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ARM: OMAP2+: hwmod: RTC: Add lock and unlock functions

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RTC IP have kicker feature which prevents spurious writes to its registers.
In order to write into any of the RTC registers, KICK values has to be
written to KICK registers. Also, RTC busy flag needs to be polled for
non-TC registers as well, without which update is not proper and confirmed
it by testing on DRA7-evm.
Introduce omap_hwmod_rtc_unlock/lock functions, which  writes into these
KICK registers inorder to lock and unlock RTC registers.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
[paul@pwsan.com: fixed subject line]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Lokesh Vutla
2016-04-10 13:20:10 -06:00
committed by Paul Walmsley
parent b05ff3c394
commit 461932dfb5
2 changed files with 67 additions and 0 deletions
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arch/arm/mach-omap2/omap_hwmod.h
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@@ -754,6 +754,8 @@ const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh);
*/
extern int omap_hwmod_aess_preprogram(struct omap_hwmod *oh);
void omap_hwmod_rtc_unlock(struct omap_hwmod *oh);
void omap_hwmod_rtc_lock(struct omap_hwmod *oh);
/*
* Chip variant-specific hwmod init routines - XXX should be converted