clk: Add __clk_mux_determine_rate_closest
Some clock drivers want to find the closest rate on the input of
a mux instead of a rate that's less than or equal to the desired
rate. Add a generic mux function to support this.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Tested-by: Kenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: Michael Turquette <mturquette@linaro.org>
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index ebb7055..ba858e9 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -384,6 +384,8 @@
* register, and mask of mux bits are in higher 16-bit of this register.
* While setting the mux bits, higher 16-bit should also be updated to
* indicate changing mux bits.
+ * CLK_MUX_ROUND_CLOSEST - Use the parent rate that is closest to the desired
+ * frequency.
*/
struct clk_mux {
struct clk_hw hw;
@@ -398,7 +400,8 @@
#define CLK_MUX_INDEX_ONE BIT(0)
#define CLK_MUX_INDEX_BIT BIT(1)
#define CLK_MUX_HIWORD_MASK BIT(2)
-#define CLK_MUX_READ_ONLY BIT(3) /* mux setting cannot be changed */
+#define CLK_MUX_READ_ONLY BIT(3) /* mux can't be changed */
+#define CLK_MUX_ROUND_CLOSEST BIT(4)
extern const struct clk_ops clk_mux_ops;
extern const struct clk_ops clk_mux_ro_ops;
@@ -556,6 +559,9 @@
long __clk_mux_determine_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *best_parent_rate,
struct clk_hw **best_parent_p);
+long __clk_mux_determine_rate_closest(struct clk_hw *hw, unsigned long rate,
+ unsigned long *best_parent_rate,
+ struct clk_hw **best_parent_p);
/*
* FIXME clock api without lock protection