clk: sunxi-ng: mux: Support finding closest rate

When finding the best rate for a mux clock, consider rates that are
higher than the requested rate when CCU_FEATURE_ROUND_CLOSEST is used.
Furthermore, introduce an initialization macro that sets this flag.

Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>
Link: https://lore.kernel.org/r/20230807-pll-mipi_set_rate_parent-v6-8-f173239a4b59@oltmanns.dev
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

Author: Frank Oltmanns

drivers/clk/sunxi-ng/ccu_mux.c

@@ -242,6 +242,17 @@ static int ccu_mux_set_parent(struct clk_hw *hw, u8 index)
 	return ccu_mux_helper_set_parent(&cm->common, &cm->mux, index);
 }
 
+static int ccu_mux_determine_rate(struct clk_hw *hw,
+				  struct clk_rate_request *req)
+{
+	struct ccu_mux *cm = hw_to_ccu_mux(hw);
+
+	if (cm->common.features & CCU_FEATURE_CLOSEST_RATE)
+		return clk_mux_determine_rate_flags(hw, req, CLK_MUX_ROUND_CLOSEST);
+
+	return clk_mux_determine_rate_flags(hw, req, 0);
+}
+
 static unsigned long ccu_mux_recalc_rate(struct clk_hw *hw,
 					 unsigned long parent_rate)
 {
@@ -259,7 +270,7 @@ const struct clk_ops ccu_mux_ops = {
 	.get_parent	= ccu_mux_get_parent,
 	.set_parent	= ccu_mux_set_parent,
 
-	.determine_rate	= __clk_mux_determine_rate,
+	.determine_rate	= ccu_mux_determine_rate,
 	.recalc_rate	= ccu_mux_recalc_rate,
 };
 EXPORT_SYMBOL_NS_GPL(ccu_mux_ops, SUNXI_CCU);

drivers/clk/sunxi-ng/ccu_mux.h

@@ -46,20 +46,36 @@ struct ccu_mux {
 	struct ccu_common	common;
 };
 
+#define SUNXI_CCU_MUX_TABLE_WITH_GATE_FEAT(_struct, _name, _parents, _table,	\
+				     _reg, _shift, _width, _gate,		\
+				     _flags, _features)				\
+	struct ccu_mux _struct = {						\
+		.enable	= _gate,						\
+		.mux	= _SUNXI_CCU_MUX_TABLE(_shift, _width, _table),		\
+		.common	= {							\
+			.reg		= _reg,					\
+			.hw.init	= CLK_HW_INIT_PARENTS(_name,		\
+							      _parents,		\
+							      &ccu_mux_ops,	\
+							      _flags),		\
+			.features	= _features,				\
+		}								\
+	}
+
+#define SUNXI_CCU_MUX_TABLE_WITH_GATE_CLOSEST(_struct, _name, _parents,	\
+					      _table, _reg, _shift,	\
+					      _width, _gate, _flags)	\
+	SUNXI_CCU_MUX_TABLE_WITH_GATE_FEAT(_struct, _name, _parents,	\
+					   _table, _reg, _shift,	\
+					   _width, _gate, _flags,	\
+					   CCU_FEATURE_CLOSEST_RATE)
+
 #define SUNXI_CCU_MUX_TABLE_WITH_GATE(_struct, _name, _parents, _table,	\
 				     _reg, _shift, _width, _gate,	\
 				     _flags)				\
-	struct ccu_mux _struct = {					\
-		.enable	= _gate,					\
-		.mux	= _SUNXI_CCU_MUX_TABLE(_shift, _width, _table),	\
-		.common	= {						\
-			.reg		= _reg,				\
-			.hw.init	= CLK_HW_INIT_PARENTS(_name,	\
-							      _parents, \
-							      &ccu_mux_ops, \
-							      _flags),	\
-		}							\
-	}
+	SUNXI_CCU_MUX_TABLE_WITH_GATE_FEAT(_struct, _name, _parents,	\
+					   _table, _reg, _shift,	\
+					   _width, _gate, _flags, 0)
 
 #define SUNXI_CCU_MUX_WITH_GATE(_struct, _name, _parents, _reg,		\
 				_shift, _width, _gate, _flags)		\