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authorLinus Torvalds <torvalds@linux-foundation.org>2015-02-13 10:54:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-13 10:54:44 -0800
commitdb3ecdee1cf0538f11832f7ef66945c4dd903918 (patch)
treeb3e2b3f7ccc9a1b2ea4aa05ce5bb3f8debbe119e /Documentation
parenta42cf70eb81558082e9a26fe8541d160b6c2a694 (diff)
parentc6e71f813f7208d80bfe0f435d627fad1b204558 (diff)
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds
Pull LED subsystem update from Bryan Wu: "The big change of LED subsystem is introducing a new LED class for Flash type LEDs which will be used for V4L2 subsystem. Also we got some cleanup and fixes" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds: leds: leds-gpio: Pass on error codes unmodified DT: leds: Add led-sources property leds: Add LED Flash class extension to the LED subsystem leds: leds-mc13783: Use of_get_child_by_name() instead of refcount hack leds: Use setup_timer leds: Don't allow brightness values greater than max_brightness DT: leds: Add flash LED devices related properties
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/leds/common.txt30
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
index 2d88816dd550..34811c57db69 100644
--- a/Documentation/devicetree/bindings/leds/common.txt
+++ b/Documentation/devicetree/bindings/leds/common.txt
@@ -1,6 +1,19 @@
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
+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.
+
Optional properties for child nodes:
+- led-sources : 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.
- label : The label for this LED. If omitted, the label is
taken from the node name (excluding the unit address).
@@ -14,6 +27,15 @@ Optional properties for child nodes:
"ide-disk" - LED indicates disk activity
"timer" - LED flashes at a fixed, configurable rate
+- max-microamp : maximum intensity in microamperes of the LED
+ (torch LED for flash devices)
+- flash-max-microamp : maximum intensity in microamperes of the
+ flash LED; it is mandatory if the LED should
+ support the flash mode
+- flash-timeout-us : timeout in microseconds after which the flash
+ LED is turned off
+
+
Examples:
system-status {
@@ -21,3 +43,11 @@ system-status {
linux,default-trigger = "heartbeat";
...
};
+
+camera-flash {
+ label = "Flash";
+ led-sources = <0>, <1>;
+ max-microamp = <50000>;
+ flash-max-microamp = <320000>;
+ flash-timeout-us = <500000>;
+};