12-22-2017, 04:07 AM
(This post was last modified: 12-22-2017, 04:09 AM by Velociraptor.)
(12-03-2017, 03:56 PM)xalius Wrote: The PMIC and battery parameters are actually all read from the devicetree file, so to change them requires only dtc (the device tree compilter). The devicetree files for each board are in the /boot folder (.dtb). The dtc converts the binary back to a text file and creates the new binary from the text file after edits. The parameters correspond more or less to the registers in the AXP803 datasheet. One important thing is, the register settings are persistent as long as the AXP has either input power or battery power! And the linux driver updates the battery parameters only once if the AXP has empty registers. To reset that, all power has to be removed from the AXP. The battery charger only works properly if the battery parameters are persistent, e.g. the battery is not removed, since it is self learning and adapts certain values over charge cycles...
Hi xalius thanks to you info I found the dtb files and changed it like you said to dts, easily described here
So I was able to change the "pmu_battery_cap" to the capacity my battery actually has but I would like to also change the values which are seen in "/sys/class/power_supply/battery/uevent" like for example "POWER_SUPPLY_TECHNOLOGY" to LiPo and POWER_SUPPLY_VOLTAGE_MIN_DESIGN and so on according to this post it should be possible to echo it via rc.local but I am not sure if this is possible since its a different chip (AXP209)
Also how can I figure out which dtb file is used ? Since in my folder there are different once for each board and since I have a Pine64+ I would like to know if I am change the correct file
Would be nice to get an answer ... thanks in advance and happy holidays
