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/linux/Documentation/devicetree/bindings/leds/
H A Dleds-bcm6358.txt5 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).
[all …]
H A Dleds-bcm6328.yaml1 # 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
[all …]
/linux/Documentation/devicetree/bindings/power/supply/
H A Dmaxim,max8903.yaml1 # 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)
[all …]
/linux/Documentation/driver-api/gpio/
H A Dintro.rst17 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.
[all …]
H A Dboard.rst14 -----------
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).
[all …]
/linux/Documentation/devicetree/bindings/usb/
H A Dpxa-usb.txt6 - 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;
[all …]
/linux/drivers/regulator/
H A Dmcp16502.c1 // 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.
[all …]
/linux/Documentation/admin-guide/pm/
H A Dstrategies.rst1 .. 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
[all …]
/linux/include/soc/at91/
H A Dat91sam9_ddrsdr.h1 /* 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…
[all …]
/linux/arch/arm/boot/dts/marvell/
H A Ddove-sbc-a510.dts2 * 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
[all …]
/linux/Documentation/driver-api/pm/
H A Ddevices.rst1 .. 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
[all …]
/linux/Documentation/devicetree/bindings/mfd/
H A Dmax77620.txt1 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.
[all …]
/linux/Documentation/driver-api/
H A Dslimbus.rst9 ----------------
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.
[all …]
/linux/Documentation/power/
H A Druntime_pm.rst2 Runtime Power Management Framework for I/O Devices
5 (C) 2009-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
14 Support for runtime power management (runtime PM) of I/O devices is provided
15 at the power management core (PM core) level by means of:
17 * The power management workqueue pm_wq in which bus types and device drivers can
18 put their PM-related work items. It is strongly recommended that pm_wq be
20 them to be synchronized with system-wide power transitions (suspend to RAM,
22 include/linux/pm_runtime.h and defined in kernel/power/main.c.
24 * A number of runtime PM fields in the 'power' member of 'struct device' (which
31 * A set of helper functions defined in drivers/base/power/runtime.c that can be
[all …]
/linux/Documentation/devicetree/bindings/hwmon/
H A Dadi,max31827.yaml1 # 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:
[all …]
/linux/arch/mips/boot/dts/brcm/
H A Dbcm63268-comtrend-vr-3032u.dts1 // 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>;
[all …]
/linux/drivers/power/supply/
H A Dmax8903_charger.c1 // 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()
[all …]
/linux/Documentation/devicetree/bindings/input/touchscreen/
H A Dcypress,cy8ctma340.yaml1 # 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
[all …]
/linux/Documentation/devicetree/bindings/leds/irled/
H A Dir-spi-led.yaml1 # 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:
[all …]
/linux/arch/arm/boot/dts/intel/pxa/
H A Dpxa300-raumfeld-controller.dts1 // SPDX-License-Identifier: GPL-2.0
3 /dts-v1/;
5 #include "pxa300-raumfeld-common.dtsi"
9 compatible = "raumfeld,raumfeld-controller-pxa303", "marvell,pxa300";
11 reg_vbatt: regulator-vbatt {
12 compatible = "regulator-fixed";
13 regulator-name = "vbatt-fixed-supply";
14 regulator-min-microvolt = <3700000>;
15 regulator-max-microvolt = <3700000>;
16 regulator-always-on;
[all …]
/linux/Documentation/devicetree/bindings/display/bridge/
H A Dps8640.yaml1 # 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:
[all …]
/linux/include/linux/
H A Dlcd.h1 /* SPDX-License-Identifier: GPL-2.0 */
5 * Copyright (C) 2003,2004 Hewlett-Packard Company
23 * lcd_device->ops_lock is an internal backlight lock protecting the ops
39 /* The maximum value for contrast (read-only) */
44 /* Get the LCD panel power status (0: full on, 1..3: controller
45 power on, flat panel power off, 4: full off), see FB_BLANK_XXX */
47 /* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */
48 int (*set_power)(struct lcd_device *, int power);
49 /* Get the current contrast setting (0-max_contrast) */
92 lcd power off and 1, lcd power on. */
[all …]
/linux/arch/arm/mach-sa1100/include/mach/
H A Dh3xxx.h1 /* SPDX-License-Identifier: GPL-2.0-only */
39 /* machine-specific gpios */
60 …CARD_RESET (H3XXX_EGPIO_BASE + 1) /* reset the attached pcmcia/compactflash card. active high. */
61 #define H3XXX_EGPIO_OPT_RESET (H3XXX_EGPIO_BASE + 2) /* reset the attached option pack. active hi…
62 #define H3XXX_EGPIO_CODEC_NRESET (H3XXX_EGPIO_BASE + 3) /* reset the onboard UDA1341. active low. …
63 #define H3XXX_EGPIO_OPT_NVRAM_ON (H3XXX_EGPIO_BASE + 4) /* apply power to optionpack nvram, active …
64 #define H3XXX_EGPIO_OPT_ON (H3XXX_EGPIO_BASE + 5) /* full power to option pack. active high. */
65 #define H3XXX_EGPIO_LCD_ON (H3XXX_EGPIO_BASE + 6) /* enable 3.3V to LCD. active high. */
66 #define H3XXX_EGPIO_RS232_ON (H3XXX_EGPIO_BASE + 7) /* UART3 transceiver force on. Active high. */
69 #define H3600_EGPIO_LCD_PCI (H3XXX_EGPIO_BASE + 8) /* LCD control IC enable. active high. */
[all …]
/linux/Documentation/devicetree/bindings/sound/
H A Drohm,bd28623.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
15 - Katsuhiro Suzuki <katsuhiro@katsuster.net>
18 - $ref: dai-common.yaml#
24 "#sound-dai-cells":
27 VCCA-supply:
29 regulator phandle for the VCCA (for analog) power supply
31 VCCP1-supply:
33 regulator phandle for the VCCP1 (for ch1) power supply
[all …]
/linux/Documentation/devicetree/bindings/power/reset/
H A Dgpio-restart.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/power/reset/gpio-restart.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Sebastian Reichel <sre@kernel.org>
17 'open-source' is not found, the GPIO line will be driven in the inactive state. Otherwise its
21 is configured as an output, and driven active, triggering a level triggered reset condition.
22 This will also cause an inactive->active edge condition, triggering positive edge triggered
23 reset. After a delay specified by active-delay, the GPIO is set to inactive, thus causing an
24 active->inactive edge, triggering negative edge triggered reset. After a delay specified by
[all …]

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