clk: renesas: rcar-gen3: Add support for mode pin clock selection

Make the existing support for selecting between clean and SSCG clocks
using MD12 more generic, to allow using other mode pins for arbitrary
clock selection.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>

drivers/clk/renesas/rcar-gen3-cpg.c

@@ -539,16 +539,14 @@ struct clk * __init rcar_gen3_cpg_clk_register(struct device *dev,
 			parent = clks[cpg_clk_extalr];
 		break;
 
-	case CLK_TYPE_GEN3_PE:
+	case CLK_TYPE_GEN3_MDSEL:
 		/*
-		 * Peripheral clock with a fixed divider, selectable between
-		 * clean and spread spectrum parents using MD12
+		 * Clock selectable between two parents and two fixed dividers
+		 * using a mode pin
 		 */
-		if (cpg_mode & BIT(12)) {
-			/* Clean */
+		if (cpg_mode & BIT(core->offset)) {
 			div = core->div & 0xffff;
 		} else {
-			/* SCCG */
 			parent = clks[core->parent >> 16];
 			if (IS_ERR(parent))
 				return ERR_CAST(parent);

drivers/clk/renesas/rcar-gen3-cpg.h

@@ -20,7 +20,7 @@ enum rcar_gen3_clk_types {
 	CLK_TYPE_GEN3_PLL4,
 	CLK_TYPE_GEN3_SD,
 	CLK_TYPE_GEN3_R,
-	CLK_TYPE_GEN3_PE,
+	CLK_TYPE_GEN3_MDSEL,	/* Select parent/divider using mode pin */
 	CLK_TYPE_GEN3_Z,
 	CLK_TYPE_GEN3_Z2,
 	CLK_TYPE_GEN3_OSC,	/* OSC EXTAL predivider and fixed divider */
@@ -30,11 +30,16 @@ enum rcar_gen3_clk_types {
 #define DEF_GEN3_SD(_name, _id, _parent, _offset)	\
 	DEF_BASE(_name, _id, CLK_TYPE_GEN3_SD, _parent, .offset = _offset)
 
+#define DEF_GEN3_MDSEL(_name, _id, _md, _parent0, _div0, _parent1, _div1) \
+	DEF_BASE(_name, _id, CLK_TYPE_GEN3_MDSEL,	\
+		 (_parent0) << 16 | (_parent1),		\
+		 .div = (_div0) << 16 | (_div1), .offset = _md)
+
 #define DEF_GEN3_PE(_name, _id, _parent_sscg, _div_sscg, _parent_clean, \
 		    _div_clean) \
-	DEF_BASE(_name, _id, CLK_TYPE_GEN3_PE,			\
-		 (_parent_sscg) << 16 | (_parent_clean),	\
-		 .div = (_div_sscg) << 16 | (_div_clean))
+	DEF_GEN3_MDSEL(_name, _id, 12, _parent_sscg, _div_sscg,	\
+		       _parent_clean, _div_clean)
+
 #define DEF_GEN3_OSC(_name, _id, _parent, _div)		\
 	DEF_BASE(_name, _id, CLK_TYPE_GEN3_OSC, _parent, .div = _div)