[Kernel] Mainlining of Pyra nub joystick driver

[H. Nikolaus Schaller]

> Am 14.06.2016 um 19:02 schrieb Andrey Utkin <andrey_utkin at fastmail.com>:
> 
> On Tue, Jun 14, 2016 at 02:45:23PM +0300, Andrey Utkin wrote:
>> There's a pair of "nub" devices on Pyra handheld PC
>> ...
> 
> Update: found drivers/input/joystick/as5011.c in mainline kernel,
> will look how it works with as5013 hardware.

Before you spend too much time on it, they have not much in
common except the manufacturer and the as501x designation.

Register models (data sheet) are very different.

BR,
Nikolaus