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authorJames Morris <jmorris@namei.org>2011-01-09 23:46:24 +0100
committerJames Morris <jmorris@namei.org>2011-01-09 23:46:24 +0100
commitd2e7ad19229f982fc1eb731827d82ceac90abfb3 (patch)
tree98a3741b4d4b27a48b3c7ea9babe331e539416a8 /Documentation/arm/OMAP/omap_pm
parentMAINTAINERS: Add tomoyo-dev-en ML. (diff)
parentMerge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/... (diff)
downloadlinux-d2e7ad19229f982fc1eb731827d82ceac90abfb3.tar.xz
linux-d2e7ad19229f982fc1eb731827d82ceac90abfb3.zip
Merge branch 'master' into next
Conflicts: security/smack/smack_lsm.c Verified and added fix by Stephen Rothwell <sfr@canb.auug.org.au> Ok'd by Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'Documentation/arm/OMAP/omap_pm')
-rw-r--r--Documentation/arm/OMAP/omap_pm25
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/arm/OMAP/omap_pm b/Documentation/arm/OMAP/omap_pm
index 5389440aade3..9012bb039094 100644
--- a/Documentation/arm/OMAP/omap_pm
+++ b/Documentation/arm/OMAP/omap_pm
@@ -127,3 +127,28 @@ implementation needs:
10. (*pdata->cpu_set_freq)(unsigned long f)
11. (*pdata->cpu_get_freq)(void)
+
+Customizing OPP for platform
+============================
+Defining CONFIG_PM should enable OPP layer for the silicon
+and the registration of OPP table should take place automatically.
+However, in special cases, the default OPP table may need to be
+tweaked, for e.g.:
+ * enable default OPPs which are disabled by default, but which
+ could be enabled on a platform
+ * Disable an unsupported OPP on the platform
+ * Define and add a custom opp table entry
+in these cases, the board file needs to do additional steps as follows:
+arch/arm/mach-omapx/board-xyz.c
+ #include "pm.h"
+ ....
+ static void __init omap_xyz_init_irq(void)
+ {
+ ....
+ /* Initialize the default table */
+ omapx_opp_init();
+ /* Do customization to the defaults */
+ ....
+ }
+NOTE: omapx_opp_init will be omap3_opp_init or as required
+based on the omap family.