omap: clock: Check for enable/disable ops support

Check if enable/disable operations are supported for a given
clock node before attempting to call them.
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/clock.c

@@ -261,6 +261,7 @@ void omap2_clk_disable(struct clk *clk)
 
 	pr_debug("clock: %s: disabling in hardware\n", clk->name);
 
+	if (clk->ops && clk->ops->disable)
 		clk->ops->disable(clk);
 
 	if (clk->clkdm)
@@ -312,11 +313,14 @@ int omap2_clk_enable(struct clk *clk)
 		}
 	}
 
+	if (clk->ops && clk->ops->enable) {
 		ret = clk->ops->enable(clk);
 		if (ret) {
-		WARN(1, "clock: %s: could not enable: %d\n", clk->name, ret);
+			WARN(1, "clock: %s: could not enable: %d\n",
+			     clk->name, ret);
 			goto oce_err3;
 		}
+	}
 
 	return 0;