pinctrl-mxs fails to parse function definitions from different .dts files

[Shawn Guo]

Hi Uwe,

On Fri, Aug 30, 2013 at 11:27:25AM +0200, Uwe Kleine-König wrote:
> while when I move the definition of i2c1 at 1 into imx28.dtsi after i2c1 at 0
> i2c1 probes just fine and also the pinmux-functions look right:
> 	
> 	# grep i2c1 /sys/kernel/debug/pinctrl/80018000.pinctrl/pinmux-functions
> 	function: i2c1, groups = [ i2c1.0 i2c1.1 ]
> 
> This is not intended, is it?

Sorry.  I should have documented it somewhere, but this is intended.
The driver requires all the pin groups for given function be sorted
together in 'reg'.

Shawn