OMAP2+: voltage: split out voltage processor (VP) code into new layer

This patch is primarily a move of VP specific code from voltage.c into
its own code in vp.c and adds prototypes to vp.h

No functional changes, except debugfs...

VP debugfs moved to 'vp' subdir of <debugfs>/voltage/ and 'vp_'
prefixes removed from all debugfs filenames.
Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/mach-omap2/Makefile

@@ -90,7 +90,7 @@ obj-$(CONFIG_ARCH_OMAP4)		+= prcm.o cm2xxx_3xxx.o cminst44xx.o \
 
 # OMAP voltage domains
 ifeq ($(CONFIG_PM),y)
-voltagedomain-common			:= voltage.o vc.o
+voltagedomain-common			:= voltage.o vc.o vp.o
 obj-$(CONFIG_ARCH_OMAP2)		+= $(voltagedomain-common) \
 					   voltagedomains2xxx_data.o
 obj-$(CONFIG_ARCH_OMAP3)		+= $(voltagedomain-common) \

arch/arm/mach-omap2/voltage.h

@@ -152,9 +152,6 @@ struct omap_vdd_info {
 		unsigned long target_volt);
 };
 
-unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm);
-void omap_vp_enable(struct voltagedomain *voltdm);
-void omap_vp_disable(struct voltagedomain *voltdm);
 int omap_voltage_scale_vdd(struct voltagedomain *voltdm,
 		unsigned long target_volt);
 void omap_voltage_reset(struct voltagedomain *voltdm);

arch/arm/mach-omap2/vp.h

@@ -19,6 +19,8 @@
 
 #include <linux/kernel.h>
 
+struct voltagedomain;
+
 /* XXX document */
 #define VP_IDLE_TIMEOUT		200
 #define VP_TRANXDONE_TIMEOUT	300
@@ -139,4 +141,11 @@ extern struct omap_vp_instance_data omap4_vp_mpu_data;
 extern struct omap_vp_instance_data omap4_vp_iva_data;
 extern struct omap_vp_instance_data omap4_vp_core_data;
 
+void omap_vp_init(struct voltagedomain *voltdm);
+void omap_vp_enable(struct voltagedomain *voltdm);
+void omap_vp_disable(struct voltagedomain *voltdm);
+unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm);
+int omap_vp_forceupdate_scale(struct voltagedomain *voltdm,
+			      unsigned long target_volt);
+
 #endif