ARM: OMAP2: Clockdomain: Add base OMAP2/3 clockdomain code

This patch creates an interface to the clockdomain 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.

The patch also adds clockdomain usecount tracking.  This is intended
to be called whenever the first clock in a clockdomain is enabled, or
when the last enabled clock in a clockdomain is disabled.  If the
clockdomain is in software-supervised mode, the code will force-wakeup
or force-sleep the clockdomain.  If the clockdomain is in
hardware-supervised mode, the first clock enable will add sleep and
wakeup dependencies on a user-selectable set of parent domains (usually
MPU & IVA2), and the disable will remove them.

Each clockdomain will be defined in later patches as static
structures.  The clockdomain structures are linked into a list at boot
by clkdm_register(), similar to the OMAP clock code.

The patch adds a Kconfig option, CONFIG_OMAP_DEBUG_CLOCKDOMAIN, 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 e815fa35f7f4..ef62bf21e179 100644
--- a/arch/arm/plat-omap/Kconfig
+++ b/arch/arm/plat-omap/Kconfig
@@ -41,6 +41,18 @@ config OMAP_DEBUG_POWERDOMAIN
           for every powerdomain register write.  However, the
           extra detail costs some memory.
 
+config OMAP_DEBUG_CLOCKDOMAIN
+        bool "Emit debug messages from clockdomain layer"
+        depends on ARCH_OMAP2 || ARCH_OMAP3
+        default n
+        help
+          Say Y here if you want to compile in clockdomain layer
+          debugging messages for OMAP2/3.   These messages can
+          provide more detail as to why some clockdomain calls
+          may be failing, and will also emit a descriptive message
+          for every clockdomain register write.  However, the
+          extra detail costs some memory.
+
 config OMAP_RESET_CLOCKS
         bool "Reset unused clocks during boot"
         depends on ARCH_OMAP