On 11/05/2012 04:31 PM, Russell King - ARM Linux wrote:

On Mon, Nov 05, 2012 at 04:28:05PM -0600, Mark Langsdorf wrote:

quoted

On 11/04/2012 04:08 AM, Russell King - ARM Linux wrote:

quoted

On Fri, Nov 02, 2012 at 01:51:44PM -0500, Mark Langsdorf wrote:

quoted

-static struct clk *twd_get_clock(void)
+static struct clk *twd_get_clock(struct device_node *np)
 {
-	struct clk *clk;
+	struct clk *clk = NULL;
 	int err;
 
-	clk = clk_get_sys("smp_twd", NULL);
+	if (np)
+		clk = of_clk_get(np, 0);
+	if (!clk)

What does a NULL return from of_clk_get() mean?  Where is this defined?

Well, it's a valid path if (np) is NULL. I'll add an IS_ERR(clk) and
resubmit.

Hang on - what logic are you trying to achieve here?  Wouldn't:

	if (np)
		clk = of_clk_get(np, 0);
	else
		clk = clk_get_sys("smp_twd", NULL);

be sufficient?  If we have DT, why would we ever want to fall back to
"smp_twd" ?

I'm just trying to make sure I have a clock so I can do cpufreq operations.

Your solution works and is sufficient. Thanks.

--Mark Langsdorf
Calxeda, Inc.