[RFC] OMAP: McBSP not working if CONFIG_PM_RUNTIME not set

Hi,

While solving this problem:
http://www.spinics.net/lists/linux-omap/msg52011.html,
I found that since commit e95496d4acadd0b72c4947be61e8d44700fdaae7, 
"OMAP: McBSP: Add pm runtime support", McBSP ports, or at least McBSP1 
on my Amstrad Delta, no longer work when CONFIG_PM_RUNTIME is not set. 
Even if I don't use such setup and always select CONFIG_PM_RUNTIME, I 
think current behaviour is wrong and should be corrected.

Before I come out with a patch, please advise if and how you think this 
should be solved. Should CONFIG_OMAP_MCBSP depend on CONFIG_PM_RUNTIME?
Or should it select CONFIG_PM_RUNTIME? Or maybe an old code which 
manipulated clocks directly should be restored for no CONFIG_PM_RUNTIME 
case? Or should arch/arm/mach-omap1/pm_bus.c be always built in and 
pm_runtime_clk_add_notifier() called from there in order to enable 
clocks on device initialization even if CONFIG_PM_RUNTIME is not set? Or 
still a better solution?

Thanks,
Janusz