davinci: major rework of clock, PLL, PSC infrastructure

This is a significant rework of the low-level clock, PLL and Power
Sleep Controller (PSC) implementation for the DaVinci family.  The
primary goal is to have better modeling if the hardware clocks and
features with the aim of DVFS functionality.

Highlights:
- model PLLs and all PLL-derived clocks
- model parent/child relationships of PLLs and clocks
- convert to new clkdev layer
- view clock frequency and refcount via /proc/davinci_clocks

Special thanks to significant contributions and testing by David
Brownell.

Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/Kconfig

@@ -586,6 +586,7 @@ config ARCH_DAVINCI
 	select HAVE_CLK
 	select ZONE_DMA
 	select HAVE_IDE
+	select COMMON_CLKDEV
 	help
 	  Support for TI's DaVinci platform.
 

arch/arm/mach-davinci/Kconfig

@@ -18,6 +18,18 @@ config MACH_DAVINCI_EVM
 	  Configure this option to specify the whether the board used
 	  for development is a DaVinci EVM
 
+config DAVINCI_RESET_CLOCKS
+	bool "Reset unused clocks during boot"
+	depends on ARCH_DAVINCI
+	help
+	  Say Y if you want to reset unused clocks during boot.
+	  This option saves power, but assumes all drivers are
+	  using the clock framework. Broken drivers that do not
+	  yet use clock framework may not work with this option.
+	  If you are booting from another operating system, you
+	  probably do not want this option enabled until your
+	  device drivers work properly.
+
 endmenu
 
 endif

arch/arm/mach-davinci/board-evm.c

@@ -406,8 +406,6 @@ davinci_evm_map_io(void)
 
 static __init void davinci_evm_init(void)
 {
-	davinci_psc_init();
-
 #if defined(CONFIG_BLK_DEV_PALMCHIP_BK3710) || \
     defined(CONFIG_BLK_DEV_PALMCHIP_BK3710_MODULE)
 #if defined(CONFIG_MTD_PHYSMAP) || \