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/linux/Documentation/devicetree/bindings/hwmon/
H A Daspeed-pwm-tacho.txt9 Required properties for pwm-tacho node:
10 - #address-cells : should be 1.
12 - #size-cells : should be 1.
14 - #cooling-cells: should be 2.
16 - reg : address and length of the register set for the device.
18 - pinctrl-names : a pinctrl state named "default" must be defined.
20 - pinctrl-0 : phandle referencing pin configuration of the PWM ports.
22 - compatible : should be "aspeed,ast2400-pwm-tacho" for AST2400 and
23 "aspeed,ast2500-pwm-tacho" for AST2500.
25 - clocks : phandle to clock provider with the clock number in the second cell
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H A Dnpcm750-pwm-fan.txt3 The Nuvoton BMC NPCM7XX supports 8 Pulse-width modulation (PWM)
6 The Nuvoton BMC NPCM8XX supports 12 Pulse-width modulation (PWM)
9 Required properties for pwm-fan node
10 - #address-cells : should be 1.
11 - #size-cells : should be 0.
12 - compatible : "nuvoton,npcm750-pwm-fan" for Poleg NPCM7XX.
13 : "nuvoton,npcm845-pwm-fan" for Arbel NPCM8XX.
14 - reg : specifies physical base address and size of the registers.
15 - reg-names : must contain:
18 - clocks : phandle of reference clocks.
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H A Dpwm-fan.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/hwmon/pwm-fan.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jean Delvare <jdelvare@suse.com>
11 - Guenter Roeck <linux@roeck-us.net>
15 const: pwm-fan
17 cooling-levels:
18 description: PWM duty cycle values corresponding to thermal cooling states.
19 $ref: /schemas/types.yaml#/definitions/uint32-array
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H A Dfan-common.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/hwmon/fan-common.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Naresh Solanki <naresh.solanki@9elements.com>
11 - Billy Tsai <billy_tsai@aspeedtech.com>
14 max-rpm:
20 min-rpm:
26 pulses-per-revolution:
32 tach-div:
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H A Dti,amc6821.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Farouk Bouabid <farouk.bouabid@cherry.de>
11 - Quentin Schulz <quentin.schulz@cherry.de>
14 Intelligent temperature monitor and pulse-width modulation (PWM) fan
20 - items:
21 - const: tsd,mule
22 - const: ti,amc6821
23 - const: ti,amc6821
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/linux/drivers/hwmon/
H A Dqnap-mcu-hwmon.c1 // SPDX-License-Identifier: GPL-2.0-only
4 * Driver for hwmon elements found on QNAP-MCU devices
10 #include <linux/mfd/qnap-mcu.h>
39 ret = qnap_mcu_exec(hwm->mcu, cmd, sizeof(cmd), reply, sizeof(reply)); in qnap_mcu_hwmon_get_rpm()
45 return -EIO; in qnap_mcu_hwmon_get_rpm()
52 static const u8 cmd[] = { '@', 'F', 'Z', '0' }; /* 0 = fan-id? */ in qnap_mcu_hwmon_get_pwm()
57 ret = qnap_mcu_exec(hwm->mcu, cmd, sizeof(cmd), reply, sizeof(reply)); in qnap_mcu_hwmon_get_pwm()
63 return -EIO; in qnap_mcu_hwmon_get_pwm()
70 const u8 cmd[] = { '@', 'F', 'W', '0', pwm }; /* 0 = fan-id?, pwm 0-255 */ in qnap_mcu_hwmon_set_pwm()
73 return qnap_mcu_exec_with_ack(hwm->mcu, cmd, sizeof(cmd)); in qnap_mcu_hwmon_set_pwm()
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H A Dpwm-fan.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * pwm-fan.c - Hwmon driver for fans connected to PWM lines.
74 atomic_inc(&tach->pulses); in pulse_handler()
82 unsigned int delta = ktime_ms_delta(ktime_get(), ctx->sample_start); in sample_timer()
86 for (i = 0; i < ctx->tach_count; i++) { in sample_timer()
87 struct pwm_fan_tach *tach = &ctx->tachs[i]; in sample_timer()
90 pulses = atomic_read(&tach->pulses); in sample_timer()
91 atomic_sub(pulses, &tach->pulses); in sample_timer()
92 tach->rpm = (unsigned int)(pulses * 1000 * 60) / in sample_timer()
93 (ctx->pulses_per_revolution[i] * delta); in sample_timer()
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/linux/arch/arm64/boot/dts/rockchip/
H A Drk3399-nanopc-t4.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
3 * FriendlyElec NanoPC-T4 board device tree source
11 /dts-v1/;
12 #include "rk3399-nanopi4.dtsi"
15 model = "FriendlyElec NanoPC-T4";
16 compatible = "friendlyarm,nanopc-t4", "rockchip,rk3399";
18 vcc12v0_sys: regulator-vcc12v0-sys {
19 compatible = "regulator-fixed";
20 regulator-always-on;
21 regulator-boot-on;
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/linux/Documentation/devicetree/bindings/thermal/
H A Dthermal-cooling-devices.yaml1 # SPDX-License-Identifier: (GPL-2.0)
4 ---
5 $id: http://devicetree.org/schemas/thermal/thermal-cooling-devices.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: Thermal cooling device
11 - Amit Kucheria <amitk@kernel.org>
15 and the software abstraction of cooling devices and thermal zones required to
20 - thermal-sensor: device that measures temperature, has SoC-specific bindings
21 - cooling-device: device used to dissipate heat either passively or actively
22 - thermal-zones: a container of the following node types used to describe all
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/linux/arch/arm64/boot/dts/renesas/
H A Dr8a779g3-sparrow-hawk-fan-pwm.dtso1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 * on R-Car V4H ES3.0 Sparrow Hawk board
12 * r8a779g3-sparrow-hawk$ grep -H . /sys/class/hwmon/hwmon?/name
21 * # For details, see Linux Documentation/hwmon/pwm-fan.rst
22 * r8a779g3-sparrow-hawk$ echo 2 > /sys/class/hwmon/hwmon4/pwm1_enable
26 * r8a779g3-sparrow-hawk$ echo 101 > /sys/class/hwmon/hwmon4/pwm1
29 /dts-v1/;
34 * see schema Documentation/devicetree/bindings/hwmon/pwm-fan.yaml .
37 /* Available cooling levels */
38 cooling-levels = <0 50 100 150 200 255>;
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/linux/Documentation/driver-api/thermal/
H A Dcpu-cooling-api.rst2 CPU cooling APIs How To
14 The generic cpu cooling(freq clipping) provides registration/unregistration APIs
15 to the caller. The binding of the cooling devices to the trip point is left for
16 the user. The registration APIs returns the cooling device pointer.
18 1. cpu cooling APIs
22 --------------------------------------------
29 This interface function registers the cpufreq cooling device with the name
30 "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
31 cooling devices.
41 This interface function registers the cpufreq cooling device with
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/linux/arch/arm/boot/dts/nuvoton/
H A Dnuvoton-npcm750-runbmc-olympus.dts1 // SPDX-License-Identifier: GPL-2.0
5 /dts-v1/;
6 #include "nuvoton-npcm750.dtsi"
7 #include "nuvoton-npcm750-runbmc-olympus-pincfg.dtsi"
9 #include <dt-bindings/i2c/i2c.h>
10 #include <dt-bindings/gpio/gpio.h>
43 stdout-path = &serial3;
50 iio-hwmon {
51 compatible = "iio-hwmon";
52 io-channels = <&adc 0>, <&adc 1>, <&adc 2>, <&adc 3>,
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H A Dnuvoton-npcm730-gsj.dts1 // SPDX-License-Identifier: GPL-2.0
4 /dts-v1/;
5 #include "nuvoton-npcm730.dtsi"
6 #include "nuvoton-npcm730-gsj-gpio.dtsi"
8 #include <dt-bindings/gpio/gpio.h>
31 stdout-path = &serial3;
39 compatible = "gpio-leds";
41 led-bmc-live {
43 linux,default-trigger = "heartbeat";
48 default-state = "off";
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/linux/Documentation/devicetree/bindings/mfd/
H A Dqnap,ts433-mcu.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/mfd/qnap,ts433-mcu.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: QNAP NAS on-board Microcontroller
10 - Heiko Stuebner <heiko@sntech.de>
19 - qnap,ts433-mcu
22 "^fan-[0-9]+$":
23 $ref: /schemas/hwmon/fan-common.yaml#
27 - compatible
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/linux/arch/arm/boot/dts/samsung/
H A Dexynos4412-odroidu3.dts1 // SPDX-License-Identifier: GPL-2.0
3 * Hardkernel's Exynos4412 based ODROID-U3 board device tree source
7 * Device tree source file for Hardkernel's ODROID-U3 board which is based
11 /dts-v1/;
12 #include <dt-bindings/leds/common.h>
13 #include "exynos4412-odroid-common.dtsi"
14 #include "exynos4412-prime.dtsi"
17 model = "Hardkernel ODROID-U3 board based on Exynos4412";
18 compatible = "hardkernel,odroid-u3", "samsung,exynos4412", "samsung,exynos4";
29 vbus_otg_reg: regulator-1 {
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H A Dexynos5422-odroidxu3-common.dtsi1 // SPDX-License-Identifier: GPL-2.0
3 * Hardkernel Odroid XU3/XU3-Lite/XU4 boards common device tree source
12 #include <dt-bindings/input/input.h>
13 #include "exynos5422-odroid-core.dtsi"
20 gpio-keys {
21 compatible = "gpio-keys";
22 pinctrl-names = "default";
23 pinctrl-0 = <&power_key>;
25 power-key {
36 debounce-interval = <0>;
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/linux/arch/riscv/boot/dts/sophgo/
H A Dsg2042-evb-v2.dts1 // SPDX-License-Identifier: GPL-2.0 OR MIT
8 #include <dt-bindings/gpio/gpio.h>
9 #include <dt-bindings/input/input.h>
13 compatible = "sophgo,sg2042-evb-v2", "sophgo,sg2042";
16 stdout-path = "serial0";
19 pwmfan: pwm-fan {
20 compatible = "pwm-fan";
21 cooling-levels = <103 128 179 230 255>;
23 #cooling-cells = <2>;
26 thermal-zones {
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H A Dsg2042-milkv-pioneer.dts1 // SPDX-License-Identifier: GPL-2.0 OR MIT
8 #include <dt-bindings/gpio/gpio.h>
9 #include <dt-bindings/input/input.h>
12 model = "Milk-V Pioneer";
16 stdout-path = "serial0";
19 gpio-power {
20 compatible = "gpio-keys";
22 key-power {
26 linux,input-type = <EV_KEY>;
27 debounce-interval = <100>;
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H A Dsg2042-evb-v1.dts1 // SPDX-License-Identifier: GPL-2.0 OR MIT
8 #include <dt-bindings/gpio/gpio.h>
9 #include <dt-bindings/input/input.h>
13 compatible = "sophgo,sg2042-evb-v1", "sophgo,sg2042";
16 stdout-path = "serial0";
19 gpio-power {
20 compatible = "gpio-keys";
22 key-power {
26 linux,input-type = <EV_KEY>;
27 debounce-interval = <100>;
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/linux/arch/arm64/boot/dts/amlogic/
H A Dmeson-sm1-odroid-hc4.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
6 /dts-v1/;
8 #include "meson-sm1-odroid.dtsi"
11 compatible = "hardkernel,odroid-hc4", "amlogic,sm1";
12 model = "Hardkernel ODROID-HC4";
19 fan0: pwm-fan {
20 compatible = "pwm-fan";
21 #cooling-cells = <2>;
22 cooling-levels = <0 120 170 220>;
27 compatible = "gpio-leds";
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/linux/arch/loongarch/boot/dts/
H A Dloongson-2k1000-ref.dts1 // SPDX-License-Identifier: GPL-2.0
6 /dts-v1/;
8 #include "dt-bindings/thermal/thermal.h"
9 #include "loongson-2k1000.dtsi"
12 compatible = "loongson,ls2k1000-ref", "loongson,ls2k1000";
13 model = "Loongson-2K1000 Reference Board";
20 stdout-path = "serial0:115200n8";
30 reserved-memory {
31 #address-cells = <2>;
32 #size-cells = <2>;
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/linux/arch/arm64/boot/dts/mediatek/
H A Dmt7988a-bananapi-bpi-r4.dtsi1 // SPDX-License-Identifier: GPL-2.0-only OR MIT
3 /dts-v1/;
5 #include <dt-bindings/gpio/gpio.h>
6 #include <dt-bindings/leds/common.h>
7 #include <dt-bindings/regulator/richtek,rt5190a-regulator.h>
13 stdout-path = "serial0:115200n8";
16 fan: pwm-fan {
17 compatible = "pwm-fan";
18 /* cooling level (0, 1, 2, 3) : (0% duty, 30% duty, 50% duty, 100% duty) */
19 cooling-levels = <0 80 128 255>;
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/linux/arch/arm64/boot/dts/marvell/
H A Darmada-8040-puzzle-m801.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
6 * Device Tree file for IEI Puzzle-M801
9 #include "armada-8040.dtsi"
11 #include <dt-bindings/gpio/gpio.h>
12 #include <dt-bindings/leds/common.h>
15 model = "IEI-Puzzle-M801";
16 …compatible = "iei,puzzle-m801", "marvell,armada8040", "marvell,armada-ap806-quad", "marvell,armada…
28 stdout-path = "serial0:115200n8";
37 v_3_3: regulator-3-3v {
38 compatible = "regulator-fixed";
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/linux/arch/arm64/boot/dts/nvidia/
H A Dtegra234-p3768-0000+p3767.dtsi1 // SPDX-License-Identifier: GPL-2.0
3 #include <dt-bindings/input/linux-event-codes.h>
4 #include <dt-bindings/input/gpio-keys.h>
6 #include "tegra234-p3767.dtsi"
17 stdout-path = "serial0:115200n8";
22 compatible = "nvidia,tegra194-hsuart";
23 reset-names = "serial";
28 compatible = "nvidia,tegra194-hsuart";
29 reset-names = "serial";
41 vcc-supply = <&vdd_1v8_sys>;
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/linux/Documentation/devicetree/bindings/cpufreq/
H A Dqcom-cpufreq-nvmem.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/cpufreq/qcom-cpufreq-nvmem.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Ilia Lin <ilia.lin@kernel.org>
16 CPR provides a power domain with multiple levels that are selected depending
28 - qcom,apq8064
29 - qcom,apq8096
30 - qcom,ipq5332
31 - qcom,ipq6018
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