| /linux-6.12.1/Documentation/devicetree/bindings/leds/backlight/ |
| D | pwm-backlight.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/pwm-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: pwm-backlight
10 - Lee Jones <lee@kernel.org>
11 - Daniel Thompson <daniel.thompson@linaro.org>
12 - Jingoo Han <jingoohan1@gmail.com>
15 - $ref: common.yaml#
19 const: pwm-backlight
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| D | mediatek,mt6370-backlight.yaml | 1 # 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#
7 title: MediaTek MT6370 Backlight
10 - ChiaEn Wu <chiaen_wu@richtek.com>
14 The MT6370 Backlight WLED driver supports up to a 29V output voltage for
21 - $ref: common.yaml#
26 - mediatek,mt6370-backlight
27 - mediatek,mt6372-backlight
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| D | lp855x-backlight.yaml | 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/lp855x-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Texas Instruments LP855X backlight controllers
10 - Artur Weber <aweber.kernel@gmail.com>
15 - ti,lp8550
16 - ti,lp8551
17 - ti,lp8552
18 - ti,lp8553
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| D | sky81452-backlight.txt | 1 SKY81452-backlight bindings
4 - compatible : Must be "skyworks,sky81452-backlight"
7 - name : Name of backlight device. Default is 'lcd-backlight'.
8 - gpios : GPIO to use to EN pin.
10 - led-sources : List of enabled channels from 0 to 5.
12 - skyworks,ignore-pwm : Ignore both PWM input
13 - skyworks,dpwm-mode : Enable DPWM dimming mode, otherwise Analog dimming.
14 - skyworks,phase-shift : Enable phase shift mode
15 - skyworks,short-detection-threshold-volt
17 - skyworks,current-limit-mA
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| D | 88pm860x.txt | 1 88pm860x-backlight bindings
4 - marvell,88pm860x-iset: Current supplies on backlight device.
5 - marvell,88pm860x-pwm: PWM frequency on backlight device.
10 backlight-0 {
11 marvell,88pm860x-iset = <4>;
12 marvell,88pm860x-pwm = <3>;
14 backlight-2 {
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| D | mps,mp3309c.yaml | 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/mps,mp3309c.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: MPS MP3309C backlight
10 - Flavio Suligoi <f.suligoi@asem.it>
13 The Monolithic Power (MPS) MP3309C is a WLED step-up converter, featuring a
17 - analog mode, via I2C commands, as default mode (32 dimming levels)
18 - PWM controlled mode (optional)
24 - $ref: common.yaml#
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| D | richtek,rt4831-backlight.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/richtek,rt4831-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Richtek RT4831 Backlight
10 - ChiYuan Huang <cy_huang@richtek.com>
14 and LCD backlight.
16 For the LCD backlight, it can provide four channel WLED driving capability.
20 https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf
23 - $ref: common.yaml#
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| /linux-6.12.1/Documentation/devicetree/bindings/pwm/ |
| D | pwm.txt | 1 Specifying PWM information for devices
4 1) PWM user nodes
5 -----------------
7 PWM users should specify a list of PWM devices that they want to use
8 with a property containing a 'pwm-list':
10 pwm-list ::= <single-pwm> [pwm-list]
11 single-pwm ::= <pwm-phandle> <pwm-specifier>
12 pwm-phandle : phandle to PWM controller node
13 pwm-specifier : array of #pwm-cells specifying the given PWM
16 PWM properties should be named "pwms". The exact meaning of each pwms
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| D | pwm-lp3943.txt | 1 TI/National Semiconductor LP3943 PWM controller
4 - compatible: "ti,lp3943-pwm"
5 - #pwm-cells: Should be 2. See pwm.yaml in this directory for a
9 - ti,pwm0 or ti,pwm1: Output pin number(s) for PWM channel 0 or 1.
17 PWM 0 is for RGB LED brightness control
18 PWM 1 is for brightness control of LP8557 backlight device
26 * PWM 0 : output 8, 9 and 10
27 * PWM 1 : output 15
29 pwm3943: pwm {
30 compatible = "ti,lp3943-pwm";
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| D | atmel,hlcdc-pwm.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/pwm/atmel,hlcdc-pwm.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Atmel's HLCDC's PWM controller
10 - Nicolas Ferre <nicolas.ferre@microchip.com>
11 - Alexandre Belloni <alexandre.belloni@bootlin.com>
12 - Claudiu Beznea <claudiu.beznea@tuxon.dev>
15 The LCDC integrates a Pulse Width Modulation (PWM) Controller. This block
17 display's contrast by software. LCDC_PWM is an 8-bit PWM signal that can be
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| /linux-6.12.1/Documentation/ABI/testing/ |
| D | sysfs-class-backlight-driver-lm3533 | 1 What: /sys/class/backlight/<backlight>/als_channel
7 ALS-current-control mode (0, 1), where:
10 0 out_current0 (backlight 0)
11 1 out_current1 (backlight 1)
14 What: /sys/class/backlight/<backlight>/als_en
19 Enable ALS-current-control mode (0, 1).
21 What: /sys/class/backlight/<backlight>/id
26 Get the id of this backlight (0, 1).
28 What: /sys/class/backlight/<backlight>/linear
33 Set the brightness-mapping mode (0, 1), where:
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| /linux-6.12.1/drivers/gpu/drm/i915/display/ |
| D | intel_backlight.c | 1 // SPDX-License-Identifier: MIT
6 #include <linux/backlight.h>
8 #include <linux/pwm.h>
27 * scale - scale values from one range to another
50 target_val = mul_u32_u32(source_val - source_min, in scale()
51 target_max - target_min); in scale()
52 target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min); in scale()
65 struct intel_panel *panel = &connector->panel; in clamp_user_to_hw()
68 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max); in clamp_user_to_hw()
69 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max); in clamp_user_to_hw()
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| /linux-6.12.1/drivers/video/backlight/ |
| D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0-only
3 # Backlight & LCD drivers configuration
6 menu "Backlight & LCD device support"
14 This framework adds support for low-level control of LCD.
15 Some framebuffer devices connect to platform-specific LCD modules
16 in order to have a platform-specific way to control the flat panel
17 (contrast and applying power to the LCD (not to the backlight!)).
90 This driver provides a platform-device registered LCD power
118 tristate "Himax HX-8357 LCD Driver"
121 If you have a HX-8357 LCD panel, say Y to enable its LCD control
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| D | pwm_bl.c | 1 // 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
14 #include <linux/backlight.h>
16 #include <linux/pwm.h>
22 struct pwm_device *pwm; member
43 if (pb->enabled) in pwm_backlight_power_on()
46 if (pb->power_supply) { in pwm_backlight_power_on()
47 err = regulator_enable(pb->power_supply); in pwm_backlight_power_on()
49 dev_err(pb->dev, "failed to enable power supply\n"); in pwm_backlight_power_on()
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| D | 88pm860x_bl.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * Backlight driver for Marvell Semiconductor 88PM8606
16 #include <linux/backlight.h>
30 int pwm; member
40 int ret = -EINVAL; in backlight_power_set()
62 struct pm860x_chip *chip = data->chip; in pm860x_backlight_set()
72 backlight_power_set(chip, data->port, 1); in pm860x_backlight_set()
74 ret = pm860x_reg_write(data->i2c, data->reg_duty_cycle, value); in pm860x_backlight_set()
78 if ((data->current_brightness == 0) && brightness) { in pm860x_backlight_set()
79 if (data->iset) { in pm860x_backlight_set()
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| D | pandora_bl.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * Backlight driver for Pandora handheld.
4 * Pandora uses TWL4030 PWM0 -> TPS61161 combo for control backlight.
14 #include <linux/backlight.h>
32 #define MAX_USER_VALUE (MAX_VALUE - MIN_VALUE)
41 int brightness = bl->props.brightness; in pandora_backlight_update_status()
45 if (bl->props.power != BACKLIGHT_POWER_ON) in pandora_backlight_update_status()
47 if (bl->props.state & BL_CORE_FBBLANK) in pandora_backlight_update_status()
49 if (bl->props.state & BL_CORE_SUSPENDED) in pandora_backlight_update_status()
56 if (priv->old_state == PANDORABL_WAS_OFF) in pandora_backlight_update_status()
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| /linux-6.12.1/include/linux/platform_data/ |
| D | lp855x.h | 1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * LP855x Backlight Driver
15 /* Enable backlight. Only valid when BRT_MODE=10(I2C only) */
22 /* DEVICE CONTROL register - LP8550 */
27 /* DEVICE CONTROL register - LP8551 */
31 /* DEVICE CONTROL register - LP8552 */
35 /* DEVICE CONTROL register - LP8553 */
39 /* CONFIG register - LP8555 */
43 when the backlight turns on */
50 /* DEVICE CONTROL register - LP8556 */
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| /linux-6.12.1/Documentation/driver-api/backlight/ |
| D | lp855x-driver.rst | 5 Backlight driver for LP855x ICs
15 -----------
19 Brightness can be controlled by the pwm input or the i2c command.
26 Backlight control mode.
28 Value: pwm based or register based
37 ------------------------
42 Backlight driver name. If it is not defined, default name is set.
46 Initial value of backlight brightness.
48 Platform specific PWM period value. unit is nano.
49 Only valid when brightness is pwm input mode.
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| /linux-6.12.1/Documentation/devicetree/bindings/mfd/ |
| D | netronix,ntxec.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jonathan Neuschäfer <j.neuschaefer@gmx.net>
13 This EC is found in e-book readers of multiple brands (e.g. Kobo, Tolino), and
22 - description: The I2C address of the EC
24 system-power-controller:
26 description: See Documentation/devicetree/bindings/power/power-controller.txt
33 "#pwm-cells":
36 Number of cells in a PWM specifier.
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| D | sky81452.txt | 4 - compatible : Must be "skyworks,sky81452"
5 - reg : I2C slave address
8 - backlight : container node for backlight following the binding
9 in leds/backlight/sky81452-backlight.txt
10 - regulator : container node for regulators following the binding
11 in regulator/sky81452-regulator.txt
19 backlight {
20 compatible = "skyworks,sky81452-backlight";
21 name = "pwm-backlight";
22 led-sources = <0 1 2 3 6>;
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| D | ti-lmu.txt | 6 ------ ---------------------------------
7 LM3631 Backlight and regulator
8 LM3632 Backlight and regulator
9 LM3633 Backlight, LED and fault monitor
10 LM3695 Backlight
11 LM36274 Backlight and regulator
14 - compatible: Should be one of:
20 - reg: I2C slave address.
28 - enable-gpios: A GPIO specifier for hardware enable pin.
29 - ramp-up-us: Current ramping from one brightness level to
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| /linux-6.12.1/arch/arm/boot/dts/rockchip/ |
| D | rk3288-veyron-edp.dtsi | 1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
9 backlight_regulator: backlight-regulator {
10 compatible = "regulator-fixed";
11 enable-active-high;
13 pinctrl-names = "default";
14 pinctrl-0 = <&bl_pwr_en>;
15 regulator-name = "backlight_regulator";
16 vin-supply = <&vcc33_sys>;
17 startup-delay-us = <15000>;
20 panel_regulator: panel-regulator {
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| /linux-6.12.1/arch/arm/boot/dts/allwinner/ |
| D | sun4i-a10-topwise-a721.dts | 1 // SPDX-License-Identifier: GPL-2.0+
6 /dts-v1/;
7 #include "sun4i-a10.dtsi"
8 #include "sunxi-common-regulators.dtsi"
10 #include <dt-bindings/gpio/gpio.h>
11 #include <dt-bindings/input/input.h>
12 #include <dt-bindings/interrupt-controller/irq.h>
13 #include <dt-bindings/pwm/pwm.h>
17 compatible = "topwise,a721", "allwinner,sun4i-a10";
23 backlight: backlight { label
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| /linux-6.12.1/arch/arm/boot/dts/nvidia/ |
| D | tegra20-medcom-wide.dts | 1 // SPDX-License-Identifier: GPL-2.0
2 /dts-v1/;
4 #include "tegra20-tamonten.dtsi"
7 model = "Avionic Design Medcom-Wide board";
8 compatible = "ad,medcom-wide", "ad,tamonten", "nvidia,tegra20";
15 stdout-path = "serial0:115200n8";
27 pwm@7000a000 {
35 interrupt-parent = <&gpio>;
38 gpio-controller;
39 #gpio-cells = <2>;
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| /linux-6.12.1/arch/arm/boot/dts/st/ |
| D | stm32mp157c-lxa-mc1.dts | 1 /* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause) */
3 * Copyright (C) 2020 STMicroelectronics - All Rights Reserved
7 /dts-v1/;
10 #include "stm32mp15xx-osd32.dtsi"
11 #include "stm32mp15xxac-pinctrl.dtsi"
13 #include <dt-bindings/gpio/gpio.h>
14 #include <dt-bindings/pwm/pwm.h>
17 model = "Linux Automation MC-1 board";
18 compatible = "lxa,stm32mp157c-mc1", "oct,stm32mp15xx-osd32", "st,stm32mp157";
27 backlight: backlight { label
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