[PATCH 0/4] Pinmux subsystem

[Valdis.Kletnieks@vt.edu (Valdis.Kletnieks at vt.edu)]

On Tue, 03 May 2011 19:27:12 +0200, Andrew Lunn said:

> I can think of two different solutions: 
> 
> 1) Three functions: uart-3wire, uart-hw-flow, uart-hw-flow-modem.  The
>    first just has 2 pins, the second 4 and the last 8. The board code
>    selects one of these for the serial driver to use.
> 
> 2) Three functions: uart-core, uart-hw-flow, uart-mode.  The first has
>    2 pins, the second has 2 pins and the last 4 pins. The board code tells
>    the driver to use uart-core, plus say uart-hw-flow.

For this second solution, what happens if some bozo selects *only* uart-modem
but not uart-core?  If there's a strict ordering (hw-flow requires core, modem
requires both hw-flow and core), it's essentially the same thing as the first
solution.  If there's not a strict ordering (i.e you can select uart-modem
without uart-core), you need to come up with sane semantics.

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