clk: remove round_rate() clk ops

The round_rate() clk ops is deprecated, and all in tree drivers have
been converted, so let's go ahead and remove any references to the
round_rate() clk ops.

Signed-off-by: Brian Masney <bmasney@redhat.com>

Author: masneyb

Documentation/driver-api/clk.rst

@@ -77,9 +77,6 @@ the operations defined in clk-provider.h::
 		void		(*disable_unused)(struct clk_hw *hw);
 		unsigned long	(*recalc_rate)(struct clk_hw *hw,
 						unsigned long parent_rate);
-		long		(*round_rate)(struct clk_hw *hw,
-						unsigned long rate,
-						unsigned long *parent_rate);
 		int		(*determine_rate)(struct clk_hw *hw,
 						  struct clk_rate_request *req);
 		int		(*set_parent)(struct clk_hw *hw, u8 index);
@@ -220,9 +217,7 @@ optional or must be evaluated on a case-by-case basis.
    +----------------+------+-------------+---------------+-------------+------+
    |.recalc_rate    |      | y           |               |             |      |
    +----------------+------+-------------+---------------+-------------+------+
-   |.round_rate     |      | y [1]_      |               |             |      |
-   +----------------+------+-------------+---------------+-------------+------+
-   |.determine_rate |      | y [1]_      |               |             |      |
+   |.determine_rate |      | y           |               |             |      |
    +----------------+------+-------------+---------------+-------------+------+
    |.set_rate       |      | y           |               |             |      |
    +----------------+------+-------------+---------------+-------------+------+
@@ -238,8 +233,6 @@ optional or must be evaluated on a case-by-case basis.
    |.init           |      |             |               |             |      |
    +----------------+------+-------------+---------------+-------------+------+
 
-.. [1] either one of round_rate or determine_rate is required.
-
 Finally, register your clock at run-time with a hardware-specific
 registration function.  This function simply populates struct clk_foo's
 data and then passes the common struct clk parameters to the framework

drivers/clk/clk.c

@@ -1560,8 +1560,6 @@ late_initcall_sync(clk_disable_unused);
 static int clk_core_determine_round_nolock(struct clk_core *core,
 					   struct clk_rate_request *req)
 {
-	long rate;
-
 	lockdep_assert_held(&prepare_lock);
 
 	if (!core)
@@ -1591,13 +1589,6 @@ static int clk_core_determine_round_nolock(struct clk_core *core,
 		req->rate = core->rate;
 	} else if (core->ops->determine_rate) {
 		return core->ops->determine_rate(core->hw, req);
-	} else if (core->ops->round_rate) {
-		rate = core->ops->round_rate(core->hw, req->rate,
-					     &req->best_parent_rate);
-		if (rate < 0)
-			return rate;
-
-		req->rate = rate;
 	} else {
 		return -EINVAL;
 	}
@@ -1682,7 +1673,7 @@ EXPORT_SYMBOL_GPL(clk_hw_forward_rate_request);
 
 static bool clk_core_can_round(struct clk_core * const core)
 {
-	return core->ops->determine_rate || core->ops->round_rate;
+	return core->ops->determine_rate;
 }
 
 static int clk_core_round_rate_nolock(struct clk_core *core,
@@ -1750,11 +1741,11 @@ EXPORT_SYMBOL_GPL(__clk_determine_rate);
  * use.
  *
  * Context: prepare_lock must be held.
- *          For clk providers to call from within clk_ops such as .round_rate,
+ *          For clk providers to call from within clk_ops such as
  *          .determine_rate.
  *
- * Return: returns rounded rate of hw clk if clk supports round_rate operation
- *         else returns the parent rate.
+ * Return: returns rounded rate of hw clk if clk supports determine_rate
+ *         operation; else returns the parent rate.
  */
 unsigned long clk_hw_round_rate(struct clk_hw *hw, unsigned long rate)
 {
@@ -2569,12 +2560,13 @@ static int clk_core_set_rate_nolock(struct clk_core *core,
  *
  * Setting the CLK_SET_RATE_PARENT flag allows the rate change operation to
  * propagate up to clk's parent; whether or not this happens depends on the
- * outcome of clk's .round_rate implementation.  If *parent_rate is unchanged
- * after calling .round_rate then upstream parent propagation is ignored.  If
- * *parent_rate comes back with a new rate for clk's parent then we propagate
- * up to clk's parent and set its rate.  Upward propagation will continue
- * until either a clk does not support the CLK_SET_RATE_PARENT flag or
- * .round_rate stops requesting changes to clk's parent_rate.
+ * outcome of clk's .determine_rate implementation. If req->best_parent_rate
+ * is unchanged after calling .determine_rate then upstream parent propagation
+ * is ignored.  If req->best_parent_rate comes back with a new rate for clk's
+ * parent then we propagate up to clk's parent and set its rate. Upward
+ * propagation will continue until either a clk does not support the
+ * CLK_SET_RATE_PARENT flag or .determine_rate stops requesting changes to
+ * clk's parent_rate.
  *
  * Rate changes are accomplished via tree traversal that also recalculates the
  * rates for the clocks and fires off POST_RATE_CHANGE notifiers.
@@ -2703,8 +2695,6 @@ static int clk_set_rate_range_nolock(struct clk *clk,
 	 * FIXME:
 	 * There is a catch. It may fail for the usual reason (clock
 	 * broken, clock protected, etc) but also because:
-	 * - round_rate() was not favorable and fell on the wrong
-	 *   side of the boundary
 	 * - the determine_rate() callback does not really check for
 	 *   this corner case when determining the rate
 	 */
@@ -3915,10 +3905,9 @@ static int __clk_core_init(struct clk_core *core)
 	}
 
 	/* check that clk_ops are sane.  See Documentation/driver-api/clk.rst */
-	if (core->ops->set_rate &&
-	    !((core->ops->round_rate || core->ops->determine_rate) &&
-	      core->ops->recalc_rate)) {
-		pr_err("%s: %s must implement .round_rate or .determine_rate in addition to .recalc_rate\n",
+	if (core->ops->set_rate && !core->ops->determine_rate &&
+	      core->ops->recalc_rate) {
+		pr_err("%s: %s must implement .determine_rate in addition to .recalc_rate\n",
 		       __func__, core->name);
 		ret = -EINVAL;
 		goto out;

include/linux/clk-provider.h

@@ -136,10 +136,6 @@ struct clk_duty {
  *		0. Returns the calculated rate. Optional, but recommended - if
  *		this op is not set then clock rate will be initialized to 0.
  *
- * @round_rate:	Given a target rate as input, returns the closest rate actually
- *		supported by the clock. The parent rate is an input/output
- *		parameter.
- *
  * @determine_rate: Given a target rate as input, returns the closest rate
  *		actually supported by the clock, and optionally the parent clock
  *		that should be used to provide the clock rate.
@@ -163,13 +159,13 @@ struct clk_duty {
  *
  * @set_rate:	Change the rate of this clock. The requested rate is specified
  *		by the second argument, which should typically be the return
- *		of .round_rate call.  The third argument gives the parent rate
- *		which is likely helpful for most .set_rate implementation.
+ *		of .determine_rate call.  The third argument gives the parent
+ *		rate which is likely helpful for most .set_rate implementation.
  *		Returns 0 on success, -EERROR otherwise.
  *
  * @set_rate_and_parent: Change the rate and the parent of this clock. The
  *		requested rate is specified by the second argument, which
- *		should typically be the return of .round_rate call.  The
+ *		should typically be the return of clk_round_rate() call.  The
  *		third argument gives the parent rate which is likely helpful
  *		for most .set_rate_and_parent implementation. The fourth
  *		argument gives the parent index. This callback is optional (and
@@ -244,8 +240,6 @@ struct clk_ops {
 	void		(*restore_context)(struct clk_hw *hw);
 	unsigned long	(*recalc_rate)(struct clk_hw *hw,
 					unsigned long parent_rate);
-	long		(*round_rate)(struct clk_hw *hw, unsigned long rate,
-					unsigned long *parent_rate);
 	int		(*determine_rate)(struct clk_hw *hw,
 					  struct clk_rate_request *req);
 	int		(*set_parent)(struct clk_hw *hw, u8 index);
@@ -679,7 +673,7 @@ struct clk_div_table {
  * @lock:	register lock
  *
  * Clock with an adjustable divider affecting its output frequency.  Implements
- * .recalc_rate, .set_rate and .round_rate
+ * .recalc_rate, .set_rate and .determine_rate
  *
  * @flags:
  * CLK_DIVIDER_ONE_BASED - by default the divisor is the value read from the
@@ -1126,7 +1120,7 @@ void of_fixed_factor_clk_setup(struct device_node *node);
  *
  * Clock with a fixed multiplier and divider. The output frequency is the
  * parent clock rate divided by div and multiplied by mult.
- * Implements .recalc_rate, .set_rate, .round_rate and .recalc_accuracy
+ * Implements .recalc_rate, .set_rate, .determine_rate and .recalc_accuracy
  *
  * Flags:
  * * CLK_FIXED_FACTOR_FIXED_ACCURACY - Use the value in @acc instead of the
@@ -1254,7 +1248,7 @@ void clk_hw_unregister_fractional_divider(struct clk_hw *hw);
  * @lock:	register lock
  *
  * Clock with an adjustable multiplier affecting its output frequency.
- * Implements .recalc_rate, .set_rate and .round_rate
+ * Implements .recalc_rate, .set_rate and .determine_rate
  *
  * @flags:
  * CLK_MULTIPLIER_ZERO_BYPASS - By default, the multiplier is the value read