clk: renesas: cpg-mssr: Add r8a774a1 support

Add RZ/G2M (R8A774A1) Clock Pulse Generator / Module Standby and Software
Reset support.

Based on the Table 8.2b of "RZ/G Series, 2nd Generation User's Manual:
Hardware ((Rev. 0.61, June 12, 2018)".
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/clock/renesas,cpg-mssr.txt

@@ -16,6 +16,7 @@ Required Properties:
       - "renesas,r8a7743-cpg-mssr" for the r8a7743 SoC (RZ/G1M)
       - "renesas,r8a7745-cpg-mssr" for the r8a7745 SoC (RZ/G1E)
       - "renesas,r8a77470-cpg-mssr" for the r8a77470 SoC (RZ/G1C)
+      - "renesas,r8a774a1-cpg-mssr" for the r8a774a1 SoC (RZ/G2M)
       - "renesas,r8a7790-cpg-mssr" for the r8a7790 SoC (R-Car H2)
       - "renesas,r8a7791-cpg-mssr" for the r8a7791 SoC (R-Car M2-W)
       - "renesas,r8a7792-cpg-mssr" for the r8a7792 SoC (R-Car V2H)
@@ -35,10 +36,10 @@ Required Properties:
   - clocks: References to external parent clocks, one entry for each entry in
     clock-names
   - clock-names: List of external parent clock names. Valid names are:
-      - "extal" (r8a7743, r8a7745, r8a77470, r8a7790, r8a7791, r8a7792,
-		 r8a7793, r8a7794, r8a7795, r8a7796, r8a77965, r8a77970,
-		 r8a77980, r8a77990, r8a77995)
-      - "extalr" (r8a7795, r8a7796, r8a77965, r8a77970, r8a77980)
+      - "extal" (r8a7743, r8a7745, r8a77470, r8a774a1, r8a7790, r8a7791,
+		 r8a7792, r8a7793, r8a7794, r8a7795, r8a7796, r8a77965,
+		 r8a77970, r8a77980, r8a77990, r8a77995)
+      - "extalr" (r8a774a1, r8a7795, r8a7796, r8a77965, r8a77970, r8a77980)
       - "usb_extal" (r8a7743, r8a7745, r8a77470, r8a7790, r8a7791, r8a7793,
 		     r8a7794)
 

drivers/clk/renesas/Kconfig

@@ -8,6 +8,7 @@ config CLK_RENESAS
 	select CLK_R8A7743 if ARCH_R8A7743
 	select CLK_R8A7745 if ARCH_R8A7745
 	select CLK_R8A77470 if ARCH_R8A77470
+	select CLK_R8A774A1 if ARCH_R8A774A1
 	select CLK_R8A7778 if ARCH_R8A7778
 	select CLK_R8A7779 if ARCH_R8A7779
 	select CLK_R8A7790 if ARCH_R8A7790
@@ -67,6 +68,10 @@ config CLK_R8A77470
 	bool "RZ/G1C clock support" if COMPILE_TEST
 	select CLK_RCAR_GEN2_CPG
 
+config CLK_R8A774A1
+	bool "RZ/G2M clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
 config CLK_R8A7778
 	bool "R-Car M1A clock support" if COMPILE_TEST
 	select CLK_RENESAS_CPG_MSTP

drivers/clk/renesas/Makefile

@@ -7,6 +7,7 @@ obj-$(CONFIG_CLK_R8A7740)		+= clk-r8a7740.o
 obj-$(CONFIG_CLK_R8A7743)		+= r8a7743-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A7745)		+= r8a7745-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A77470)		+= r8a77470-cpg-mssr.o
+obj-$(CONFIG_CLK_R8A774A1)		+= r8a774a1-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A7778)		+= clk-r8a7778.o
 obj-$(CONFIG_CLK_R8A7779)		+= clk-r8a7779.o
 obj-$(CONFIG_CLK_R8A7790)		+= r8a7790-cpg-mssr.o

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

@@ -664,6 +664,12 @@ static const struct of_device_id cpg_mssr_match[] = {
 		.data = &r8a77470_cpg_mssr_info,
 	},
 #endif
+#ifdef CONFIG_CLK_R8A774A1
+	{
+		.compatible = "renesas,r8a774a1-cpg-mssr",
+		.data = &r8a774a1_cpg_mssr_info,
+	},
+#endif
 #ifdef CONFIG_CLK_R8A7790
 	{
 		.compatible = "renesas,r8a7790-cpg-mssr",

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

@@ -137,6 +137,7 @@ struct cpg_mssr_info {
 extern const struct cpg_mssr_info r8a7743_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a7745_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a77470_cpg_mssr_info;
+extern const struct cpg_mssr_info r8a774a1_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a7790_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a7791_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a7792_cpg_mssr_info;