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Merge branch 'bits/110-smc' into asahi-wip
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‎Documentation/devicetree/bindings/hwmon/apple,smc-hwmon.yaml‎

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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/hwmon/apple,smc-hwmon.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Apple SMC Hardware Monitoring
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description:
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Apple's System Management Controller (SMC) exposes a vast array of
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hardware monitoring sensors, including temperature probes, current and
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voltage sense, power meters, and fan speeds. It also provides endpoints
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to manually control the speed of each fan individually. Each Apple
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Silicon device exposes a different set of endpoints via SMC keys. This
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is true even when two machines share an SoC. The CPU core temperature
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sensor keys on an M1 Mac mini are different to those on an M1 MacBook
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Pro, for example.
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maintainers:
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- James Calligeros <jcalligeros99@gmail.com>
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$defs:
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sensor:
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type: object
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properties:
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apple,key-id:
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$ref: /schemas/types.yaml#/definitions/string
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pattern: "^[A-Za-z0-9]{4}$"
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description: The SMC FourCC key of the desired sensor.
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Must match the node's suffix.
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label:
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description: Human-readable name for the sensor
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required:
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- apple,key-id
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properties:
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compatible:
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const: apple,smc-hwmon
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patternProperties:
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"^current-[A-Za-z0-9]{4}$":
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$ref: "#/$defs/sensor"
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unevaluatedProperties: false
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"^fan-[A-Za-z0-9]{4}$":
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$ref: "#/$defs/sensor"
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unevaluatedProperties: false
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properties:
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apple,fan-minimum:
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$ref: /schemas/types.yaml#/definitions/string
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pattern: "^[A-Za-z0-9]{4}$"
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description: SMC key containing the fan's minimum speed
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apple,fan-maximum:
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$ref: /schemas/types.yaml#/definitions/string
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pattern: "^[A-Za-z0-9]{4}$"
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description: SMC key containing the fan's maximum speed
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apple,fan-target:
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$ref: /schemas/types.yaml#/definitions/string
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pattern: "^[A-Za-z0-9]{4}$"
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description: Writeable endpoint for setting desired fan speed
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apple,fan-mode:
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$ref: /schemas/types.yaml#/definitions/string
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pattern: "^[A-Za-z0-9]{4}$"
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description: Writeable key to enable/disable manual fan control
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"^power-[A-Za-z0-9]{4}$":
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$ref: "#/$defs/sensor"
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unevaluatedProperties: false
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"^temperature-[A-Za-z0-9]{4}$":
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$ref: "#/$defs/sensor"
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unevaluatedProperties: false
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"^voltage-[A-Za-z0-9]{4}$":
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$ref: "#/$defs/sensor"
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unevaluatedProperties: false
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additionalProperties: false

‎Documentation/devicetree/bindings/mfd/apple,smc.yaml‎

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reboot:
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$ref: /schemas/power/reset/apple,smc-reboot.yaml
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rtc:
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$ref: /schemas/rtc/apple,smc-rtc.yaml
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hwmon:
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$ref: /schemas/hwmon/apple,smc-hwmon.yaml
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additionalProperties: false
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required:
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nvmem-cell-names = "shutdown_flag", "boot_stage",
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"boot_error_count", "panic_count";
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};
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rtc {
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compatible = "apple,smc-rtc";
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nvmem-cells = <&rtc_offset>;
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nvmem-cell-names = "rtc_offset";
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};
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hwmon {
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compatible = "apple,smc-hwmon";
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current-ID0R {
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apple,key-id = "ID0R";
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label = "AC Input Current";
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};
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fan-F0Ac {
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apple,key-id = "F0Ac";
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apple,fan-minimum = "F0Mn";
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apple,fan-maximum = "F0Mx";
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apple,fan-target = "F0Tg";
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apple,fan-mode = "F0Md";
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label = "Fan 1";
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};
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power-PSTR {
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apple,key-id = "PSTR";
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label = "Total System Power";
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};
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temperature-TW0P {
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apple,key-id = "TW0P";
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label = "WiFi/BT Module Temperature";
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};
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voltage-VD0R {
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apple,key-id = "VD0R";
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label = "AC Input Voltage";
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};
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};
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};
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};

‎Documentation/devicetree/bindings/rtc/apple,smc-rtc.yaml‎

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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/rtc/apple,smc-rtc.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Apple SMC RTC
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description:
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Apple Silicon Macs (M1, etc.) have an RTC that is part of the PMU IC,
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but most of the PMU functionality is abstracted out by the SMC.
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An additional RTC offset stored inside NVMEM is required to compute
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the current date/time.
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maintainers:
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- Sven Peter <sven@kernel.org>
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properties:
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compatible:
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const: apple,smc-rtc
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nvmem-cells:
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items:
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- description: 48bit RTC offset, specified in 32768 (2^15) Hz clock ticks
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nvmem-cell-names:
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items:
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- const: rtc_offset
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required:
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- compatible
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- nvmem-cells
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- nvmem-cell-names
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additionalProperties: false

‎Documentation/hwmon/macsmc-hwmon.rst‎

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.. SPDX-License-Identifier: GPL-2.0-only
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Kernel driver macsmc-hwmon
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==========================
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Supported hardware
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* Apple Silicon Macs (M1 and up)
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Author: James Calligeros <jcalligeros99@gmail.com>
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Description
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-----------
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macsmc-hwmon exposes the Apple System Management controller's
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temperature, voltage, current and power sensors, as well as
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fan speed and control capabilities, via hwmon.
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Because each Apple Silicon Mac exposes a different set of sensors
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(e.g. the MacBooks expose battery telemetry that is not present on
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the desktop Macs), sensors present on any given machine are described
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via Devicetree. The driver picks these up and registers them with
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hwmon when probed.
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Manual fan speed is supported via the fan_control module parameter. This
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is disabled by default and marked as unsafe, as it cannot be proven that
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the system will fail safe if overheating due to manual fan control being
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used.
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sysfs interface
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---------------
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currX_input
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Ammeter value
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currX_label
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Ammeter label
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fanX_input
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Current fan speed
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fanX_label
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Fan label
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fanX_min
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Minimum possible fan speed
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fanX_max
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Maximum possible fan speed
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fanX_target
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Current fan setpoint
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inX_input
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Voltmeter value
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inX_label
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Voltmeter label
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powerX_input
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Power meter value
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powerX_label
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Power meter label
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tempX_input
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Temperature sensor value
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tempX_label
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Temperature sensor label
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‎MAINTAINERS‎

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@@ -2423,6 +2423,7 @@ F: Documentation/devicetree/bindings/cpufreq/apple,cluster-cpufreq.yaml
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F: Documentation/devicetree/bindings/dma/apple,admac.yaml
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F: Documentation/devicetree/bindings/gpio/apple,smc-gpio.yaml
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F: Documentation/devicetree/bindings/gpu/apple,agx.yaml
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F: Documentation/devicetree/bindings/hwmon/apple,smc-hwmon.yaml
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F: Documentation/devicetree/bindings/i2c/apple,i2c.yaml
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F: Documentation/devicetree/bindings/input/touchscreen/apple,z2-multitouch.yaml
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F: Documentation/devicetree/bindings/interrupt-controller/apple,*
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F: Documentation/devicetree/bindings/power/apple*
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F: Documentation/devicetree/bindings/power/reset/apple,smc-reboot.yaml
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F: Documentation/devicetree/bindings/pwm/apple,s5l-fpwm.yaml
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F: Documentation/devicetree/bindings/rtc/apple,smc-rtc.yaml
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F: Documentation/devicetree/bindings/spi/apple,spi.yaml
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F: Documentation/devicetree/bindings/spmi/apple,spmi.yaml
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F: Documentation/devicetree/bindings/usb/apple,dwc3.yaml
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F: Documentation/devicetree/bindings/watchdog/apple,wdt.yaml
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F: Documentation/hwmon/macsmc-hwmon.rst
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F: arch/arm64/boot/dts/apple/
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F: drivers/bluetooth/hci_bcm4377.c
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F: drivers/clk/clk-apple-nco.c
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F: drivers/cpufreq/apple-soc-cpufreq.c
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F: drivers/dma/apple-admac.c
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F: drivers/gpio/gpio-macsmc.c
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F: drivers/hwmon/macsmc-hwmon.c
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F: drivers/pmdomain/apple/
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F: drivers/i2c/busses/i2c-pasemi-core.c
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F: drivers/i2c/busses/i2c-pasemi-platform.c
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F: drivers/input/misc/macsmc-input.c
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F: drivers/input/touchscreen/apple_z2.c
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F: drivers/iommu/apple-dart.c
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F: drivers/iommu/io-pgtable-dart.c
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F: drivers/pinctrl/pinctrl-apple-gpio.c
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F: drivers/power/reset/macsmc-reboot.c
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F: drivers/pwm/pwm-apple.c
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F: drivers/rtc/rtc-macsmc.c
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F: drivers/soc/apple/*
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F: drivers/spi/spi-apple.c
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F: drivers/spmi/spmi-apple-controller.c

‎drivers/hwmon/Kconfig‎

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If you say yes here you get support for the temperature
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sensor inside your CPU.
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config SENSORS_MACSMC_HWMON
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tristate "Apple SMC (Apple Silicon)"
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depends on MFD_MACSMC && OF
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help
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This driver enables hwmon support for current, power, temperature,
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and voltage sensors, as well as fan speed reporting and control
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on Apple Silicon devices. Say Y here if you have an Apple Silicon
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device.
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This driver can also be built as a module. If so, the module will
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be called macsmc-hwmon.
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config SENSORS_MAX1111
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tristate "Maxim MAX1111 Serial 8-bit ADC chip and compatibles"
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depends on SPI_MASTER

‎drivers/hwmon/Makefile‎

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obj-$(CONFIG_SENSORS_LTC4261) += ltc4261.o
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obj-$(CONFIG_SENSORS_LTC4282) += ltc4282.o
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obj-$(CONFIG_SENSORS_LTQ_CPUTEMP) += ltq-cputemp.o
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obj-$(CONFIG_SENSORS_MACSMC_HWMON) += macsmc-hwmon.o
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obj-$(CONFIG_SENSORS_MAX1111) += max1111.o
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obj-$(CONFIG_SENSORS_MAX127) += max127.o
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obj-$(CONFIG_SENSORS_MAX16065) += max16065.o

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