clk: renesas: r8a774b1: Add RPC clocks

Describe the RPCSRC internal clock and the RPC[D2] clocks derived from it,
as well as the RPC-IF module clock, in the RZ/G2N (R8A774B1) CPG/MSSR
driver.

Inspired by commit 94e3935b ("clk: renesas: r8a77980: Add RPC clocks").
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20201016121709.8447-4-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/clk/renesas/r8a774b1-cpg-mssr.c

@@ -40,6 +40,7 @@ enum clk_ids {
 	CLK_S2,
 	CLK_S3,
 	CLK_SDSRC,
+	CLK_RPCSRC,
 	CLK_RINT,
 
 	/* Module Clocks */
@@ -65,6 +66,12 @@ static const struct cpg_core_clk r8a774b1_core_clks[] __initconst = {
 	DEF_FIXED(".s2",        CLK_S2,            CLK_PLL1_DIV2,  4, 1),
 	DEF_FIXED(".s3",        CLK_S3,            CLK_PLL1_DIV2,  6, 1),
 	DEF_FIXED(".sdsrc",     CLK_SDSRC,         CLK_PLL1_DIV2,  2, 1),
+	DEF_BASE(".rpcsrc",     CLK_RPCSRC, CLK_TYPE_GEN3_RPCSRC, CLK_PLL1),
+
+	DEF_BASE("rpc",         R8A774B1_CLK_RPC, CLK_TYPE_GEN3_RPC,
+		 CLK_RPCSRC),
+	DEF_BASE("rpcd2",       R8A774B1_CLK_RPCD2, CLK_TYPE_GEN3_RPCD2,
+		 R8A774B1_CLK_RPC),
 
 	DEF_GEN3_OSC(".r",      CLK_RINT,          CLK_EXTAL,      32),
 
@@ -196,6 +203,7 @@ static const struct mssr_mod_clk r8a774b1_mod_clks[] __initconst = {
 	DEF_MOD("can-fd",		 914,	R8A774B1_CLK_S3D2),
 	DEF_MOD("can-if1",		 915,	R8A774B1_CLK_S3D4),
 	DEF_MOD("can-if0",		 916,	R8A774B1_CLK_S3D4),
+	DEF_MOD("rpc-if",		 917,	R8A774B1_CLK_RPCD2),
 	DEF_MOD("i2c6",			 918,	R8A774B1_CLK_S0D6),
 	DEF_MOD("i2c5",			 919,	R8A774B1_CLK_S0D6),
 	DEF_MOD("i2c-dvfs",		 926,	R8A774B1_CLK_CP),