clk: sunxi-ng: Remove the use of rational computations

While the rational library works great, it doesn't really allow us to add
more constraints, like the minimum.

Remove that in order to be able to deal with the constraints we'll need.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>

1 files changed, 15 insertions, 16 deletions

diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
index 059fdc3b4f96..0b08d000eb38 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.c
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c
@@ -9,7 +9,6 @@
  */
 
 #include <linux/clk-provider.h>
-#include <linux/rational.h>
 
 #include "ccu_gate.h"
 #include "ccu_nkm.h"
@@ -28,21 +27,21 @@ static void ccu_nkm_find_best(unsigned long parent, unsigned long rate,
 	unsigned long _n, _k, _m;
 
 	for (_k = 1; _k <= nkm->max_k; _k++) {
-		unsigned long tmp_rate;
-
-		rational_best_approximation(rate / _k, parent,
-					    nkm->max_n, nkm->max_m, &_n, &_m);
-
-		tmp_rate = parent * _n * _k / _m;
-
-		if (tmp_rate > rate)
-			continue;
-
-		if ((rate - tmp_rate) < (rate - best_rate)) {
-			best_rate = tmp_rate;
-			best_n = _n;
-			best_k = _k;
-			best_m = _m;
+		for (_n = 1; _n <= nkm->max_n; _n++) {
+			for (_m = 1; _n <= nkm->max_m; _m++) {
+				unsigned long tmp_rate;
+
+				tmp_rate = parent * _n * _k / _m;
+
+				if (tmp_rate > rate)
+					continue;
+				if ((rate - tmp_rate) < (rate - best_rate)) {
+					best_rate = tmp_rate;
+					best_n = _n;
+					best_k = _k;
+					best_m = _m;
+				}
+			}
 		}
 	}