HI Shivani, Thank you for reply.
Yes. I am always able to charge the device even after its fully drained.
When device is "off" and user plugs in usb cable the PMIC boots up the CPU and uboot is loaded
after that android OS starts.
instead of starting android we just want to show charging status, so device does not boot Android OS and become fully functional.
I think this thread is more useful to me I will try to check that.->how to get the battery animation in u-boot