[PATCH 1/4] drivers: create a pinmux subsystem

On 03/05/2011, at 5:16 AM, Linus Walleij wrote:

From: Linus Walleij <redacted>

This creates a subsystem for handling of pinmux devices. These are
devices that enable and disable groups of pins on primarily PGA and
BGA type of chip packages and common in embedded systems.

This is being done to depopulate the arch/arm/* directory of such
custom drivers and try to abstract the infrastructure they all
need. See the Documentation/pinmux.txt file that is part of this
patch for more details.

Haven't reviewed the actual code but at an interface level it seems
sane.  It'd be nice to actually implement a driver for some nutbars SoC
and make sure it all shakes out but in the first instance I can't see
any problems.

Leaving it orthogonal to gpio is a great move conceptually and if it does
need to be tied back to the gpio_request() interface later then, well,
we'll cross that bridge when we come to it.

Thanks for your work in this area, looking good.

	--Ben.