linux-kernel - [PATCH 1/2] clk: renesas: rzv2h-cpg: Add support for static mux clocks

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Message-ID: <20250228202655.491035-2-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Fri, 28 Feb 2025 20:26:54 +0000
From: Prabhakar <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>
Cc: linux-renesas-soc@...r.kernel.org,
	linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH 1/2] clk: renesas: rzv2h-cpg: Add support for static mux clocks

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

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@...renesas.com>
---
 drivers/clk/renesas/rzv2h-cpg.c | 21 +++++++++++++++++++++
 drivers/clk/renesas/rzv2h-cpg.h | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/drivers/clk/renesas/rzv2h-cpg.c b/drivers/clk/renesas/rzv2h-cpg.c
index d7230a7e285c..6cda865c94fb 100644
--- a/drivers/clk/renesas/rzv2h-cpg.c
+++ b/drivers/clk/renesas/rzv2h-cpg.c
@@ -403,6 +403,24 @@ 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)
@@ -487,6 +505,9 @@ 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;
 	}
diff --git a/drivers/clk/renesas/rzv2h-cpg.h b/drivers/clk/renesas/rzv2h-cpg.h
index 3d3d4839d6d5..0ac2db805614 100644
--- a/drivers/clk/renesas/rzv2h-cpg.h
+++ b/drivers/clk/renesas/rzv2h-cpg.h
@@ -33,6 +33,26 @@ 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)
@@ -73,8 +93,12 @@ struct cpg_core_clk {
 	union {
 		unsigned int conf;
 		struct ddiv ddiv;
+		struct smuxed smux;
 	} cfg;
 	const struct clk_div_table *dtable;
+	const char * const *parent_names;
+	unsigned int num_parents;
+	u8 mux_flags;
 	u32 flag;
 };
 
@@ -84,6 +108,7 @@ enum clk_types {
 	CLK_TYPE_FF,		/* Fixed Factor Clock */
 	CLK_TYPE_PLL,
 	CLK_TYPE_DDIV,		/* Dynamic Switching Divider */
+	CLK_TYPE_SMUX,		/* Static Mux */
 };
 
 /* BIT(31) indicates if CLK1/2 are accessible or not */
@@ -105,6 +130,13 @@ 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
-- 
2.43.0