ARM: OMAP2: Powerdomain: Add base OMAP2/3 powerdomain code

This patch creates an interface to the powerdomain registers in the
PRM/CM modules on OMAP2/3.  This interface is intended to be used by
PM code, e.g., pm.c; not by device drivers directly.

Each powerdomain will be defined in later patches as static
structures.  Also defined are dependencies between powerdomains,
used for adding and removing PM_WKDEP and CM_SLEEPDEP bits.  The
powerdomain structures are linked into a list at boot by
pwrdm_register(), similar to the OMAP clock code.

The patch adds a Kconfig option, CONFIG_OMAP_DEBUG_POWERDOMAIN, which
when enabled will emit verbose debug messages via pr_debug().

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig
index b917206ee906..e815fa35f7f4 100644
--- a/arch/arm/plat-omap/Kconfig
+++ b/arch/arm/plat-omap/Kconfig
@@ -29,6 +29,18 @@ config OMAP_DEBUG_LEDS
         depends on OMAP_DEBUG_DEVICES
         default y if LEDS || LEDS_OMAP_DEBUG
 
+config OMAP_DEBUG_POWERDOMAIN
+        bool "Emit debug messages from powerdomain layer"
+        depends on ARCH_OMAP2 || ARCH_OMAP3
+        default n
+        help
+          Say Y here if you want to compile in powerdomain layer
+          debugging messages for OMAP2/3.   These messages can
+          provide more detail as to why some powerdomain calls
+          may be failing, and will also emit a descriptive message
+          for every powerdomain register write.  However, the
+          extra detail costs some memory.
+
 config OMAP_RESET_CLOCKS
         bool "Reset unused clocks during boot"
         depends on ARCH_OMAP