1 files changed, 26 insertions, 0 deletions

diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index b7cfa037e593..08b1aa70a38d 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -38,6 +38,8 @@
 #define CLK_IS_CRITICAL         BIT(11) /* do not gate, ever */
 /* parents need enable during gate/ungate, set rate and re-parent */
 #define CLK_OPS_PARENT_ENABLE   BIT(12)
+/* duty cycle call may be forwarded to the parent clock */
+#define CLK_DUTY_CYCLE_PARENT   BIT(13)
 
 struct clk;
 struct clk_hw;
@@ -67,6 +69,17 @@ struct clk_rate_request {
 };
 
 /**
+ * struct clk_duty - Struture encoding the duty cycle ratio of a clock
+ *
+ * @num:        Numerator of the duty cycle ratio
+ * @den:        Denominator of the duty cycle ratio
+ */
+struct clk_duty {
+        unsigned int num;
+        unsigned int den;
+};
+
+/**
  * struct clk_ops -  Callback operations for hardware clocks; these are to
  * be provided by the clock implementation, and will be called by drivers
  * through the clk_* api.
@@ -169,6 +182,15 @@ struct clk_rate_request {
  *              by the second argument. Valid values for degrees are
  *              0-359. Return 0 on success, otherwise -EERROR.
  *
+ * @get_duty_cycle: Queries the hardware to get the current duty cycle ratio
+ *              of a clock. Returned values denominator cannot be 0 and must be
+ *              superior or equal to the numerator.
+ *
+ * @set_duty_cycle: Apply the duty cycle ratio to this clock signal specified by
+ *              the numerator (2nd argurment) and denominator (3rd  argument).
+ *              Argument must be a valid ratio (denominator > 0
+ *              and >= numerator) Return 0 on success, otherwise -EERROR.
+ *
  * @init:       Perform platform-specific initialization magic.
  *              This is not not used by any of the basic clock types.
  *              Please consider other ways of solving initialization problems
@@ -218,6 +240,10 @@ struct clk_ops {
                                            unsigned long parent_accuracy);
         int             (*get_phase)(struct clk_hw *hw);
         int             (*set_phase)(struct clk_hw *hw, int degrees);
+        int             (*get_duty_cycle)(struct clk_hw *hw,
+                                          struct clk_duty *duty);
+        int             (*set_duty_cycle)(struct clk_hw *hw,
+                                          struct clk_duty *duty);
         void            (*init)(struct clk_hw *hw);
         void            (*debug_init)(struct clk_hw *hw, struct dentry *dentry);
 };