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/Linux-v5.10/drivers/pwm/
Dpwm-jz4740.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
4 * JZ4740 platform PWM support
7 * - The .apply callback doesn't complete the currently running period before
15 #include <linux/mfd/ingenic-tcu.h>
20 #include <linux/pwm.h>
40 /* Enable all TCU channels for PWM use by default except channels 0/1 */ in jz4740_pwm_can_use_chn()
41 u32 pwm_channels_mask = GENMASK(jz->chip.npwm - 1, 2); in jz4740_pwm_can_use_chn()
43 device_property_read_u32(jz->chip.dev->parent, in jz4740_pwm_can_use_chn()
44 "ingenic,pwm-channels-mask", in jz4740_pwm_can_use_chn()
[all …]
Dpwm-omap-dmtimer.c1 // SPDX-License-Identifier: GPL-2.0-only
9 * Also based on pwm-samsung.c
13 * PWM driver / controller, using the OMAP's dual-mode timers
15 * reloaded with the load value and the pwm output goes up.
20 * - When PWM is stopped, timer counter gets stopped immediately. This
21 * doesn't allow the current PWM period to complete and stops abruptly.
22 * - When PWM is running and changing both duty cycle and period,
25 * is updated while the pwm pin is high, current pwm period/duty_cycle
27 * - period for current cycle = current_period + new period
28 * - duty_cycle for current period = current period + new duty_cycle.
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Dpwm-renesas-tpu.c1 // SPDX-License-Identifier: GPL-2.0
3 * R-Mobile TPU PWM driver
18 #include <linux/pwm.h>
63 TPU_PIN_PWM, /* Pin is driven by PWM */
64 TPU_PIN_ACTIVE, /* Pin is driven active */
92 static void tpu_pwm_write(struct tpu_pwm_device *pwm, int reg_nr, u16 value) in tpu_pwm_write() argument
94 void __iomem *base = pwm->tpu->base + TPU_CHANNEL_OFFSET in tpu_pwm_write()
95 + pwm->channel * TPU_CHANNEL_SIZE; in tpu_pwm_write()
100 static void tpu_pwm_set_pin(struct tpu_pwm_device *pwm, in tpu_pwm_set_pin() argument
101 enum tpu_pin_state state) in tpu_pwm_set_pin() argument
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Dpwm-stm32.c1 // SPDX-License-Identifier: GPL-2.0
7 * Inspired by timer-stm32.c from Maxime Coquelin
8 * pwm-atmel.c from Bo Shen
12 #include <linux/mfd/stm32-timers.h>
17 #include <linux/pwm.h>
31 struct mutex lock; /* protect pwm config/enable */
50 regmap_read(dev->regmap, TIM_CCER, &ccer); in active_channels()
59 return regmap_write(dev->regmap, TIM_CCR1, value); in write_ccrx()
61 return regmap_write(dev->regmap, TIM_CCR2, value); in write_ccrx()
63 return regmap_write(dev->regmap, TIM_CCR3, value); in write_ccrx()
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Dpwm-imx-tpm.c1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright 2018-2019 NXP.
6 * - The TPM counter and period counter are shared between
9 * - Changes to polarity cannot be latched at the time of the
11 * - Changing period and duty cycle together isn't atomic,
24 #include <linux/pwm.h>
49 * together as a 2-bit field here.
57 #define PWM_IMX_TPM_MOD_MOD GENMASK(PWM_IMX_TPM_MOD_WIDTH - 1, 0)
82 * This function determines for a given pwm_state *state that a consumer
90 const struct pwm_state *state) in pwm_imx_tpm_round_state() argument
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Dpwm-pca9685.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Driver for PCA9685 16-channel 12-bit PWM LED controller
8 * based on the pwm-twl-led.c driver
18 #include <linux/pwm.h>
27 * one channel affects the period of all 16 PWM outputs!
28 * However, the ratio between each configured duty cycle and the chip-wide
95 mutex_lock(&pca->lock); in pca9685_pwm_test_and_set_inuse()
101 if (!bitmap_empty(pca->pwms_inuse, PCA9685_MAXCHAN)) { in pca9685_pwm_test_and_set_inuse()
110 if (test_bit(PCA9685_MAXCHAN, pca->pwms_inuse)) { in pca9685_pwm_test_and_set_inuse()
115 is_inuse = test_and_set_bit(pwm_idx, pca->pwms_inuse); in pca9685_pwm_test_and_set_inuse()
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/Linux-v5.10/Documentation/devicetree/bindings/hwmon/
Dadt7475.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jean Delvare <jdelvare@suse.com>
23 https://www.onsemi.com/pub/Collateral/ADT7473-D.PDF
24 https://www.onsemi.com/pub/Collateral/ADT7475-D.PDF
25 https://www.onsemi.com/pub/Collateral/ADT7476-D.PDF
26 https://www.onsemi.com/pub/Collateral/ADT7490-D.PDF
34 - adi,adt7473
35 - adi,adt7475
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/Linux-v5.10/Documentation/driver-api/
Dpwm.rst2 Pulse Width Modulation (PWM) interface
5 This provides an overview about the Linux PWM interface
9 the Linux PWM API (although they could). However, PWMs are often
12 this kind of flexibility the generic PWM API exists.
15 ----------------
17 Users of the legacy PWM API use unique IDs to refer to PWM devices.
19 Instead of referring to a PWM device via its unique ID, board setup code
20 should instead register a static mapping that can be used to match PWM
24 PWM_LOOKUP("tegra-pwm", 0, "pwm-backlight", NULL,
36 ----------
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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/serial_core.c
22 .. kernel-doc:: drivers/tty/serial/8250/8250_core.c
25 Pulse-Width Modulation (PWM)
28 Pulse-width modulation is a modulation technique primarily used to
31 The PWM framework provides an abstraction for providers and consumers of
32 PWM signals. A controller that provides one or more PWM signals is
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/Linux-v5.10/Documentation/devicetree/bindings/pwm/
Dnvidia,tegra20-pwm.txt4 - compatible: Must be:
5 - "nvidia,tegra20-pwm": for Tegra20
6 - "nvidia,tegra30-pwm", "nvidia,tegra20-pwm": for Tegra30
7 - "nvidia,tegra114-pwm", "nvidia,tegra20-pwm": for Tegra114
8 - "nvidia,tegra124-pwm", "nvidia,tegra20-pwm": for Tegra124
9 - "nvidia,tegra132-pwm", "nvidia,tegra20-pwm": for Tegra132
10 - "nvidia,tegra210-pwm", "nvidia,tegra20-pwm": for Tegra210
11 - "nvidia,tegra186-pwm": for Tegra186
12 - "nvidia,tegra194-pwm": for Tegra194
13 - reg: physical base address and length of the controller's registers
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/Linux-v5.10/drivers/video/backlight/
Dpwm_bl.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Simple PWM based backlight control, board code has to setup
4 * 1) pin configuration so PWM waveforms can output
17 #include <linux/pwm.h>
23 struct pwm_device *pwm; member
44 struct pwm_state state; in pwm_backlight_power_on() local
47 pwm_get_state(pb->pwm, &state); in pwm_backlight_power_on()
48 if (pb->enabled) in pwm_backlight_power_on()
51 err = regulator_enable(pb->power_supply); in pwm_backlight_power_on()
53 dev_err(pb->dev, "failed to enable power supply\n"); in pwm_backlight_power_on()
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/Linux-v5.10/include/linux/
Dpwm.h1 /* SPDX-License-Identifier: GPL-2.0 */
15 * enum pwm_polarity - polarity of a PWM signal
16 * @PWM_POLARITY_NORMAL: a high signal for the duration of the duty-
19 * @PWM_POLARITY_INVERSED: a low signal for the duration of the duty-
29 * struct pwm_args - board-dependent PWM arguments
33 * This structure describes board-dependent arguments attached to a PWM
34 * device. These arguments are usually retrieved from the PWM lookup table or
37 * Do not confuse this with the PWM state: PWM arguments represent the initial
38 * configuration that users want to use on this PWM device rather than the
39 * current PWM hardware state.
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/Linux-v5.10/arch/arm/boot/dts/
Dsun5i-a13-pocketbook-touch-lux-3.dts1 // SPDX-License-Identifier: GPL-2.0 OR MIT
6 /dts-v1/;
7 #include "sun5i-a13.dtsi"
8 #include "sunxi-common-regulators.dtsi"
9 #include <dt-bindings/gpio/gpio.h>
10 #include <dt-bindings/input/input.h>
11 #include <dt-bindings/interrupt-controller/irq.h>
12 #include <dt-bindings/pwm/pwm.h>
16 compatible = "pocketbook,touch-lux-3", "allwinner,sun5i-a13";
26 compatible = "pwm-backlight";
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Dimx6qdl-nit6xlite.dtsi1 // SPDX-License-Identifier: GPL-2.0 OR X11
5 #include <dt-bindings/gpio/gpio.h>
6 #include <dt-bindings/input/input.h>
10 stdout-path = &uart2;
19 compatible = "simple-bus";
20 #address-cells = <1>;
21 #size-cells = <0>;
24 compatible = "regulator-fixed";
26 regulator-name = "2P5V";
27 regulator-min-microvolt = <2500000>;
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Dimx6q-kp.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
7 /dts-v1/;
11 #include <dt-bindings/gpio/gpio.h>
12 #include <dt-bindings/pwm/pwm.h>
13 #include <dt-bindings/sound/fsl-imx-audmux.h>
16 backlight_lcd: backlight-lcd {
17 compatible = "pwm-backlight";
19 brightness-levels = <0 255>;
20 num-interpolated-steps = <255>;
21 default-brightness-level = <250>;
[all …]
Dimx6qdl-nitrogen6_max.dtsi1 // SPDX-License-Identifier: GPL-2.0 OR X11
5 #include <dt-bindings/gpio/gpio.h>
6 #include <dt-bindings/input/input.h>
10 stdout-path = &uart2;
19 compatible = "simple-bus";
20 #address-cells = <1>;
21 #size-cells = <0>;
24 compatible = "regulator-fixed";
26 regulator-name = "1P8V";
27 regulator-min-microvolt = <1800000>;
[all …]
Dimx6ul-kontron-n6x1x-s.dtsi1 // SPDX-License-Identifier: GPL-2.0
8 #include <dt-bindings/gpio/gpio.h>
11 gpio-leds {
12 compatible = "gpio-leds";
13 pinctrl-names = "default";
14 pinctrl-0 = <&pinctrl_gpio_leds>;
17 label = "debug-led1";
19 default-state = "off";
20 linux,default-trigger = "heartbeat";
24 label = "debug-led2";
[all …]
Darmada-388-helios4.dts1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
10 /dts-v1/;
11 #include "armada-388.dtsi"
12 #include "armada-38x-solidrun-microsom.dtsi"
25 /* So that mvebu u-boot can update the MAC addresses */
30 stdout-path = "serial0:115200n8";
33 reg_12v: regulator-12v {
34 compatible = "regulator-fixed";
35 regulator-name = "power_brick_12V";
36 regulator-min-microvolt = <12000000>;
[all …]
Drk3229-xms6.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
3 /dts-v1/;
5 #include <dt-bindings/input/input.h>
17 dc_12v: dc-12v-regulator {
18 compatible = "regulator-fixed";
19 regulator-name = "dc_12v";
20 regulator-always-on;
21 regulator-boot-on;
22 regulator-min-microvolt = <12000000>;
23 regulator-max-microvolt = <12000000>;
[all …]
/Linux-v5.10/arch/arm64/boot/dts/rockchip/
Drk3399-khadas-edge.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
7 /dts-v1/;
8 #include <dt-bindings/input/linux-event-codes.h>
9 #include <dt-bindings/pwm/pwm.h>
11 #include "rk3399-opp.dtsi"
15 stdout-path = "serial2:1500000n8";
18 clkin_gmac: external-gmac-clock {
19 compatible = "fixed-clock";
20 clock-frequency = <125000000>;
21 clock-output-names = "clkin_gmac";
[all …]
Drk3399-roc-pc.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
3 * Copyright (c) 2017 T-Chip Intelligent Technology Co., Ltd
6 /dts-v1/;
7 #include <dt-bindings/input/linux-event-codes.h>
8 #include <dt-bindings/pwm/pwm.h>
10 #include "rk3399-opp.dtsi"
13 model = "Firefly ROC-RK3399-PC Board";
14 compatible = "firefly,roc-rk3399-pc", "rockchip,rk3399";
17 stdout-path = "serial2:1500000n8";
21 compatible = "pwm-backlight";
[all …]
Drk3399-rockpro64.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
7 #include <dt-bindings/input/linux-event-codes.h>
8 #include <dt-bindings/pwm/pwm.h>
10 #include "rk3399-opp.dtsi"
14 stdout-path = "serial2:1500000n8";
17 clkin_gmac: external-gmac-clock {
18 compatible = "fixed-clock";
19 clock-frequency = <125000000>;
20 clock-output-names = "clkin_gmac";
21 #clock-cells = <0>;
[all …]
Drk3399-evb.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
6 /dts-v1/;
7 #include <dt-bindings/pwm/pwm.h>
12 compatible = "rockchip,rk3399-evb", "rockchip,rk3399";
15 compatible = "pwm-backlight";
16 brightness-levels = <
49 default-brightness-level = <200>;
53 edp_panel: edp-panel {
54 compatible ="lg,lp079qx1-sp0v";
56 enable-gpios = <&gpio1 RK_PB5 GPIO_ACTIVE_HIGH>;
[all …]
Drk3399-sapphire.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
6 #include "dt-bindings/pwm/pwm.h"
7 #include "dt-bindings/input/input.h"
9 #include "rk3399-opp.dtsi"
12 compatible = "rockchip,rk3399-sapphire", "rockchip,rk3399";
15 stdout-path = "serial2:1500000n8";
18 clkin_gmac: external-gmac-clock {
19 compatible = "fixed-clock";
20 clock-frequency = <125000000>;
21 clock-output-names = "clkin_gmac";
[all …]
/Linux-v5.10/drivers/input/keyboard/
Dlm8323.c1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2007-2009 Nokia Corporation
36 #define LM8323_CMD_SET_ACTIVE 0x8b /* Set active time. */
45 #define LM8323_CMD_PWM_WRITE 0x95 /* Write PWM script. */
46 #define LM8323_CMD_START_PWM 0x96 /* Start PWM engine. */
47 #define LM8323_CMD_STOP_PWM 0x97 /* Stop PWM engine. */
87 /* Commands for PWM engine; feed in with PWM_WRITE. */
88 /* Load ramp counter from duty cycle field (range 0 - 0xff). */
126 /* pwm lock */
147 struct lm8323_pwm pwm[LM8323_NUM_PWMS]; member
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