leds: Add support for hardware accelerated LED flashing

Extends the leds subsystem with a blink_set() callback function which can
be optionally implemented by a LED driver. If implemented, the driver can use
the hardware acceleration for blinking a LED.

Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index cf3a6d4d947..659448ead68 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -152,7 +152,11 @@ config LEDS_TRIGGER_TIMER
         depends on LEDS_TRIGGERS
         help
           This allows LEDs to be controlled by a programmable timer
-          via sysfs. If unsure, say Y.
+          via sysfs. Some LED hardware can be programmed to start
+          blinking the LED without any further software interaction.
+          For more details read Documentation/leds-class.txt.
+
+          If unsure, say Y.
 
 config LEDS_TRIGGER_IDE_DISK
         bool "LED IDE Disk Trigger"