[2/2] clk: renesas: rzv2h-cpg: Add macro for defining static dividers

Commit Message

Lad, Prabhakar Feb. 28, 2025, 8:26 p.m. UTC

From: Lad Prabhakar <[e-mail]>

Unlike dynamic dividers, static dividers do not have a monitor bit.
Introduce the `DEF_CSDIV()` macro for defining static dividers, ensuring
consistency with existing dynamic divider macros.

Additionally, introduce the `CSDIV_NO_MON` macro to indicate the absence
of a monitor bit, allowing the monitoring step to be skipped when
`mon` is set to `CSDIV_NO_MON`.

Note, `rzv2h_cpg_ddiv_clk_register()` will be re-used instead of generic
`clk_hw_register_divider_table()` for registering satic dividers
as some of the static dividers require RMW operations.

Signed-off-by: Lad Prabhakar <[e-mail]>
---
 drivers/clk/renesas/rzv2h-cpg.c |  3 +++
 drivers/clk/renesas/rzv2h-cpg.h | 10 ++++++++++
 2 files changed, 13 insertions(+)

Patch

diff --git a/drivers/clk/renesas/rzv2h-cpg.c b/drivers/clk/renesas/rzv2h-cpg.c
index 6cda865c94fb..60d49ff2f8d3 100644
--- a/drivers/clk/renesas/rzv2h-cpg.c
+++ b/drivers/clk/renesas/rzv2h-cpg.c
@@ -302,6 +302,9 @@  static inline int rzv2h_cpg_wait_ddiv_clk_update_done(void __iomem *base, u8 mon
 	u32 bitmask = BIT(mon);
 	u32 val;
 
+	if (mon == CSDIV_NO_MON)
+		return 0;
+
 	return readl_poll_timeout_atomic(base + CPG_CLKSTATUS0, val, !(val & bitmask), 10, 200);
 }
 
diff --git a/drivers/clk/renesas/rzv2h-cpg.h b/drivers/clk/renesas/rzv2h-cpg.h
index 0ac2db805614..ed7036073b0c 100644
--- a/drivers/clk/renesas/rzv2h-cpg.h
+++ b/drivers/clk/renesas/rzv2h-cpg.h
@@ -25,6 +25,14 @@  struct ddiv {
 	unsigned int monbit:5;
 };
 
+/*
+ * On RZ/V2H(P), the dynamic divider clock supports up to 19 monitor bits,
+ * while on RZ/G3E, it supports up to 16 monitor bits. Use the maximum value
+ * `0x1f` to indicate that monitor bits are not supported for static divider
+ * clocks.
+ */
+#define CSDIV_NO_MON	(0x1f)
+
 #define DDIV_PACK(_offset, _shift, _width, _monbit) \
 	((struct ddiv){ \
 		.offset = _offset, \
@@ -130,6 +138,8 @@  enum clk_types {
 		.parent = _parent, \
 		.dtable = _dtable, \
 		.flag = CLK_DIVIDER_HIWORD_MASK)
+#define DEF_CSDIV(_name, _id, _parent, _ddiv_packed, _dtable) \
+	DEF_DDIV(_name, _id, _parent, _ddiv_packed, _dtable)
 #define DEF_SMUX(_name, _id, _smux_packed, _parent_names) \
 	DEF_TYPE(_name, _id, CLK_TYPE_SMUX, \
 		 .cfg.smux = _smux_packed, \