clk: renesas: rzv2h: Add support for static mux clocks

Add support for `CLK_TYPE_SMUX` to register static muxed clocks on the
Renesas RZ/V2H(P) SoC.  Extend `cpg_core_clk` to include parent names,
mux flags, and a new `smuxed` struct.  Update clock registration to
handle static mux clocks.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250407165202.197570-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/clk/renesas/rzv2h-cpg.c

@@ -393,6 +393,24 @@ rzv2h_cpg_ddiv_clk_register(const struct cpg_core_clk *core,
 	return div->hw.clk;
 }
 
+static struct clk * __init
+rzv2h_cpg_mux_clk_register(const struct cpg_core_clk *core,
+			   struct rzv2h_cpg_priv *priv)
+{
+	struct smuxed mux = core->cfg.smux;
+	const struct clk_hw *clk_hw;
+
+	clk_hw = devm_clk_hw_register_mux(priv->dev, core->name,
+					  core->parent_names, core->num_parents,
+					  core->flag, priv->base + mux.offset,
+					  mux.shift, mux.width,
+					  core->mux_flags, &priv->rmw_lock);
+	if (IS_ERR(clk_hw))
+		return ERR_CAST(clk_hw);
+
+	return clk_hw->clk;
+}
+
 static struct clk
 *rzv2h_cpg_clk_src_twocell_get(struct of_phandle_args *clkspec,
 			       void *data)
@@ -477,6 +495,9 @@ rzv2h_cpg_register_core_clk(const struct cpg_core_clk *core,
 	case CLK_TYPE_DDIV:
 		clk = rzv2h_cpg_ddiv_clk_register(core, priv);
 		break;
+	case CLK_TYPE_SMUX:
+		clk = rzv2h_cpg_mux_clk_register(core, priv);
+		break;
 	default:
 		goto fail;
 	}

drivers/clk/renesas/rzv2h-cpg.h

@@ -53,6 +53,26 @@ struct ddiv {
 		.monbit = _monbit \
 	})
 
+/**
+ * struct smuxed - Structure for static muxed clocks
+ *
+ * @offset: register offset
+ * @shift: position of the divider field
+ * @width: width of the divider field
+ */
+struct smuxed {
+	unsigned int offset:11;
+	unsigned int shift:4;
+	unsigned int width:4;
+};
+
+#define SMUX_PACK(_offset, _shift, _width) \
+	((struct smuxed){ \
+		.offset = (_offset), \
+		.shift = (_shift), \
+		.width = (_width), \
+	})
+
 #define CPG_CDDIV0		(0x400)
 #define CPG_CDDIV1		(0x404)
 #define CPG_CDDIV3		(0x40C)
@@ -96,8 +116,12 @@ struct cpg_core_clk {
 		unsigned int conf;
 		struct ddiv ddiv;
 		struct pll pll;
+		struct smuxed smux;
 	} cfg;
 	const struct clk_div_table *dtable;
+	const char * const *parent_names;
+	unsigned int num_parents;
+	u8 mux_flags;
 	u32 flag;
 };
 
@@ -107,6 +131,7 @@ enum clk_types {
 	CLK_TYPE_FF,		/* Fixed Factor Clock */
 	CLK_TYPE_PLL,
 	CLK_TYPE_DDIV,		/* Dynamic Switching Divider */
+	CLK_TYPE_SMUX,		/* Static Mux */
 };
 
 #define DEF_TYPE(_name, _id, _type...) \
@@ -125,6 +150,13 @@ enum clk_types {
 		.parent = _parent, \
 		.dtable = _dtable, \
 		.flag = CLK_DIVIDER_HIWORD_MASK)
+#define DEF_SMUX(_name, _id, _smux_packed, _parent_names) \
+	DEF_TYPE(_name, _id, CLK_TYPE_SMUX, \
+		 .cfg.smux = _smux_packed, \
+		 .parent_names = _parent_names, \
+		 .num_parents = ARRAY_SIZE(_parent_names), \
+		 .flag = CLK_SET_RATE_PARENT, \
+		 .mux_flags = CLK_MUX_HIWORD_MASK)
 
 /**
  * struct rzv2h_mod_clk - Module Clocks definitions