On Wed, Jan 07, 2015 at 05:18:20PM +0000, Andrew Jackson wrote:

> I understand your difficulty!  I was just wanting something to clarify the 
> meaning of the value without reference to the driver source.

> You could add something like this to your existing explanation: "The value
> describes which audio input pins are selected; this varies depending
> on chip type so consult the section on audio port configuration in the 
> relevant datasheet.".  

This is commonly done by just saying that the value will be written into
a given bitfield for such and such a purpose and then relying on the
chip documentation for that; it's a more direct way of saying the above.