On Tue, Nov 08, 2016 at 05:59:41AM +0000, Eric Hyeung Dong Jeong wrote:

Thank you for the comments.
There was an internal request to release driver based on Kernel 3.18 for GPIO and MFD support.
After that, the code has been kept. I will send a patch again after changes.

Please don't submit code for ancient kernels upstream, we can't merge
anything that isn't for current kernels.