clk: fixed-rate: Add clk flags for parent accuracy

Some clk providers want to use the accuracy of the parent clk and use the fixed rate basic type clk to do that. This requires getting the parent clk and extracting the accuracy before registering the fixed rate clk. Let's add a flag for this and update the clk_ops to support this.

Stephen Boyd committed 7 years ago

Commit 58f0c4b1 parent 2d34f092 files · +12 −1Browse files

Unified · Split

2 files

drivers/clk/clk-fixed-rate.c +6 −1
include/linux/clk-provider.h +6 −0

drivers/clk/clk-fixed-rate.c+6−1

 static unsigned long clk_fixed_rate_recalc_accuracy(struct clk_hw *hw,
 		unsigned long parent_accuracy)
 {
-	return to_clk_fixed_rate(hw)->fixed_accuracy;
+	struct clk_fixed_rate *fixed = to_clk_fixed_rate(hw);
+	if (fixed->flags & CLK_FIXED_RATE_PARENT_ACCURACY)
+		return parent_accuracy;
+	return fixed->fixed_accuracy;
 }
 const struct clk_ops clk_fixed_rate_ops = {

include/linux/clk-provider.h+6−0

  * @fixed_rate:	constant frequency of clock
  * @fixed_accuracy: constant accuracy of clock in ppb (parts per billion)
  * @flags:	hardware specific flags
+ *
+ * Flags:
+ * * CLK_FIXED_RATE_PARENT_ACCURACY - Use the accuracy of the parent clk
+ *                                    instead of what's set in @fixed_accuracy.
  */
 struct clk_fixed_rate {
 	struct		clk_hw hw;
 	unsigned long	flags;
 };
+#define CLK_FIXED_RATE_PARENT_ACCURACY		BIT(0)
 extern const struct clk_ops clk_fixed_rate_ops;
 struct clk_hw *__clk_hw_register_fixed_rate(struct device *dev,
 		struct device_node *np, const char *name,