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dt-bindings: leds: document new trigger-sources property

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Some LEDs can be related to a specific device(s) described in the DT.
This property allows specifying such relations. E.g. USB LED should
usually be used to indicate some USB port(s) state.

Please note this binding is designed to be generic and not influenced by
any operating system design. Linux developers may find "trigger" part a
bit confusing since in Linux triggers are separated drivers. It
shouldn't define the binding though (we shouldn't add an extra level of
indirection).

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafał Miłecki 2017-06-08 18:08:31 +02:00 committed by Greg Kroah-Hartman
parent 8243edf441
commit 80dc6e1cd8
1 changed files with 33 additions and 2 deletions
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35
Documentation/devicetree/bindings/leds/common.txt
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@ -1,4 +1,4 @@
Common leds properties.
* Common leds properties.
LED and flash LED devices provide the same basic functionality as current
regulators, but extended with LED and flash LED specific features like
@ -49,6 +49,22 @@ Optional properties for child nodes:
- panic-indicator : This property specifies that the LED should be used,
if at all possible, as a panic indicator.
- trigger-sources : 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.
Required properties for flash LED child nodes:
- flash-max-microamp : Maximum flash LED supply current in microamperes.
- flash-max-timeout-us : Maximum timeout in microseconds after which the flash
@ -59,7 +75,17 @@ property can be omitted.
For controllers that have no configurable timeout the flash-max-timeout-us
property can be omitted.
Examples:
* Trigger source providers
Each trigger source should be represented by a device tree node. It may be e.g.
a USB port or an Ethernet device.
Required properties for trigger source:
- #trigger-source-cells : Number of cells in a source trigger. Typically 0 for
nodes of simple trigger sources (e.g. a specific USB
port).
* Examples
gpio-leds {
compatible = "gpio-leds";
@ -69,6 +95,11 @@ gpio-leds {
linux,default-trigger = "heartbeat";
gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
};
usb {
gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;
trigger-sources = <&ohci_port1>, <&ehci_port1>;
};
};
max77693-led {