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ARM: OMAP2+: am335x: Change the wdt1 func clk src to per_32k clk

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WDT1 module can take one of the below clocks as input functional
clock -
     - On-Chip 32K RC Osc [default/reset]
     - 32K from PRCM

The On-Chip 32K RC Osc clock is not an accurate clock-source as per
the design/spec, so as a result, for example, timer which supposed
to get expired @60Sec, but will expire somewhere ~@40Sec, which is
not expected by any use-case.

The solution here is to switch the input clock-source to PRCM
generated 32K clock-source during boot-time itself.

Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Benoit Cousson <benoit.cousson@linaro.org>
Cc: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Vaibhav Hiremath 2013-03-31 20:22:21 -06:00 • committed by Paul Walmsley
parent 05cf03b6eb
commit da91b89eb7
1 changed files with 8 additions and 0 deletions
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8
arch/arm/mach-omap2/cclock33xx_data.c
View file

@ -958,6 +958,14 @@ int __init am33xx_clk_init(void)
clk_set_parent(&timer3_fck, &sys_clkin_ck);
clk_set_parent(&timer6_fck, &sys_clkin_ck);
/*
* The On-Chip 32K RC Osc clock is not an accurate clock-source as per
* the design/spec, so as a result, for example, timer which supposed
* to get expired @60Sec, but will expire somewhere ~@40Sec, which is
* not expected by any use-case, so change WDT1 clock source to PRCM
* 32KHz clock.
*/
clk_set_parent(&wdt1_fck, &clkdiv32k_ick);
return 0;
}