From b006e40963c5db79fca7134cdfced643e095f64c Mon Sep 17 00:00:00 2001
From: Kaustabh Chakraborty <kauschluss@disroot.org>
Date: Fri, 17 Oct 2025 20:51:30 +0530
Subject: [PATCH] clk: exynos: add support for fixed rate and fixed factor
 clocks

Add register functions for fixed rate and fixed factor clock drivers.
The vendor-specific structs defined are borrowed from the CCF driver
found in the Linux kernel.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
---
 drivers/clk/exynos/clk.c | 43 +++++++++++++++++++++++++++++++++++
 drivers/clk/exynos/clk.h | 49 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 92 insertions(+)

diff --git a/drivers/clk/exynos/clk.c b/drivers/clk/exynos/clk.c
index 2f5a3de6563..a3832981f90 100644
--- a/drivers/clk/exynos/clk.c
+++ b/drivers/clk/exynos/clk.c
@@ -10,6 +10,47 @@
 #include <dm.h>
 #include "clk.h"
 
+static void
+samsung_clk_register_fixed_rate(struct udevice *dev, void __iomem *base,
+				unsigned int cmu_id,
+				const struct samsung_fixed_rate_clock *clk_list,
+				unsigned int nr_clk)
+{
+	unsigned int cnt;
+
+	for (cnt = 0; cnt < nr_clk; cnt++) {
+		struct clk *clk;
+		const struct samsung_fixed_rate_clock *m;
+		unsigned long clk_id;
+
+		m = &clk_list[cnt];
+		clk = clk_register_fixed_rate(NULL, m->name, m->fixed_rate);
+		clk_id = SAMSUNG_TO_CLK_ID(cmu_id, m->id);
+		clk_dm(clk_id, clk);
+	}
+}
+
+static void
+samsung_clk_register_fixed_factor(struct udevice *dev, void __iomem *base,
+				  unsigned int cmu_id,
+				  const struct samsung_fixed_factor_clock *clk_list,
+				  unsigned int nr_clk)
+{
+	unsigned int cnt;
+
+	for (cnt = 0; cnt < nr_clk; cnt++) {
+		struct clk *clk;
+		const struct samsung_fixed_factor_clock *m;
+		unsigned long clk_id;
+
+		m = &clk_list[cnt];
+		clk = clk_register_fixed_factor(dev, m->name, m->parent_name,
+						m->flags, m->mult, m->div);
+		clk_id = SAMSUNG_TO_CLK_ID(cmu_id, m->id);
+		clk_dm(clk_id, clk);
+	}
+}
+
 static void samsung_clk_register_mux(struct udevice *dev, void __iomem *base,
 				     unsigned int cmu_id,
 				     const struct samsung_mux_clock *clk_list,
@@ -79,6 +120,8 @@ typedef void (*samsung_clk_register_fn)(struct udevice *dev, void __iomem *base,
 					unsigned int nr_clk);
 
 static const samsung_clk_register_fn samsung_clk_register_fns[] = {
+	[S_CLK_FRATE]	= (samsung_clk_register_fn)samsung_clk_register_fixed_rate,
+	[S_CLK_FFACTOR]	= (samsung_clk_register_fn)samsung_clk_register_fixed_factor,
 	[S_CLK_MUX]	= (samsung_clk_register_fn)samsung_clk_register_mux,
 	[S_CLK_DIV]	= (samsung_clk_register_fn)samsung_clk_register_div,
 	[S_CLK_GATE]	= (samsung_clk_register_fn)samsung_clk_register_gate,
diff --git a/drivers/clk/exynos/clk.h b/drivers/clk/exynos/clk.h
index ed0a395f0f6..e53dcc6a821 100644
--- a/drivers/clk/exynos/clk.h
+++ b/drivers/clk/exynos/clk.h
@@ -58,6 +58,53 @@ static const struct clk_ops _name##_clk_ops = {				\
  */
 #define SAMSUNG_TO_CLK_ID(_cmu, _id)	(((_cmu) << 8) | ((_id) & 0xff))
 
+/**
+ * struct samsung_fixed_rate_clock - information about fixed-rate clock
+ * @id: platform specific id of the clock
+ * @name: name of this fixed-rate clock
+ * @fixed_rate: fixed clock rate of this clock
+ */
+struct samsung_fixed_rate_clock {
+	unsigned int		id;
+	const char		*name;
+	unsigned long		fixed_rate;
+};
+
+#define FRATE(_id, cname, frate)			\
+	{						\
+		.id		= _id,			\
+		.name		= cname,		\
+		.fixed_rate	= frate,		\
+	}
+
+/**
+ * struct samsung_fixed_factor_clock - information about fixed-factor clock
+ * @id: platform specific id of the clock
+ * @name: name of this fixed-factor clock
+ * @parent_name: parent clock name
+ * @mult: fixed multiplication factor
+ * @div: fixed division factor
+ * @flags: optional fixed-factor clock flags
+ */
+struct samsung_fixed_factor_clock {
+	unsigned int		id;
+	const char		*name;
+	const char		*parent_name;
+	unsigned long		mult;
+	unsigned long		div;
+	unsigned long		flags;
+};
+
+#define FFACTOR(_id, cname, pname, m, d, f)		\
+	{						\
+		.id		= _id,			\
+		.name		= cname,		\
+		.parent_name	= pname,		\
+		.mult		= m,			\
+		.div		= d,			\
+		.flags		= f,			\
+	}
+
 /**
  * struct samsung_mux_clock - information about mux clock
  * @id: platform specific id of the clock
@@ -206,6 +253,8 @@ struct samsung_pll_clock {
 	}
 
 enum samsung_clock_type {
+	S_CLK_FRATE,
+	S_CLK_FFACTOR,
 	S_CLK_MUX,
 	S_CLK_DIV,
 	S_CLK_GATE,
-- 
2.47.3