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/linux/Documentation/devicetree/bindings/arm/bcm/
H A Draspberrypi,bcm2835-firmware.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/arm/bcm/raspberrypi,bcm2835-firmware.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Eric Anholt <eric@anholt.net>
11 - Stefan Wahren <wahrenst@gmx.net>
17 const: raspberrypi,bcm2835-firmware
20 - compatible
25 - const: raspberrypi,bcm2835-firmware
26 - const: simple-mfd
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/linux/drivers/hwmon/
H A Dmlxreg-fan.c1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
27 * FAN datasheet defines the formula for RPM calculations as RPM = 15/t-high.
28 * The logic in a programmable device measures the time t-high by sampling the
29 * tachometer every t-sample (with the default value 11.32 uS) and increment
31 * RPM = 15 / (t-sample * (K + Regval)), where:
33 * - 0xff - represents tachometer fault;
34 * - 0xfe - represents tachometer minimum value , which is 4444 RPM;
35 * - 0x00 - represents tachometer maximum value , which is 300000 RPM;
39 * used: RPM = 15 / ((Regval + K) * 11.32) * 10^(-6)), which in the
42 * - for Regval 0x00, RPM will be 15000000 * 100 / (44 * 1132) = 30115;
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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.
18 #include <linux/pwm.h>
43 struct pwm_device *pwm; member
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()
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H A Dnzxt-smart2.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Reverse-engineered NZXT RGB & Fan Controller/Smart Device v2 driver.
77 * a 2-byte output report { 0x60, 0x03 }.
85 /* Fan type as detected by the device. See FAN_TYPE_* enum. */
90 * The device sends these reports at a fixed interval (update interval) -
91 * one report with type = FAN_STATUS_REPORT_SPEED, and one report with type =
98 u8 type; member
100 /* Fan type as detected by the device. See FAN_TYPE_* enum. */
104 /* When type == FAN_STATUS_REPORT_SPEED */
112 * Fan duty cycle, in percent. Non-zero even for
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H A Daspeed-pwm-tacho.c1 // SPDX-License-Identifier: GPL-2.0-or-later
11 #include <linux/hwmon-sysfs.h>
22 /* ASPEED PWM & FAN Tach Register Definition */
47 /* ASPEED_PTCR_CTRL : 0x00 - General Control Register */
74 /* ASPEED_PTCR_CLK_CTRL : 0x04 - Clock Control Register */
75 /* TYPE N */
80 /* TYPE M */
87 * ASPEED_PTCR_DUTY_CTRL/1/2/3 : 0x08/0x0C/0x48/0x4C - PWM-FAN duty control
97 /* ASPEED_PTCR_TYPEM_CTRL : 0x10/0x18/0x50 - Type M/N/O Ctrl 0 Register */
105 /* ASPEED_PTCR_TACH_SOURCE : 0x20/0x60 - Tach Source Register */
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H A Daxi-fan-control.c1 // SPDX-License-Identifier: GPL-2.0
9 #include <linux/fpga/adi-axi-common.h>
11 #include <linux/hwmon-sysfs.h>
66 iowrite32(val, ctl->base + reg); in axi_iowrite()
72 return ioread32(ctl->base + reg); in axi_ioread()
77 * T = /raw * 509.3140064 / 65535) - 280.2308787
83 u32 temp = axi_ioread(attr->index, ctl); in axi_fan_control_show()
85 temp = DIV_ROUND_CLOSEST_ULL(temp * 509314ULL, 65535) - 280230; in axi_fan_control_show()
103 axi_iowrite(temp, attr->index, ctl); in axi_fan_control_store()
148 return DIV_ROUND_CLOSEST(60 * ctl->clk_rate, ctl->ppr * tach); in axi_fan_control_get_fan_rpm()
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H A Dlm85.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * lm85.c - Part of lm_sensors, Linux kernel modules for hardware
7 * Copyright (c) 2003 Margit Schubert-While <margitsw@t-online.de>
9 * Copyright (C) 2007--2014 Jean Delvare <jdelvare@suse.de>
21 #include <linux/hwmon-vid.h>
22 #include <linux/hwmon-sysfs.h>
59 ((data)->type == adt7468 && !((data)->cfg5 & ADT7468_OFF64))
61 ((data)->type == adt7468 && !((data)->cfg5 & ADT7468_HFPWM))
105 #define EMC6D100_REG_IN(nr) (0x70 + ((nr) - 5))
106 #define EMC6D100_REG_IN_MIN(nr) (0x73 + ((nr) - 5) * 2)
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/linux/drivers/pwm/
H A Dpwm-cros-ec.c1 // SPDX-License-Identifier: GPL-2.0
3 * Expose a PWM controlled by the ChromeOS EC to the host processor.
13 #include <linux/pwm.h>
16 #include <dt-bindings/mfd/cros_ec.h>
19 * struct cros_ec_pwm_device - Driver data for EC PWM
22 * @use_pwm_type: Use PWM types instead of generic channels
44 return -EINVAL; in cros_ec_dt_type_to_pwm_type()
51 struct cros_ec_device *ec = ec_pwm->ec; in cros_ec_pwm_set_duty()
62 msg->version = 0; in cros_ec_pwm_set_duty()
63 msg->command = EC_CMD_PWM_SET_DUTY; in cros_ec_pwm_set_duty()
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/linux/Documentation/hwmon/
H A Dnct6775.rst19 * Nuvoton NCT5572D/NCT6771F/NCT6772F/NCT6775F/W83677HG-I
83 * Nuvoton NCT6796D-S/NCT6799D-R
93 Guenter Roeck <linux@roeck-us.net>
96 -----------
103 PCH, and SMBUS. Depending on the chip type, 2 to 6 of the temperature sources
117 value. Alarms are only supported for temp1 to temp6, depending on the chip type.
138 The mode works for fan1-fan5.
141 ----------------
143 pwm[1-7]
144 - this file stores PWM duty cycle or DC value (fan speed) in range:
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H A Ddme1737.rst18 Addresses scanned: none, address read from Super-I/O config space
34 Addresses scanned: none, address read from Super-I/O config space
43 -----------------
47 and PWM output control functions. Using this parameter
52 Include non-standard LPC addresses 0x162e and 0x164e
55 - VIA EPIA SN18000
59 -----------
63 and SCH5127 Super-I/O chips. These chips feature monitoring of 3 temp sensors
64 temp[1-3] (2 remote diodes and 1 internal), 8 voltages in[0-7] (7 external and
65 1 internal) and up to 6 fan speeds fan[1-6]. Additionally, the chips implement
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H A Dvt1211.rst10 Addresses scanned: none, address read from Super-I/O config space
24 -----------------
29 configuration for channels 1-5.
30 Legal values are in the range of 0-31. Bit 0 maps to
47 -----------
49 The VIA VT1211 Super-I/O chip includes complete hardware monitoring
52 implements 5 universal input channels (UCH1-5) that can be individually
60 connected to the PWM outputs of the VT1211 :-().
70 UCH1/Reading2 in0 temp3 NTC type thermistor
80 ------------------
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/linux/Documentation/devicetree/bindings/timer/
H A Dingenic,tcu.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 Documentation/arch/mips/ingenic-tcu.rst.
14 - Paul Cercueil <paul@crapouillou.net>
21 - ingenic,jz4740-tcu
22 - ingenic,jz4725b-tcu
23 - ingenic,jz4760-tcu
24 - ingenic,jz4760b-tcu
25 - ingenic,jz4770-tcu
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H A Dti,timer-dm.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/timer/ti,timer-dm.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: TI dual-mode timer
10 - Tony Lindgren <tony@atomide.com>
13 The TI dual-mode timer is a general purpose timer with PWM capabilities.
18 - items:
19 - enum:
20 - ti,am335x-timer
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/linux/Documentation/devicetree/bindings/leds/backlight/
H A Dmediatek,mt6370-backlight.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/mediatek,mt6370-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - ChiaEn Wu <chiaen_wu@richtek.com>
21 - $ref: common.yaml#
26 - mediatek,mt6370-backlight
27 - mediatek,mt6372-backlight
29 default-brightness:
32 max-brightness:
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/linux/Documentation/driver-api/
H A Dmiscellaneous.rst4 .. kernel-doc:: include/linux/parport.h
7 .. kernel-doc:: drivers/parport/ieee1284.c
10 .. kernel-doc:: drivers/parport/share.c
13 .. kernel-doc:: drivers/parport/daisy.c
19 .. kernel-doc:: drivers/tty/serial/8250/8250_core.c
24 Pulse-Width Modulation (PWM)
27 Pulse-width modulation is a modulation technique primarily used to
30 The PWM framework provides an abstraction for providers and consumers of
31 PWM signals. A controller that provides one or more PWM signals is
32 registered as :c:type:`struct pwm_chip <pwm_chip>`. Providers
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/linux/Documentation/devicetree/bindings/mfd/
H A Dairoha,en7581-gpio-sysctl.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/mfd/airoha,en7581-gpio-sysctl.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Christian Marangi <ansuelsmth@gmail.com>
11 - Lorenzo Bianconi <lorenzo@kernel.org>
15 for controlling the GPIO, pins and PWM of the SoC.
20 - const: airoha,en7581-gpio-sysctl
21 - const: syscon
22 - const: simple-mfd
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H A Dst,stmpe.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 touchscreen, ADC, PWM or rotator. It can contain one or several different
15 - Linus Walleij <linus.walleij@linaro.org>
18 - $ref: /schemas/spi/spi-peripheral-props.yaml#
23 - st,stmpe601
24 - st,stmpe801
25 - st,stmpe811
26 - st,stmpe1600
[all …]
/linux/drivers/input/misc/
H A Dpwm-beeper.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
4 * PWM beeper driver
14 #include <linux/pwm.h>
20 struct pwm_device *pwm; member
36 pwm_get_state(beeper->pwm, &state); in pwm_beeper_on()
42 error = pwm_apply_might_sleep(beeper->pwm, &state); in pwm_beeper_on()
46 if (!beeper->amplifier_on) { in pwm_beeper_on()
47 error = regulator_enable(beeper->amplifier); in pwm_beeper_on()
49 pwm_disable(beeper->pwm); in pwm_beeper_on()
[all …]
H A Dmax8997_haptic.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * MAX8997-haptic controller driver
15 #include <linux/pwm.h>
17 #include <linux/mfd/max8997-private.h>
44 struct pwm_device *pwm; member
48 enum max8997_haptic_motor_type type; member
60 if (chip->mode == MAX8997_EXTERNAL_MODE) { in max8997_haptic_set_duty_cycle()
61 unsigned int duty = chip->pwm_period * chip->level / 100; in max8997_haptic_set_duty_cycle()
62 ret = pwm_config(chip->pwm, duty, chip->pwm_period); in max8997_haptic_set_duty_cycle()
66 duty_index = DIV_ROUND_UP(chip->level * 64, 100); in max8997_haptic_set_duty_cycle()
[all …]
/linux/Documentation/devicetree/bindings/pwm/
H A Dgoogle,cros-ec-pwm.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/pwm/google,cros-ec-pwm.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: PWM controlled by ChromeOS EC
10 - Thierry Reding <thierry.reding@gmail.com>
11 - '"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>'
14 Google's ChromeOS EC PWM is a simple PWM attached to the Embedded Controller
15 (EC) and controlled via a host-command interface.
16 An EC PWM node should be only found as a sub-node of the EC node (see
[all …]
/linux/Documentation/devicetree/bindings/leds/
H A Dleds-pwm-multicolor.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/leds-pwm-multicolor.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Multi-color LEDs connected to PWM
10 - Sven Schwermer <sven.schwermer@disruptive-technologies.com>
13 This driver combines several monochrome PWM LEDs into one multi-color
18 const: pwm-leds-multicolor
20 multi-led:
21 type: object
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/linux/arch/arm/boot/dts/samsung/
H A Dexynos5422-odroidhc1.dts1 // SPDX-License-Identifier: GPL-2.0
10 /dts-v1/;
11 #include <dt-bindings/leds/common.h>
12 #include "exynos5422-odroid-core.dtsi"
16 compatible = "hardkernel,odroid-hc1", "samsung,exynos5800", \
19 led-controller {
20 compatible = "pwm-leds";
22 led-1 {
25 pwms = <&pwm 2 2000000 0>;
26 pwm-names = "pwm2";
[all …]
/linux/Documentation/devicetree/bindings/sound/
H A Datmel,sama5d2-classd.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
4 ---
5 $id: http://devicetree.org/schemas/sound/atmel,sama5d2-classd.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Nicolas Ferre <nicolas.ferre@microchip.com>
12 - Alexandre Belloni <alexandre.belloni@bootlin.com>
13 - Claudiu Beznea <claudiu.beznea@microchip.com>
17 Modulated (PWM) output stereo Class D amplifier.
22 - items:
23 - const: atmel,sama5d2-classd
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/linux/arch/loongarch/boot/dts/
H A Dloongson-2k0500.dtsi1 // SPDX-License-Identifier: GPL-2.0
6 /dts-v1/;
8 #include <dt-bindings/interrupt-controller/irq.h>
9 #include <dt-bindings/clock/loongson,ls2k-clk.h>
12 #address-cells = <2>;
13 #size-cells = <2>;
16 #address-cells = <1>;
17 #size-cells = <0>;
27 ref_100m: clock-ref-100m {
28 compatible = "fixed-clock";
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/linux/arch/arm64/boot/dts/qcom/
H A Dpm8550.dtsi1 // SPDX-License-Identifier: BSD-3-Clause
6 #include <dt-bindings/interrupt-controller/irq.h>
7 #include <dt-bindings/spmi/spmi.h>
10 thermal-zones {
11 pm8550-thermal {
12 polling-delay-passive = <100>;
14 thermal-sensors = <&pm8550_temp_alarm>;
20 type = "passive";
26 type = "hot";
36 compatible = "qcom,pm8550", "qcom,spmi-pmic";
[all …]

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