Battery indicator overlay

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Hey guys,

Using a A20 board with AXP209, using mainline, I am trying to add a battery indicator as an overlay on video signal so that user can see remaining battery %. Something similar to smartphone battery indicator.


Any idea how to do this?


This shows how to get battery % but how to add an overlay? 


This sounds like something that probably have already been done. Do you know any existing reference ?


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