| /linux/Documentation/devicetree/bindings/leds/ |
| H A D | leds-bcm6358.txt | 5 which can either be controlled by software (exporting the 74x164 as spi-gpio.
10 - compatible : should be "brcm,bcm6358-leds".
11 - #address-cells : must be 1.
12 - #size-cells : must be 0.
13 - reg : BCM6358 LED controller address and size.
16 - brcm,clk-div : SCK signal divider. Possible values are 1, 2, 4 and 8.
18 - brcm,clk-dat-low : Boolean, makes clock and data signals active low.
21 Each LED is represented as a sub-node of the brcm,bcm6358-leds device.
23 LED sub-node required properties:
24 - reg : LED pin number (only LEDs 0 to 31 are valid).
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| H A D | leds-bcm6328.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/leds/leds-bcm6328.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Álvaro Fernández Rojas <noltari@gmail.com>
17 as spi-gpio. See
21 exporting the 74x164 as spi-gpio prevents those LEDs to be hardware
29 explained later in brcm,link-signal-sources). Even if a LED is hardware
34 Each LED is represented as a sub-node of the brcm,bcm6328-leds device.
38 const: brcm,bcm6328-leds
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| /linux/Documentation/devicetree/bindings/power/supply/ |
| H A D | maxim,max8903.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/power/supply/maxim,max8903.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Sebastian Reichel <sre@kernel.org>
13 - $ref: power-supply.yaml#
19 dok-gpios:
21 description: Valid DC power has been detected (active low, input)
23 uok-gpios:
25 description: Valid USB power has been detected (active low, input)
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| /linux/Documentation/devicetree/bindings/display/panel/ |
| H A D | panel-common.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/display/panel/panel-common.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Thierry Reding <thierry.reding@gmail.com>
11 - Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
24 width-mm:
29 height-mm:
43 non-descriptive information. For instance an LCD panel in a system that
54 flip-horizontal:
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| /linux/Documentation/devicetree/bindings/usb/ |
| H A D | fsl,imx8mp-dwc3.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 ---
5 $id: http://devicetree.org/schemas/usb/fsl,imx8mp-dwc3.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Li Jun <jun.li@nxp.com>
16 - items:
17 - const: fsl,imx95-dwc3
18 - const: fsl,imx8mp-dwc3
19 - const: fsl,imx8mp-dwc3
23 - description: Address and length of the register set for HSIO Block Control
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| H A D | pxa-usb.txt | 6 - compatible: Should be "marvell,pxa-ohci" for USB controllers
10 - "marvell,enable-port1", "marvell,enable-port2", "marvell,enable-port3"
12 - "marvell,port-mode" selects the mode of the ports:
16 - "marvell,power-sense-low" - power sense pin is low-active.
17 - "marvell,power-control-low" - power control pin is low-active.
18 - "marvell,no-oc-protection" - disable over-current protection.
19 - "marvell,oc-mode-perport" - enable per-port over-current protection.
20 - "marvell,power_on_delay" Power On to Power Good time - in ms.
25 compatible = "marvell,pxa-ohci";
28 marvell,enable-port1;
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| /linux/drivers/gpu/drm/panfrost/ |
| H A D | panfrost_regs.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
6 * (C) COPYRIGHT 2010-2018 ARM Limited. All rights reserved.
59 #define GPU_PWR_KEY 0x50 /* (WO) Power manager key register */
61 #define GPU_PWR_OVERRIDE0 0x54 /* (RW) Power manager override settings */
62 #define GPU_PWR_OVERRIDE1 0x58 /* (RW) Power manager override settings */
97 #define GPU_SHADER_PRESENT_LO 0x100 /* (RO) Shader core present bitmap, low word */
99 #define GPU_TILER_PRESENT_LO 0x110 /* (RO) Tiler core present bitmap, low word */
102 #define GPU_L2_PRESENT_LO 0x120 /* (RO) Level 2 cache present bitmap, low word */
109 #define GPU_STACK_PRESENT_LO 0xE00 /* (RO) Core stack present bitmap, low word */
112 #define SHADER_READY_LO 0x140 /* (RO) Shader core ready bitmap, low word */
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| /linux/Documentation/driver-api/gpio/ |
| H A D | intro.rst | 17 A "General Purpose Input/Output" (GPIO) is a flexible software-controlled
25 System-on-Chip (SOC) processors heavily rely on GPIOs. In some cases, every
26 non-dedicated pin can be configured as a GPIO; and most chips have at least
28 provide GPIOs; multifunction chips like power managers, and audio codecs
31 Most PC southbridges have a few dozen GPIO-capable pins (with only the BIOS
36 - Output values are writable (high=1, low=0). Some chips also have
38 value might be driven, supporting "wire-OR" and similar schemes for the
41 - Input values are likewise readable (1, 0). Some chips support readback
42 of pins configured as "output", which is very useful in such "wire-OR"
44 input de-glitch/debounce logic, sometimes with software controls.
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| H A D | board.rst | 14 -----------
20 <function>-gpios, where <function> is the function the driver will request
26 led-gpios = <&gpio 15 GPIO_ACTIVE_HIGH>, /* red */
30 power-gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
33 Properties named <function>-gpio are also considered valid and old bindings use
38 "led" function, and GPIO 1 as the "power" GPIO::
40 struct gpio_desc *red, *green, *blue, *power;
46 power = gpiod_get(dev, "power", GPIOD_OUT_HIGH);
48 The led GPIOs will be active high, while the power GPIO will be active low (i.e.
49 gpiod_is_active_low(power) will be true).
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| /linux/Documentation/admin-guide/pm/ |
| H A D | strategies.rst | 1 .. SPDX-License-Identifier: GPL-2.0
5 Power Management Strategies
13 The Linux kernel supports two major high-level power management strategies.
15 One of them is based on using global low-power states of the whole system in
17 significantly reduced, referred to as :doc:`sleep states <sleep-states>`. The
23 :doc:`system-wide power management <system-wide>`.
25 The other strategy, referred to as the :doc:`working-state power management
26 <working-state>`, is based on adjusting the power states of individual hardware
30 a metastate covering a range of different power states of the system in which
31 the individual components of it can be either ``active`` (in use) or
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| /linux/drivers/regulator/ |
| H A D | mcp16502.c | 1 // SPDX-License-Identifier: GPL-2.0
9 // Inspired from tps65086-regulator.c
29 * The PMIC has four sets of registers corresponding to four power modes:
30 * Performance, Active, Low-power, Hibernate.
33 * Each regulator has a register for each power mode. To access a register
41 * a low-power state while the PMIC is in Active mode. They are supposed to be
42 * configured at startup and then simply transition to/from a global low-power
43 * state by setting the GPIO lpm pin high/low.
45 * This driver keeps the PMIC in Active mode, Low-power state is set for the
48 * The PMIC's Low-power and Hibernate modes are used during standby/suspend.
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| /linux/Documentation/devicetree/bindings/net/ |
| H A D | sff,sfp.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Small Form Factor (SFF) Committee Small Form-factor Pluggable (SFP)
11 - Russell King <linux@armlinux.org.uk>
16 - sff,sfp # for SFP modules
17 - sff,sff # for soldered down SFF modules
19 i2c-bus:
24 maximum-power-milliwatt:
28 Maximum module power consumption Specifies the maximum power consumption
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| /linux/include/soc/at91/ |
| H A D | at91sam9_ddrsdr.h | 1 /* SPDX-License-Identifier: GPL-2.0-or-later */
46 #define AT91_DDRSDRC_OCD (1 << 12) /* Off-Chip Driver [SAM9 Only] */
48 #define AT91_DDRSDRC_ACTBST (1 << 18) /* Active Bank X to Burst Stop Read Access Bank Y [SAM9 Onl…
51 #define AT91_DDRSDRC_TRAS (0xf << 0) /* Active to Precharge delay */
56 #define AT91_DDRSDRC_TRRD (0xf << 20) /* Active BankA to BankB */
59 #define AT91_DDRSDRC_TMRD (0xf << 28) /* Load mode to active/refresh delay */
63 #define AT91_DDRSDRC_TXSNR (0xff << 8) /* Exit self-refresh to non-read */
64 #define AT91_DDRSDRC_TXSRD (0xff << 16) /* Exit self-refresh to read */
65 #define AT91_DDRSDRC_TXP (0xf << 24) /* Exit power-down delay */
68 #define AT91_DDRSDRC_TXARD (0xf << 0) /* Exit active power down delay to read command in mode "F…
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| /linux/arch/arm/boot/dts/marvell/ |
| H A D | dove-sbc-a510.dts | 2 * Device Tree file for Compulab SBC-A510 Single Board Computer
6 * This file is dual-licensed: you can use it either under the terms
46 * SBC-A510 comprises a PCA9555 I2C GPIO expander its GPIO lines connected to
48 * 0.0 USB0 VBUS_EN (active high)
51 * 0.3 DVI transmitter TI TFP410 PD# (active low power down)
52 * 0.4 LVDS transmitter DS90C365 PD# (active low power down)
53 * 0.5 LCD nRST (active low reset)
54 * 0.6 PCIe0 nRST (active low reset)
55 * 0.7 mini-PCIe slot W_DISABLE#
60 * 1.3 MMC VCC_EN (active high) and P21.7
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| /linux/Documentation/devicetree/bindings/mfd/ |
| H A D | max77620.txt | 1 MAX77620 Power management IC from Maxim Semiconductor.
4 -------------------
5 - compatible: Must be one of
9 - reg: I2C device address.
12 -------------------
13 - interrupts: The interrupt on the parent the controller is
15 - interrupt-controller: Marks the device node as an interrupt controller.
16 - #interrupt-cells: is <2> and their usage is compliant to the 2 cells
17 variant of <../interrupt-controller/interrupts.txt>
19 are defined at dt-bindings/mfd/max77620.h.
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| /linux/Documentation/driver-api/pm/ |
| H A D | devices.rst | 1 .. SPDX-License-Identifier: GPL-2.0
7 Device Power Management Basics
10 :Copyright: |copy| 2010-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
17 Most of the code in Linux is device drivers, so most of the Linux power
18 management (PM) code is also driver-specific. Most drivers will do very
22 This writeup gives an overview of how drivers interact with system-wide
23 power management goals, emphasizing the models and interfaces that are
25 background for the domain-specific work you'd do with any specific driver.
28 Two Models for Device Power Management
31 Drivers will use one or both of these models to put devices into low-power
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| /linux/Documentation/driver-api/ |
| H A D | slimbus.rst | 9 ----------------
10 SLIMbus (Serial Low Power Interchip Media Bus) is a specification developed by
12 configuration, and is a 2-wire multi-drop implementation (clock, and data).
15 (System-on-Chip) and peripheral components (typically codec). SLIMbus uses
16 Time-Division-Multiplexing to accommodate multiple data channels, and
24 A data channel is used for data-transfer between 2 SLIMbus devices. Data
28 ---------------------
32 channel allocation. Every bus has 1 active manager.
36 Framer device is responsible for clocking the bus, and transmitting frame-sync
49 responsible to select the active-framer for clocking the bus.
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| /linux/arch/mips/boot/dts/brcm/ |
| H A D | bcm63268-comtrend-vr-3032u.dts | 1 // SPDX-License-Identifier: GPL-2.0
2 /dts-v1/;
7 compatible = "comtrend,vr-3032u", "brcm,bcm63268";
8 model = "Comtrend VR-3032u";
17 stdout-path = &uart0;
23 brcm,serial-leds;
24 brcm,serial-dat-low;
25 brcm,serial-shift-inv;
29 brcm,hardware-controlled;
30 brcm,link-signal-sources = <0>;
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| /linux/arch/arm64/boot/dts/freescale/ |
| H A D | imx93-tqma9352-mba91xxca.dts | 1 // SPDX-License-Identifier: (GPL-2.0-or-later OR MIT)
3 * Copyright (c) 2022-2025 TQ-Systems GmbH <linux@ew.tq-group.com>,
4 * D-82229 Seefeld, Germany.
8 /dts-v1/;
10 #include <dt-bindings/input/input.h>
11 #include <dt-bindings/leds/common.h>
12 #include <dt-bindings/net/ti-dp83867.h>
13 #include <dt-bindings/pwm/pwm.h>
14 #include <dt-bindings/usb/pd.h>
15 #include "imx93-tqma9352.dtsi"
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|
| H A D | imx93-tqma9352-mba93xxca.dts | 1 // SPDX-License-Identifier: (GPL-2.0-or-later OR MIT)
3 * Copyright (c) 2022-2024 TQ-Systems GmbH <linux@ew.tq-group.com>,
4 * D-82229 Seefeld, Germany.
8 /dts-v1/;
10 #include <dt-bindings/input/input.h>
11 #include <dt-bindings/leds/common.h>
12 #include <dt-bindings/net/ti-dp83867.h>
13 #include <dt-bindings/pwm/pwm.h>
15 #include "imx93-tqma9352.dtsi"
18 model = "TQ-Systems i.MX93 TQMa93xxLA/TQMa93xxCA on MBa93xxCA starter kit";
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| /linux/Documentation/devicetree/bindings/hwmon/ |
| H A D | adi,max31827.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Analog Devices MAX31827, MAX31828, MAX31829 Low-Power Temperature Switch
10 - Daniel Matyas <daniel.matyas@analog.com>
13 Analog Devices MAX31827, MAX31828, MAX31829 Low-Power Temperature Switch with
15 https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31827-MAX31829.pdf
20 - const: adi,max31827
21 - items:
22 - enum:
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| /linux/Documentation/devicetree/bindings/leds/irled/ |
| H A D | ir-spi-led.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/leds/irled/ir-spi-led.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Sean Young <sean@mess.org>
17 - $ref: /schemas/spi/spi-peripheral-props.yaml#
21 const: ir-spi-led
26 duty-cycle:
30 Percentage of one period in which the signal is active.
32 led-active-low:
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| /linux/Documentation/devicetree/bindings/input/touchscreen/ |
| H A D | cypress,cy8ctma340.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
14 - Javier Martinez Canillas <javier@dowhile0.org>
15 - Linus Walleij <linus.walleij@linaro.org>
18 - $ref: touchscreen.yaml#
26 - const: cypress,cy8ctma340
27 - const: cypress,cy8ctst341
28 - const: cypress,cyttsp-spi
31 - const: cypress,cyttsp-i2c
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| /linux/Documentation/devicetree/bindings/display/bridge/ |
| H A D | ps8640.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Nicolas Boichat <drinkcat@chromium.org>
13 The PS8640 is a low power MIPI-to-eDP video format converter supporting
28 powerdown-gpios:
30 description: GPIO connected to active low powerdown.
32 reset-gpios:
34 description: GPIO connected to active low reset.
36 vdd12-supply:
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| /linux/drivers/power/supply/ |
| H A D | max8903_charger.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
28 struct gpio_desc *dok; /* DC (Adapter) Power OK output */
29 struct gpio_desc *uok; /* USB Power OK output */
32 struct gpio_desc *dcm; /* Current-Limit Mode input (1: DC, 2: USB) */
41 POWER_SUPPLY_PROP_ONLINE, /* External power source */
53 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; in max8903_get_property()
54 if (data->chg) { in max8903_get_property()
55 if (gpiod_get_value(data->chg)) in max8903_get_property()
57 val->intval = POWER_SUPPLY_STATUS_CHARGING; in max8903_get_property()
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