clk: sunxi-ng: multiplier: Add fractional support

Some clocks on the earlier SoCs such as the video PLLs are multipliers with
fractional settings.

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

drivers/clk/sunxi-ng/ccu_mult.c

@@ -75,6 +75,9 @@ static unsigned long ccu_mult_recalc_rate(struct clk_hw *hw,
 	unsigned long val;
 	u32 reg;
 
+	if (ccu_frac_helper_is_enabled(&cm->common, &cm->frac))
+		return ccu_frac_helper_read_rate(&cm->common, &cm->frac);
+
 	reg = readl(cm->common.base + cm->common.reg);
 	val = reg >> cm->mult.shift;
 	val &= (1 << cm->mult.width) - 1;
@@ -102,6 +105,11 @@ static int ccu_mult_set_rate(struct clk_hw *hw, unsigned long rate,
 	unsigned long flags;
 	u32 reg;
 
+	if (ccu_frac_helper_has_rate(&cm->common, &cm->frac, rate))
+		return ccu_frac_helper_set_rate(&cm->common, &cm->frac, rate);
+	else
+		ccu_frac_helper_disable(&cm->common, &cm->frac);
+
 	ccu_mux_helper_adjust_parent_for_prediv(&cm->common, &cm->mux, -1,
 						&parent_rate);
 

drivers/clk/sunxi-ng/ccu_mult.h

@@ -2,6 +2,7 @@
 #define _CCU_MULT_H_
 
 #include "ccu_common.h"
+#include "ccu_frac.h"
 #include "ccu_mux.h"
 
 struct ccu_mult_internal {
@@ -23,6 +24,7 @@ struct ccu_mult_internal {
 struct ccu_mult {
 	u32			enable;
 
+	struct ccu_frac_internal	frac;
 	struct ccu_mult_internal	mult;
 	struct ccu_mux_internal	mux;
 	struct ccu_common	common;