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

The Renesas RZ/T2H (R9A09G077) and RZ/N2H (R9A09G087) SoCs have a CANFD
peripheral which has three input clocks PCLKM (peripheral clock),
PCLKH (RAM clock) and PCLKCAN (CANFD clock).

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/clk/renesas/r9a09g077-cpg.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/renesas/r9a09g077-cpg.c b/drivers/clk/renesas/r9a09g077-cpg.c
index dee25cdadf1d..93b15e06a19b 100644
--- a/drivers/clk/renesas/r9a09g077-cpg.c
+++ b/drivers/clk/renesas/r9a09g077-cpg.c
@@ -47,6 +47,7 @@
 #define FSELXSPI1	CONF_PACK(SCKCR, 8, 3)
 #define DIVSEL_XSPI0	CONF_PACK(SCKCR, 6, 1)
 #define DIVSEL_XSPI1	CONF_PACK(SCKCR, 14, 1)
+#define FSELCANFD	CONF_PACK(SCKCR, 20, 1)
 #define SEL_PLL		CONF_PACK(SCKCR, 22, 1)
 
 #define DIVCA55C0	CONF_PACK(SCKCR2, 8, 1)
@@ -85,7 +86,7 @@ enum rzt2h_clk_types {
 
 enum clk_ids {
 	/* Core Clock Outputs exported to DT */
-	LAST_DT_CORE_CLK = R9A09G077_XSPI_CLK1,
+	LAST_DT_CORE_CLK = R9A09G077_PCLKCAN,
 
 	/* External Input Clocks */
 	CLK_EXTAL,
@@ -103,6 +104,9 @@ enum clk_ids {
 	CLK_PLL4D1,
 	CLK_PLL4D1_DIV3,
 	CLK_PLL4D1_DIV4,
+	CLK_PLL4D3,
+	CLK_PLL4D3_DIV10,
+	CLK_PLL4D3_DIV20,
 	CLK_SCI0ASYNC,
 	CLK_SCI1ASYNC,
 	CLK_SCI2ASYNC,
@@ -150,6 +154,7 @@ static const char * const sel_clk_pll1[] = { ".loco", ".pll1" };
 static const char * const sel_clk_pll2[] = { ".loco", ".pll2" };
 static const char * const sel_clk_pll4[] = { ".loco", ".pll4" };
 static const char * const sel_clk_pll4d1_div3_div4[] = { ".pll4d1_div3", ".pll4d1_div4" };
+static const char * const sel_clk_pll4d3_div10_div20[] = { ".pll4d3_div10", ".pll4d3_div20" };
 
 static const struct cpg_core_clk r9a09g077_core_clks[] __initconst = {
 	/* External Clock Inputs */
@@ -174,6 +179,9 @@ static const struct cpg_core_clk r9a09g077_core_clks[] __initconst = {
 	DEF_FIXED(".pll4d1", CLK_PLL4D1, CLK_SEL_CLK_PLL4, 1, 1),
 	DEF_FIXED(".pll4d1_div3", CLK_PLL4D1_DIV3, CLK_PLL4D1, 3, 1),
 	DEF_FIXED(".pll4d1_div4", CLK_PLL4D1_DIV4, CLK_PLL4D1, 4, 1),
+	DEF_FIXED(".pll4d3", CLK_PLL4D3, CLK_SEL_CLK_PLL4, 3, 1),
+	DEF_FIXED(".pll4d3_div10", CLK_PLL4D3_DIV10, CLK_PLL4D3, 10, 1),
+	DEF_FIXED(".pll4d3_div20", CLK_PLL4D3_DIV20, CLK_PLL4D3, 20, 1),
 
 	DEF_DIV(".sci0async", CLK_SCI0ASYNC, CLK_PLL4D1, DIVSCI0ASYNC,
 		dtable_24_25_30_32),
@@ -232,6 +240,8 @@ static const struct cpg_core_clk r9a09g077_core_clks[] __initconst = {
 			 FSELXSPI0, dtable_6_8_16_32_64),
 	DEF_DIV_FSELXSPI("XSPI_CLK1", R9A09G077_XSPI_CLK1, CLK_DIVSELXSPI1_SCKCR,
 			 FSELXSPI1, dtable_6_8_16_32_64),
+	DEF_MUX("PCLKCAN", R9A09G077_PCLKCAN, FSELCANFD,
+		sel_clk_pll4d3_div10_div20, ARRAY_SIZE(sel_clk_pll4d3_div10_div20), 0),
 };
 
 static const struct mssr_mod_clk r9a09g077_mod_clks[] __initconst = {
@@ -251,6 +261,7 @@ static const struct mssr_mod_clk r9a09g077_mod_clks[] __initconst = {
 	DEF_MOD("adc1", 207, R9A09G077_CLK_PCLKH),
 	DEF_MOD("adc2", 225, R9A09G077_CLK_PCLKM),
 	DEF_MOD("tsu", 307, R9A09G077_CLK_PCLKL),
+	DEF_MOD("canfd", 310, R9A09G077_CLK_PCLKM),
 	DEF_MOD("gmac0", 400, R9A09G077_CLK_PCLKM),
 	DEF_MOD("ethsw", 401, R9A09G077_CLK_PCLKM),
 	DEF_MOD("ethss", 403, R9A09G077_CLK_PCLKM),
-- 
2.52.0

Hi Prabhakar,

On Wed, 24 Dec 2025 at 17:51, Prabhakar <prabhakar.csengg@gmail.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> The Renesas RZ/T2H (R9A09G077) and RZ/N2H (R9A09G087) SoCs have a CANFD
> peripheral which has three input clocks PCLKM (peripheral clock),
> PCLKH (RAM clock) and PCLKCAN (CANFD clock).
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Thanks for your patch!

> --- a/drivers/clk/renesas/r9a09g077-cpg.c
> +++ b/drivers/clk/renesas/r9a09g077-cpg.c

> @@ -251,6 +261,7 @@ static const struct mssr_mod_clk r9a09g077_mod_clks[] __initconst = {
>         DEF_MOD("adc1", 207, R9A09G077_CLK_PCLKH),
>         DEF_MOD("adc2", 225, R9A09G077_CLK_PCLKM),
>         DEF_MOD("tsu", 307, R9A09G077_CLK_PCLKL),
> +       DEF_MOD("canfd", 310, R9A09G077_CLK_PCLKM),

The documentation is a bit confusing (it states that PCLKCAN is the
peripheral module clock for CANFD), but after some more digging,
PCLKM seems to be correct here.

>         DEF_MOD("gmac0", 400, R9A09G077_CLK_PCLKM),
>         DEF_MOD("ethsw", 401, R9A09G077_CLK_PCLKM),
>         DEF_MOD("ethss", 403, R9A09G077_CLK_PCLKM),

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
i.e. will queue in renesas-clk for v6.20.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds