From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
Add support for static dividers that do not require read-modify-write (RMW)
operations. This enables the use of the generic clk_divider_ops instead of
the custom RMW-based implementation.
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
Co-developed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
drivers/clk/renesas/rzv2h-cpg.c | 5 ++++-
drivers/clk/renesas/rzv2h-cpg.h | 12 ++++++++++++
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/renesas/rzv2h-cpg.c b/drivers/clk/renesas/rzv2h-cpg.c
index 4123c30e8663..e53cd31c218e 100644
--- a/drivers/clk/renesas/rzv2h-cpg.c
+++ b/drivers/clk/renesas/rzv2h-cpg.c
@@ -380,7 +380,10 @@ rzv2h_cpg_ddiv_clk_register(const struct cpg_core_clk *core,
return ERR_PTR(-ENOMEM);
init.name = core->name;
- init.ops = &rzv2h_ddiv_clk_divider_ops;
+ if (cfg_ddiv.no_rmw)
+ init.ops = &clk_divider_ops;
+ else
+ init.ops = &rzv2h_ddiv_clk_divider_ops;
init.parent_names = &parent_name;
init.num_parents = 1;
diff --git a/drivers/clk/renesas/rzv2h-cpg.h b/drivers/clk/renesas/rzv2h-cpg.h
index 00b52b459aad..97054f207113 100644
--- a/drivers/clk/renesas/rzv2h-cpg.h
+++ b/drivers/clk/renesas/rzv2h-cpg.h
@@ -37,12 +37,15 @@ struct pll {
* @shift: position of the divider bit
* @width: width of the divider
* @monbit: monitor bit in CPG_CLKSTATUS0 register
+ * @no_rmw: flag to indicate if the register is read-modify-write
+ * (1: no RMW, 0: RMW)
*/
struct ddiv {
unsigned int offset:11;
unsigned int shift:4;
unsigned int width:4;
unsigned int monbit:5;
+ unsigned int no_rmw:1;
};
/*
@@ -61,6 +64,15 @@ struct ddiv {
.monbit = _monbit \
})
+#define DDIV_PACK_NO_RMW(_offset, _shift, _width, _monbit) \
+ ((struct ddiv){ \
+ .offset = (_offset), \
+ .shift = (_shift), \
+ .width = (_width), \
+ .monbit = (_monbit), \
+ .no_rmw = 1 \
+ })
+
/**
* struct smuxed - Structure for static muxed clocks
*
--
2.49.0
