
Cc: asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-rtc@...r.kernel.org, linux-hwmon@...r.kernel.org, 
 linux-input@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH v3 11/13] arm64: dts: apple: t8103, t8112, t60xx: add hwmon
 SMC subdevice

Apple's System Management Controller integrates numerous sensors
that can be exposed via hwmon. Add the subdevice and compatible
in preparation for the sensors that need to be described
for each device.

Signed-off-by: James Calligeros <jcalligeros99@...il.com>
---
 .../arm64/boot/dts/apple/t600x-die0.dtsi | 4 ++++
 .../arm64/boot/dts/apple/t602x-die0.dtsi | 4 ++++
 arch/arm64/boot/dts/apple/t8103.dtsi     | 4 ++++
 arch/arm64/boot/dts/apple/t8112.dtsi     | 4 ++++
 4 files changed, 16 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/t600x-die0.dtsi b/arch/arm64/boot/dts/apple/t600x-die0.dtsi
index f715b19efd16..e6647c1a9173 100644
--- a/arch/arm64/boot/dts/apple/t600x-die0.dtsi
+++ b/arch/arm64/boot/dts/apple/t600x-die0.dtsi
@@ -37,6 +37,10 @@ smc_gpio: gpio {
 			#gpio-cells = <2>;
 		};
 
+		smc_hwmon: hwmon {
+			compatible = "apple,smc-hwmon";
+		};
+
 		smc_reboot: reboot {
 			compatible = "apple,smc-reboot";
 			nvmem-cells = <&shutdown_flag>, <&boot_stage>,
diff --git a/arch/arm64/boot/dts/apple/t602x-die0.dtsi b/arch/arm64/boot/dts/apple/t602x-die0.dtsi
index 8622ddea7b44..680c103c1c0f 100644
--- a/arch/arm64/boot/dts/apple/t602x-die0.dtsi
+++ b/arch/arm64/boot/dts/apple/t602x-die0.dtsi
@@ -114,6 +114,10 @@ smc_gpio: gpio {
 			#gpio-cells = <2>;
 		};
 
+		smc_hwmon: hwmon {
+			compatible = "apple,smc-hwmon";
+		};
+
 		smc_reboot: reboot {
 			compatible = "apple,smc-reboot";
 			nvmem-cells = <&shutdown_flag>, <&boot_stage>,
diff --git a/arch/arm64/boot/dts/apple/t8103.dtsi b/arch/arm64/boot/dts/apple/t8103.dtsi
index 59f2678639cf..78eb931d6fb7 100644
--- a/arch/arm64/boot/dts/apple/t8103.dtsi
+++ b/arch/arm64/boot/dts/apple/t8103.dtsi
@@ -909,6 +909,10 @@ smc_gpio: gpio {
 				#gpio-cells = <2>;
 			};
 
+			smc_hwmon: hwmon {
+				compatible = "apple,smc-hwmon";
+			};
+
 			smc_reboot: reboot {
 				compatible = "apple,smc-reboot";
 				nvmem-cells = <&shutdown_flag>, <&boot_stage>,
diff --git a/arch/arm64/boot/dts/apple/t8112.dtsi b/arch/arm64/boot/dts/apple/t8112.dtsi
index 6bc3f58b06f7..5a8fa6daa00a 100644
--- a/arch/arm64/boot/dts/apple/t8112.dtsi
+++ b/arch/arm64/boot/dts/apple/t8112.dtsi
@@ -912,6 +912,10 @@ smc_gpio: gpio {
 				#gpio-cells = <2>;
 			};
 
+			smc_hwmon: hwmon {
+				compatible = "apple,smc-hwmon";
+			};
+
 			smc_reboot: reboot {
 				compatible = "apple,smc-reboot";
 				nvmem-cells = <&shutdown_flag>, <&boot_stage>,

-- 
2.51.0