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/linux-6.12.1/Documentation/devicetree/bindings/arm/bcm/
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-6.12.1/drivers/hwmon/
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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Dpwm-fan.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * pwm-fan.c - Hwmon driver for fans connected to PWM lines.
17 #include <linux/pwm.h>
42 struct pwm_device *pwm; member
70 atomic_inc(&tach->pulses); in pulse_handler()
78 unsigned int delta = ktime_ms_delta(ktime_get(), ctx->sample_start); in sample_timer()
82 for (i = 0; i < ctx->tach_count; i++) { in sample_timer()
83 struct pwm_fan_tach *tach = &ctx->tachs[i]; in sample_timer()
86 pulses = atomic_read(&tach->pulses); in sample_timer()
87 atomic_sub(pulses, &tach->pulses); in sample_timer()
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Demc2305.c1 // SPDX-License-Identifier: GPL-2.0+
59 * struct emc2305_cdev_data - device-specific cooling device state
70 * Fan low limit feature is supported through 'hwmon' interface: 'hwmon' 'pwm' attribute is
73 * subsystem to select a lower duty cycle than the duty cycle selected with the 'pwm'
75 * From other side, fan speed is to be updated in hardware through 'pwm' only in case the
77 * speed will be just stored with no PWM update.
87 * struct emc2305_data - device-specific data
91 * @pwm_num: number of PWM channels
92 * @pwm_separate: separate PWM settings for every channel
93 * @pwm_min: array of minimum PWM per channel
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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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Df71882fg.c1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Copyright (C) 2007-2011 Hans de Goede <hdegoede@redhat.com> *
16 #include <linux/hwmon-sysfs.h>
26 #define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */
27 #define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */
94 #define F71882FG_REG_POINT_PWM(pwm, point) (0xAA + (point) + (16 * (pwm))) argument
95 #define F71882FG_REG_POINT_TEMP(pwm, point) (0xA6 + (point) + (16 * (pwm))) argument
186 [f71808a] = 2, /* +1 fan which is monitor + simple pwm only */
241 enum chips type; member
246 enum chips type; member
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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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/linux-6.12.1/Documentation/devicetree/bindings/mfd/
Dst,stm32-lptimer.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/mfd/st,stm32-lptimer.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: STMicroelectronics STM32 Low-Power Timers
10 The STM32 Low-Power Timer (LPTIM) is a 16-bit timer that provides several
12 - PWM output (with programmable prescaler, configurable polarity)
13 - Trigger source for STM32 ADC/DAC (LPTIM_OUT)
14 - Several counter modes:
15 - quadrature encoder to detect angular position and direction of rotary
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Dst,stm32-timers.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/mfd/st,stm32-timers.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 This hardware block provides 3 types of timer along with PWM functionality:
11 - advanced-control timers consist of a 16-bit auto-reload counter driven
12 by a programmable prescaler, break input feature, PWM outputs and
13 complementary PWM outputs channels.
14 - general-purpose timers consist of a 16-bit or 32-bit auto-reload counter
15 driven by a programmable prescaler and PWM outputs.
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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
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/linux-6.12.1/drivers/pwm/
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-6.12.1/Documentation/devicetree/bindings/leds/backlight/
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-6.12.1/Documentation/hwmon/
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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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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/linux-6.12.1/Documentation/devicetree/bindings/timer/
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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/linux-6.12.1/drivers/leds/
Dleds-pca9532.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * pca9532.c - 16-bit Led dimmer
18 #include <linux/leds-pca9532.h>
54 u8 pwm[2]; member
108 .name = "leds-pca953x",
116 /* We have two pwm/blinkers, but 16 possible leds to drive. Additionally,
117 * the clever Thecus people are using one pwm to drive the beeper. So,
118 * as a compromise we average one pwm to the values requested by all
121 static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink, in pca9532_calcpwm() argument
126 for (i = 0; i < data->chip_info->num_leds; i++) { in pca9532_calcpwm()
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/linux-6.12.1/Documentation/driver-api/
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-6.12.1/Documentation/devicetree/bindings/input/
Ddlg,da7280.txt4 - compatible: Should be "dlg,da7280".
5 - reg: Specifies the I2C slave address.
7 - interrupt-parent : Specifies the phandle of the interrupt controller to
10 - dlg,actuator-type: Set Actuator type. it should be one of:
11 "LRA" - Linear Resonance Actuator type.
12 "ERM-bar" - Bar type Eccentric Rotating Mass.
13 "ERM-coin" - Coin type Eccentric Rotating Mass.
15 - dlg,const-op-mode: Haptic operation mode for FF_CONSTANT.
17 1 - Direct register override(DRO) mode triggered by i2c(default),
18 2 - PWM data source mode controlled by PWM duty,
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/linux-6.12.1/Documentation/devicetree/bindings/leds/
Dleds-qcom-lpg.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/leds-qcom-lpg.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Bjorn Andersson <bjorn.andersson@linaro.org>
20 - enum:
21 - qcom,pm660l-lpg
22 - qcom,pm8150b-lpg
23 - qcom,pm8150l-lpg
24 - qcom,pm8350c-pwm
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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-6.12.1/Documentation/devicetree/bindings/pwm/
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
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/linux-6.12.1/drivers/input/misc/
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 …]
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-6.12.1/arch/arm/boot/dts/samsung/
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";
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/linux-6.12.1/Documentation/devicetree/bindings/soc/microchip/
Datmel,at91rm9200-tcb.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/soc/microchip/atmel,at91rm9200-tcb.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Alexandre Belloni <alexandre.belloni@bootlin.com>
19 - enum:
20 - atmel,at91rm9200-tcb
21 - atmel,at91sam9x5-tcb
22 - atmel,sama5d2-tcb
23 - const: simple-mfd
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