Hello Sri,
As far as I know, there is no a Linux driver for the PCF85263A device.
In this case, I am glad to share with you the document attached to this response: DEVELOPMENT OF A DRIVER IN LINUX/ANDROID.
This document explains how to program and use a driver into the i.MX families running Linux or Android as OS, this document will explain a few concepts that the developer should know to understand and program drivers or applications.
I hope you find it useful for your application.
Have a great day.
David Diaz.