| # SPDX-License-Identifier: GPL-2.0-only |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/leds/common.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: Common leds properties |
| |
| maintainers: |
| - Jacek Anaszewski <jacek.anaszewski@gmail.com> |
| - Pavel Machek <pavel@ucw.cz> |
| |
| description: |
| LED and flash LED devices provide the same basic functionality as current |
| regulators, but extended with LED and flash LED specific features like |
| blinking patterns, flash timeout, flash faults and external flash strobe mode. |
| |
| Many LED devices expose more than one current output that can be connected |
| to one or more discrete LED component. Since the arrangement of connections |
| can influence the way of the LED device initialization, the LED components |
| have to be tightly coupled with the LED device binding. They are represented |
| by child nodes of the parent LED device binding. |
| |
| properties: |
| led-sources: |
| description: |
| List of device current outputs the LED is connected to. The outputs are |
| identified by the numbers that must be defined in the LED device binding |
| documentation. |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| |
| function: |
| description: |
| LED function. Use one of the LED_FUNCTION_* prefixed definitions |
| from the header include/dt-bindings/leds/common.h. If there is no |
| matching LED_FUNCTION available, add a new one. |
| $ref: /schemas/types.yaml#/definitions/string |
| |
| color: |
| description: |
| Color of the LED. Use one of the LED_COLOR_ID_* prefixed definitions from |
| the header include/dt-bindings/leds/common.h. If there is no matching |
| LED_COLOR_ID available, add a new one. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| minimum: 0 |
| maximum: 9 |
| |
| function-enumerator: |
| description: |
| Integer to be used when more than one instance of the same function is |
| needed, differing only with an ordinal number. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| |
| label: |
| description: |
| The label for this LED. If omitted, the label is taken from the node name |
| (excluding the unit address). It has to uniquely identify a device, i.e. |
| no other LED class device can be assigned the same label. This property is |
| deprecated - use 'function' and 'color' properties instead. |
| function-enumerator has no effect when this property is present. |
| |
| default-state: |
| description: |
| The initial state of the LED. If the LED is already on or off and the |
| default-state property is set the to same value, then no glitch should be |
| produced where the LED momentarily turns off (or on). The "keep" setting |
| will keep the LED at whatever its current state is, without producing a |
| glitch. |
| $ref: /schemas/types.yaml#/definitions/string |
| enum: |
| - on |
| - off |
| - keep |
| default: off |
| |
| linux,default-trigger: |
| description: |
| This parameter, if present, is a string defining the trigger assigned to |
| the LED. |
| $ref: /schemas/types.yaml#/definitions/string |
| |
| enum: |
| # LED will act as a back-light, controlled by the framebuffer system |
| - backlight |
| # LED will turn on (but for leds-gpio see "default-state" property in |
| # Documentation/devicetree/bindings/leds/leds-gpio.yaml) |
| - default-on |
| # LED "double" flashes at a load average based rate |
| - heartbeat |
| # LED indicates disk activity |
| - disk-activity |
| # LED indicates IDE disk activity (deprecated), in new implementations |
| # use "disk-activity" |
| - ide-disk |
| # LED flashes at a fixed, configurable rate |
| - timer |
| # LED alters the brightness for the specified duration with one software |
| # timer (requires "led-pattern" property) |
| - pattern |
| |
| led-pattern: |
| description: | |
| Array of integers with default pattern for certain triggers. |
| |
| Each trigger may parse this property differently: |
| - one-shot : two numbers specifying delay on and delay off (in ms), |
| - timer : two numbers specifying delay on and delay off (in ms), |
| - pattern : the pattern is given by a series of tuples, of |
| brightness and duration (in ms). The exact format is |
| described in: |
| Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt |
| $ref: /schemas/types.yaml#/definitions/uint32-matrix |
| items: |
| minItems: 2 |
| maxItems: 2 |
| |
| led-max-microamp: |
| description: |
| Maximum LED supply current in microamperes. This property can be made |
| mandatory for the board configurations introducing a risk of hardware |
| damage in case an excessive current is set. |
| For flash LED controllers with configurable current this property is |
| mandatory for the LEDs in the non-flash modes (e.g. torch or indicator). |
| |
| panic-indicator: |
| description: |
| This property specifies that the LED should be used, if at all possible, |
| as a panic indicator. |
| type: boolean |
| |
| retain-state-shutdown: |
| description: |
| This property specifies that the LED should not be turned off or changed |
| when the system shuts down. |
| type: boolean |
| |
| trigger-sources: |
| description: | |
| List of devices which should be used as a source triggering this LED |
| activity. Some LEDs can be related to a specific device and should somehow |
| indicate its state. E.g. USB 2.0 LED may react to device(s) in a USB 2.0 |
| port(s). |
| Another common example is switch or router with multiple Ethernet ports |
| each of them having its own LED assigned (assuming they are not |
| hardwired). In such cases this property should contain phandle(s) of |
| related source device(s). |
| In many cases LED can be related to more than one device (e.g. one USB LED |
| vs. multiple USB ports). Each source should be represented by a node in |
| the device tree and be referenced by a phandle and a set of phandle |
| arguments. A length of arguments should be specified by the |
| #trigger-source-cells property in the source node. |
| $ref: /schemas/types.yaml#/definitions/phandle-array |
| |
| # Required properties for flash LED child nodes: |
| flash-max-microamp: |
| description: |
| Maximum flash LED supply current in microamperes. Required for flash LED |
| nodes with configurable current. |
| |
| flash-max-timeout-us: |
| description: |
| Maximum timeout in microseconds after which the flash LED is turned off. |
| Required for flash LED nodes with configurable timeout. |
| |
| additionalProperties: true |
| |
| examples: |
| - | |
| #include <dt-bindings/gpio/gpio.h> |
| #include <dt-bindings/leds/common.h> |
| |
| led-controller { |
| compatible = "gpio-leds"; |
| |
| led-0 { |
| function = LED_FUNCTION_STATUS; |
| linux,default-trigger = "heartbeat"; |
| gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>; |
| }; |
| |
| led-1 { |
| function = LED_FUNCTION_USB; |
| gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>; |
| trigger-sources = <&ohci_port1>, <&ehci_port1>; |
| }; |
| }; |
| |
| led-controller@0 { |
| compatible = "maxim,max77693-led"; |
| reg = <0 0x100>; |
| |
| led { |
| function = LED_FUNCTION_FLASH; |
| color = <LED_COLOR_ID_WHITE>; |
| led-sources = <0>, <1>; |
| led-max-microamp = <50000>; |
| flash-max-microamp = <320000>; |
| flash-max-timeout-us = <500000>; |
| }; |
| }; |
| |
| i2c { |
| #address-cells = <1>; |
| #size-cells = <0>; |
| |
| led-controller@30 { |
| compatible = "panasonic,an30259a"; |
| reg = <0x30>; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| |
| led@1 { |
| reg = <1>; |
| linux,default-trigger = "heartbeat"; |
| function = LED_FUNCTION_INDICATOR; |
| function-enumerator = <1>; |
| }; |
| |
| led@2 { |
| reg = <2>; |
| function = LED_FUNCTION_INDICATOR; |
| function-enumerator = <2>; |
| }; |
| |
| led@3 { |
| reg = <3>; |
| function = LED_FUNCTION_INDICATOR; |
| function-enumerator = <3>; |
| }; |
| }; |
| }; |
| |
| ... |
