1 # SPDX-License-Identifier: GPL-2.0-only
4 $id: http://devicetree.org/schemas/leds/common.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Common leds properties
10 - Jacek Anaszewski <jacek.anaszewski@gmail.com>
11 - Pavel Machek <pavel@ucw.cz>
14 LED and flash LED devices provide the same basic functionality as current
15 regulators, but extended with LED and flash LED specific features like
16 blinking patterns, flash timeout, flash faults and external flash strobe mode.
18 Many LED devices expose more than one current output that can be connected
19 to one or more discrete LED component. Since the arrangement of connections
20 can influence the way of the LED device initialization, the LED components
21 have to be tightly coupled with the LED device binding. They are represented
22 by child nodes of the parent LED device binding.
27 List of device current outputs the LED is connected to. The outputs are
28 identified by the numbers that must be defined in the LED device binding
30 $ref: /schemas/types.yaml#/definitions/uint32-array
34 LED function. Use one of the LED_FUNCTION_* prefixed definitions
35 from the header include/dt-bindings/leds/common.h. If there is no
36 matching LED_FUNCTION available, add a new one.
37 $ref: /schemas/types.yaml#/definitions/string
41 Color of the LED. Use one of the LED_COLOR_ID_* prefixed definitions from
42 the header include/dt-bindings/leds/common.h. If there is no matching
43 LED_COLOR_ID available, add a new one.
44 $ref: /schemas/types.yaml#/definitions/uint32
50 Integer to be used when more than one instance of the same function is
51 needed, differing only with an ordinal number.
52 $ref: /schemas/types.yaml#/definitions/uint32
56 The label for this LED. If omitted, the label is taken from the node name
57 (excluding the unit address). It has to uniquely identify a device, i.e.
58 no other LED class device can be assigned the same label. This property is
59 deprecated - use 'function' and 'color' properties instead.
60 function-enumerator has no effect when this property is present.
64 The initial state of the LED. If the LED is already on or off and the
65 default-state property is set the to same value, then no glitch should be
66 produced where the LED momentarily turns off (or on). The "keep" setting
67 will keep the LED at whatever its current state is, without producing a
69 $ref: /schemas/types.yaml#/definitions/string
76 linux,default-trigger:
78 This parameter, if present, is a string defining the trigger assigned to
80 $ref: /schemas/types.yaml#/definitions/string
84 # LED will act as a back-light, controlled by the framebuffer system
86 # LED will turn on (but for leds-gpio see "default-state" property in
87 # Documentation/devicetree/bindings/leds/leds-gpio.yaml)
89 # LED "double" flashes at a load average based rate
91 # LED indicates disk activity
93 # LED indicates IDE disk activity (deprecated), in new implementations
96 # LED flashes at a fixed, configurable rate
98 # LED alters the brightness for the specified duration with one software
99 # timer (requires "led-pattern" property)
101 # LED is triggered by SD/MMC activity
102 - pattern: "^mmc[0-9]+$"
106 Array of integers with default pattern for certain triggers.
108 Each trigger may parse this property differently:
109 - one-shot : two numbers specifying delay on and delay off (in ms),
110 - timer : two numbers specifying delay on and delay off (in ms),
111 - pattern : the pattern is given by a series of tuples, of
112 brightness and duration (in ms). The exact format is
114 Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt
115 $ref: /schemas/types.yaml#/definitions/uint32-matrix
122 Maximum LED supply current in microamperes. This property can be made
123 mandatory for the board configurations introducing a risk of hardware
124 damage in case an excessive current is set.
125 For flash LED controllers with configurable current this property is
126 mandatory for the LEDs in the non-flash modes (e.g. torch or indicator).
130 This property specifies that the LED should be used, if at all possible,
131 as a panic indicator.
134 retain-state-shutdown:
136 This property specifies that the LED should not be turned off or changed
137 when the system shuts down.
142 List of devices which should be used as a source triggering this LED
143 activity. Some LEDs can be related to a specific device and should somehow
144 indicate its state. E.g. USB 2.0 LED may react to device(s) in a USB 2.0
146 Another common example is switch or router with multiple Ethernet ports
147 each of them having its own LED assigned (assuming they are not
148 hardwired). In such cases this property should contain phandle(s) of
149 related source device(s).
150 In many cases LED can be related to more than one device (e.g. one USB LED
151 vs. multiple USB ports). Each source should be represented by a node in
152 the device tree and be referenced by a phandle and a set of phandle
153 arguments. A length of arguments should be specified by the
154 #trigger-source-cells property in the source node.
155 $ref: /schemas/types.yaml#/definitions/phandle-array
157 # Required properties for flash LED child nodes:
160 Maximum flash LED supply current in microamperes. Required for flash LED
161 nodes with configurable current.
163 flash-max-timeout-us:
165 Maximum timeout in microseconds after which the flash LED is turned off.
166 Required for flash LED nodes with configurable timeout.
168 additionalProperties: true
172 #include <dt-bindings/gpio/gpio.h>
173 #include <dt-bindings/leds/common.h>
176 compatible = "gpio-leds";
179 function = LED_FUNCTION_STATUS;
180 linux,default-trigger = "heartbeat";
181 gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
185 function = LED_FUNCTION_USB;
186 gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;
187 trigger-sources = <&ohci_port1>, <&ehci_port1>;
192 #include <dt-bindings/leds/common.h>
195 compatible = "maxim,max77693-led";
198 function = LED_FUNCTION_FLASH;
199 color = <LED_COLOR_ID_WHITE>;
200 led-sources = <0>, <1>;
201 led-max-microamp = <50000>;
202 flash-max-microamp = <320000>;
203 flash-max-timeout-us = <500000>;
208 #include <dt-bindings/leds/common.h>
211 #address-cells = <1>;
215 compatible = "panasonic,an30259a";
217 #address-cells = <1>;
222 linux,default-trigger = "heartbeat";
223 function = LED_FUNCTION_INDICATOR;
224 function-enumerator = <1>;
229 function = LED_FUNCTION_INDICATOR;
230 function-enumerator = <2>;
235 function = LED_FUNCTION_INDICATOR;
236 function-enumerator = <3>;