diff --git a/drivers/clk/sunxi-ng/Kconfig b/drivers/clk/sunxi-ng/Kconfig
index 254d9526c018..1b4c55a53d7a 100644
--- a/drivers/clk/sunxi-ng/Kconfig
+++ b/drivers/clk/sunxi-ng/Kconfig
@@ -35,17 +35,14 @@ config SUNXI_CCU_NK
 
 config SUNXI_CCU_NKM
 	bool
-	select RATIONAL
 	select SUNXI_CCU_GATE
 
 config SUNXI_CCU_NKMP
 	bool
-	select RATIONAL
 	select SUNXI_CCU_GATE
 
 config SUNXI_CCU_NM
 	bool
-	select RATIONAL
 	select SUNXI_CCU_FRAC
 	select SUNXI_CCU_GATE
 
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;
+				}
+			}
 		}
 	}
 
diff --git a/drivers/clk/sunxi-ng/ccu_nkmp.c b/drivers/clk/sunxi-ng/ccu_nkmp.c
index 9769dee99511..4b457d8cce11 100644
--- a/drivers/clk/sunxi-ng/ccu_nkmp.c
+++ b/drivers/clk/sunxi-ng/ccu_nkmp.c
@@ -9,16 +9,15 @@
  */
 
 #include <linux/clk-provider.h>
-#include <linux/rational.h>
 
 #include "ccu_gate.h"
 #include "ccu_nkmp.h"
 
 struct _ccu_nkmp {
-	unsigned long	n, max_n;
-	unsigned long	k, max_k;
-	unsigned long	m, max_m;
-	unsigned long	p, max_p;
+	unsigned long	n, min_n, max_n;
+	unsigned long	k, min_k, max_k;
+	unsigned long	m, min_m, max_m;
+	unsigned long	p, min_p, max_p;
 };
 
 static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate,
@@ -29,24 +28,24 @@ static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate,
 	unsigned long _n, _k, _m, _p;
 
 	for (_k = 1; _k <= nkmp->max_k; _k++) {
-		for (_p = 1; _p <= nkmp->max_p; _p <<= 1) {
-			unsigned long tmp_rate;
-
-			rational_best_approximation(rate / _k, parent / _p,
-						    nkmp->max_n, nkmp->max_m,
-						    &_n, &_m);
-
-			tmp_rate = parent * _n * _k / (_m * _p);
-
-			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;
-				best_p = _p;
+		for (_n = 1; _n <= nkm->max_n; _n++) {
+			for (_m = 1; _n <= nkm->max_m; _m++) {
+				for (_p = 1; _p <= nkmp->max_p; _p <<= 1) {
+					unsigned long tmp_rate;
+
+					tmp_rate = parent * _n * _k / (_m * _p);
+
+					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;
+						best_p = _p;
+					}
+				}
 			}
 		}
 	}
diff --git a/drivers/clk/sunxi-ng/ccu_nm.c b/drivers/clk/sunxi-ng/ccu_nm.c
index b61bdd8c7a7f..c6d652289320 100644
--- a/drivers/clk/sunxi-ng/ccu_nm.c
+++ b/drivers/clk/sunxi-ng/ccu_nm.c
@@ -9,12 +9,42 @@
  */
 
 #include <linux/clk-provider.h>
-#include <linux/rational.h>
 
 #include "ccu_frac.h"
 #include "ccu_gate.h"
 #include "ccu_nm.h"
 
+struct _ccu_nm {
+	unsigned long	n, max_n;
+	unsigned long	m, max_m;
+};
+
+static void ccu_nm_find_best(unsigned long parent, unsigned long rate,
+			     struct _ccu_nm *nm)
+{
+	unsigned long best_rate = 0;
+	unsigned long best_n = 0, best_m = 0;
+	unsigned long _n, _m;
+
+	for (_n = 1; _n <= nm->max_n; _n++) {
+		for (_m = 1; _n <= nm->max_m; _m++) {
+			unsigned long tmp_rate = parent * _n  / _m;
+
+			if (tmp_rate > rate)
+				continue;
+
+			if ((rate - tmp_rate) < (rate - best_rate)) {
+				best_rate = tmp_rate;
+				best_n = _n;
+				best_m = _m;
+			}
+		}
+	}
+
+	nm->n = best_n;
+	nm->m = best_m;
+}
+
 static void ccu_nm_disable(struct clk_hw *hw)
 {
 	struct ccu_nm *nm = hw_to_ccu_nm(hw);
@@ -61,24 +91,22 @@ static long ccu_nm_round_rate(struct clk_hw *hw, unsigned long rate,
 			      unsigned long *parent_rate)
 {
 	struct ccu_nm *nm = hw_to_ccu_nm(hw);
-	unsigned long max_n, max_m;
-	unsigned long n, m;
+	struct _ccu_nm _nm;
 
-	max_n = 1 << nm->n.width;
-	max_m = nm->m.max ?: 1 << nm->m.width;
+	_nm.max_n = 1 << nm->n.width;
+	_nm.max_m = nm->m.max ?: 1 << nm->m.width;
 
-	rational_best_approximation(rate, *parent_rate, max_n, max_m, &n, &m);
+	ccu_nm_find_best(*parent_rate, rate, &_nm);
 
-	return *parent_rate * n / m;
+	return *parent_rate * _nm.n / _nm.m;
 }
 
 static int ccu_nm_set_rate(struct clk_hw *hw, unsigned long rate,
 			   unsigned long parent_rate)
 {
 	struct ccu_nm *nm = hw_to_ccu_nm(hw);
+	struct _ccu_nm _nm;
 	unsigned long flags;
-	unsigned long max_n, max_m;
-	unsigned long n, m;
 	u32 reg;
 
 	if (ccu_frac_helper_has_rate(&nm->common, &nm->frac, rate))
@@ -86,10 +114,10 @@ static int ccu_nm_set_rate(struct clk_hw *hw, unsigned long rate,
 	else
 		ccu_frac_helper_disable(&nm->common, &nm->frac);
 
-	max_n = 1 << nm->n.width;
-	max_m = nm->m.max ?: 1 << nm->m.width;
+	_nm.max_n = 1 << nm->n.width;
+	_nm.max_m = nm->m.max ?: 1 << nm->m.width;
 
-	rational_best_approximation(rate, parent_rate, max_n, max_m, &n, &m);
+	ccu_nm_find_best(parent_rate, rate, &_nm);
 
 	spin_lock_irqsave(nm->common.lock, flags);
 
@@ -97,7 +125,7 @@ static int ccu_nm_set_rate(struct clk_hw *hw, unsigned long rate,
 	reg &= ~GENMASK(nm->n.width + nm->n.shift - 1, nm->n.shift);
 	reg &= ~GENMASK(nm->m.width + nm->m.shift - 1, nm->m.shift);
 
-	writel(reg | ((m - 1) << nm->m.shift) | ((n - 1) << nm->n.shift),
+	writel(reg | ((_nm.m - 1) << nm->m.shift) | ((_nm.n - 1) << nm->n.shift),
 	       nm->common.base + nm->common.reg);
 
 	spin_unlock_irqrestore(nm->common.lock, flags);
