clk: ti: check clock type before doing autoidle ops

Code might use autoidle api with clocks not being omap2 clocks,
so check if clock type is really omap2.
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>

drivers/clk/ti/autoidle.c

@@ -82,9 +82,15 @@ static int _omap2_clk_allow_idle(struct clk_hw_omap *clk)
  */
 int omap2_clk_deny_idle(struct clk *clk)
 {
-	struct clk_hw_omap *c = to_clk_hw_omap(__clk_get_hw(clk));
+	struct clk_hw *hw = __clk_get_hw(clk);
+
+	if (omap2_clk_is_hw_omap(hw)) {
+		struct clk_hw_omap *c = to_clk_hw_omap(hw);
 
 		return _omap2_clk_deny_idle(c);
+	}
+
+	return -EINVAL;
 }
 
 /**
@@ -95,9 +101,15 @@ int omap2_clk_deny_idle(struct clk *clk)
  */
 int omap2_clk_allow_idle(struct clk *clk)
 {
-	struct clk_hw_omap *c = to_clk_hw_omap(__clk_get_hw(clk));
+	struct clk_hw *hw = __clk_get_hw(clk);
+
+	if (omap2_clk_is_hw_omap(hw)) {
+		struct clk_hw_omap *c = to_clk_hw_omap(hw);
 
 		return _omap2_clk_allow_idle(c);
+	}
+
+	return -EINVAL;
 }
 
 static void _allow_autoidle(struct clk_ti_autoidle *clk)