clk: divider: Switch from .round_rate to .determine_rate by default

.determine_rate is meant to replace .round_rate. The former comes with a
benefit which is especially relevant on 32-bit systems: since
.determine_rate uses an "unsigned long" (compared to a "signed long"
which is used by .round_rate) the maximum value on 32-bit systems
increases from 2^31 (or approx. 2.14GHz) to 2^32 (or approx. 4.29GHz).
Switch to a .determine_rate implementation by default so 32-bit systems
can benefit from the increased maximum value as well as so we have one
fewer user of .round_rate.

Reviewed-by: Jerome Brunet <[email protected]>
Signed-off-by: Martin Blumenstingl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stephen Boyd <[email protected]>

drivers/clk/clk-divider.c

@@ -425,8 +425,8 @@ long divider_ro_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent,
 }
 EXPORT_SYMBOL_GPL(divider_ro_round_rate_parent);
 
-static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
-				unsigned long *prate)
+static int clk_divider_determine_rate(struct clk_hw *hw,
+				      struct clk_rate_request *req)
 {
 	struct clk_divider *divider = to_clk_divider(hw);
 
@@ -437,13 +437,13 @@ static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
 		val = clk_div_readl(divider) >> divider->shift;
 		val &= clk_div_mask(divider->width);
 
-		return divider_ro_round_rate(hw, rate, prate, divider->table,
-					     divider->width, divider->flags,
-					     val);
+		return divider_ro_determine_rate(hw, req, divider->table,
+						 divider->width,
+						 divider->flags, val);
 	}
 
-	return divider_round_rate(hw, rate, prate, divider->table,
-				  divider->width, divider->flags);
+	return divider_determine_rate(hw, req, divider->table, divider->width,
+				      divider->flags);
 }
 
 int divider_get_val(unsigned long rate, unsigned long parent_rate,
@@ -500,14 +500,14 @@ static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
 
 const struct clk_ops clk_divider_ops = {
 	.recalc_rate = clk_divider_recalc_rate,
-	.round_rate = clk_divider_round_rate,
+	.determine_rate = clk_divider_determine_rate,
 	.set_rate = clk_divider_set_rate,
 };
 EXPORT_SYMBOL_GPL(clk_divider_ops);
 
 const struct clk_ops clk_divider_ro_ops = {
 	.recalc_rate = clk_divider_recalc_rate,
-	.round_rate = clk_divider_round_rate,
+	.determine_rate = clk_divider_determine_rate,
 };
 EXPORT_SYMBOL_GPL(clk_divider_ro_ops);