On 04/16/2014 07:14 AM, Lokesh Vutla wrote:
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.
This is derived from AM33xx clock file.
I guess this patch should wait until we have a proper solution upstream
for selecting parents based on DT data, unless you have pressing need to
merge this as a temporary hack.
-Tero
Signed-off-by: Lokesh Vutla <lokeshvutla@xxxxxx>
---
drivers/clk/ti/clk-43xx.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/clk/ti/clk-43xx.c b/drivers/clk/ti/clk-43xx.c
index 67c8de5..ae2524e 100644
--- a/drivers/clk/ti/clk-43xx.c
+++ b/drivers/clk/ti/clk-43xx.c
@@ -110,9 +110,22 @@ static struct ti_dt_clk am43xx_clks[] = {
int __init am43xx_dt_clk_init(void)
{
+ struct clk *clk1, *clk2;
+
ti_dt_clocks_register(am43xx_clks);
omap2_clk_disable_autoidle_all();
+ /*
+ * 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.
+ */
+ clk1 = clk_get_sys(NULL, "wdt1_fck");
+ clk2 = clk_get_sys(NULL, "clkdiv32k_ick");
+ clk_set_parent(clk1, clk2);
+
return 0;
}
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