On Tue, Jun 12, 2012 at 09:41:48AM -0500, Rob Herring wrote:

+struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
+{
+	struct of_clk_provider *provider;
+	struct clk *clk = NULL;

Both clk and clkdev treat NULL as a valid clock and return ERR_PTR for
error case, while all the codes in this patch just return NULL for
error and check (clk != NULL) for valid clock.

Should we force the consistent behavior between DT and non-DT on this?

+
+	/* Check if we have such a provider in our array */
+	mutex_lock(&of_clk_lock);
+	list_for_each_entry(provider, &of_clk_providers, link) {
+		if (provider->node == clkspec->np)
+			clk = provider->get(clkspec, provider->data);
+		if (clk)
+			break;
+	}
+	mutex_unlock(&of_clk_lock);
+
+	return clk;
+}

-- 
Regards,
Shawn