clk: renesas: Add CPG/MSSR support to RZ/N2H SoC

Add clock driver support for the Renesas RZ/N2H (R9A09G087) SoC by reusing
the existing RZ/T2H (R9A09G077) CPG/MSSR implementation, as both SoCs
share the same clock and reset architecture.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250617155757.149597-5-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/clk/renesas/Kconfig

@@ -44,6 +44,7 @@ config CLK_RENESAS
 	select CLK_R9A09G056 if ARCH_R9A09G056
 	select CLK_R9A09G057 if ARCH_R9A09G057
 	select CLK_R9A09G077 if ARCH_R9A09G077
+	select CLK_R9A09G087 if ARCH_R9A09G087
 	select CLK_SH73A0 if ARCH_SH73A0
 
 if CLK_RENESAS
@@ -213,6 +214,10 @@ config CLK_R9A09G077
 	bool "RZ/T2H clock support" if COMPILE_TEST
 	select CLK_RENESAS_CPG_MSSR
 
+config CLK_R9A09G087
+	bool "RZ/N2H clock support" if COMPILE_TEST
+	select CLK_RENESAS_CPG_MSSR
+
 config CLK_SH73A0
 	bool "SH-Mobile AG5 clock support" if COMPILE_TEST
 	select CLK_RENESAS_CPG_MSTP

drivers/clk/renesas/Makefile

@@ -41,6 +41,7 @@ obj-$(CONFIG_CLK_R9A09G047)		+= r9a09g047-cpg.o
 obj-$(CONFIG_CLK_R9A09G056)		+= r9a09g056-cpg.o
 obj-$(CONFIG_CLK_R9A09G057)		+= r9a09g057-cpg.o
 obj-$(CONFIG_CLK_R9A09G077)		+= r9a09g077-cpg.o
+obj-$(CONFIG_CLK_R9A09G087)		+= r9a09g077-cpg.o
 obj-$(CONFIG_CLK_SH73A0)		+= clk-sh73a0.o
 
 # Family

drivers/clk/renesas/r9a09g077-cpg.c

@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 
 #include <dt-bindings/clock/renesas,r9a09g077-cpg-mssr.h>
+#include <dt-bindings/clock/renesas,r9a09g087-cpg-mssr.h>
 #include "renesas-cpg-mssr.h"
 
 #define RZT2H_REG_BLOCK_SHIFT	11

drivers/clk/renesas/renesas-cpg-mssr.c

@@ -941,6 +941,12 @@ static const struct of_device_id cpg_mssr_match[] = {
 		.compatible = "renesas,r9a09g077-cpg-mssr",
 		.data = &r9a09g077_cpg_mssr_info,
 	},
+#endif
+#ifdef CONFIG_CLK_R9A09G087
+	{
+		.compatible = "renesas,r9a09g087-cpg-mssr",
+		.data = &r9a09g077_cpg_mssr_info,
+	},
 #endif
 	{ /* sentinel */ }
 };