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

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>

diff --git a/arch/arm/mach-omap2/cclock33xx_data.c b/arch/arm/mach-omap2/cclock33xx_data.c
index 476b820..7f091c8 100644 (file)
--- a/arch/arm/mach-omap2/cclock33xx_data.c
+++ b/arch/arm/mach-omap2/cclock33xx_data.c
@@ -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;
 }