1.. SPDX-License-Identifier: GPL-2.0 2 3=================================== 4Kernel driver for Spreadtrum SC27XX 5=================================== 6 7/sys/class/leds/<led>/hw_pattern 8-------------------------------- 9 10Specify a hardware pattern for the SC27XX LED. For the SC27XX 11LED controller, it only supports 4 stages to make a single 12hardware pattern, which is used to configure the rise time, 13high time, fall time and low time for the breathing mode. 14 15For the breathing mode, the SC27XX LED only expects one brightness 16for the high stage. To be compatible with the hardware pattern 17format, we should set brightness as 0 for rise stage, fall 18stage and low stage. 19 20- Min stage duration: 125 ms 21- Max stage duration: 31875 ms 22 23Since the stage duration step is 125 ms, the duration should be 24a multiplier of 125, like 125ms, 250ms, 375ms, 500ms ... 31875ms. 25 26Thus the format of the hardware pattern values should be: 27"0 rise_duration brightness high_duration 0 fall_duration 0 low_duration". 28