OS, Grid and Database upgrade on ODA

We are planning to upgrade Grid and database on ODA running Linux as os Linux hostname 2.6.39-400.264.13.el6uek.x86_64 #1 SMP Thu Jan 7 15:49:50 PST 2016 x86_64 x86_64 x86_64 GNU/Linux

*Current versions:*

OS = 12.1.2.6.0
Grid = 12.1.0.2
Database 11.2.0.4

*Target versions:*

OS = 12.1.2.10.0
Gird = 12.2.0.1
Database = 12.2.0.1

Could someone point me to a good documentation for ODA for grid and database upgraded and all the pre-requisites?

Thanks in advance.

Thanks,
Moizuddin

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