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+What: /sys/class/leds/<led>/pattern
+Date: September 2018
+KernelVersion: 4.20
+Description:
+ Specify a software pattern for the LED, that supports altering
+ the brightness for the specified duration with one software
+ timer. It can do gradual dimming and step change of brightness.
+
+ The pattern is given by a series of tuples, of brightness and
+ duration (ms).
+
+ The exact format is described in:
+ Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt
+
+What: /sys/class/leds/<led>/hw_pattern
+Date: September 2018
+KernelVersion: 4.20
+Description:
+ Specify a hardware pattern for the LED, for LED hardware that
+ supports autonomously controlling brightness over time, according
+ to some preprogrammed hardware patterns. It deactivates any active
+ software pattern.
+
+ Since different LED hardware can have different semantics of
+ hardware patterns, each driver is expected to provide its own
+ description for the hardware patterns in their documentation
+ file at Documentation/leds/.
+
+What: /sys/class/leds/<led>/repeat
+Date: September 2018
+KernelVersion: 4.20
+Description:
+ Specify a pattern repeat number. -1 means repeat indefinitely,
+ other negative numbers and number 0 are invalid.
+
+ This file will always return the originally written repeat
+ number.
+
+ It should be noticed that some leds, like EL15203000 may
+ only support indefinitely patterns, so they always store -1.