clk: renesas: cpg-mssr: Add support for R-Car E3

Initial support for R-Car E3 (r8a77990), including core and module
clocks.

Based on the Table 8.2g of "R-Car Series, 3rd Generation User's Manual:
Hardware ((Rev. 0.80, Oct 31, 2017) with Manual Errata on Feb. 28, 2018".

Inspried by patches by Takeshi Kihara in the BSP.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

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

@@ -26,6 +26,7 @@ Required Properties:
       - "renesas,r8a77965-cpg-mssr" for the r8a77965 SoC (R-Car M3-N)
       - "renesas,r8a77970-cpg-mssr" for the r8a77970 SoC (R-Car V3M)
       - "renesas,r8a77980-cpg-mssr" for the r8a77980 SoC (R-Car V3H)
+      - "renesas,r8a77990-cpg-mssr" for the r8a77990 SoC (R-Car E3)
       - "renesas,r8a77995-cpg-mssr" for the r8a77995 SoC (R-Car D3)
 
   - reg: Base address and length of the memory resource used by the CPG/MSSR
@@ -36,7 +37,7 @@ Required Properties:
   - 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, r8a77995)
+		 r8a77980, r8a77990, r8a77995)
       - "extalr" (r8a7795, r8a7796, r8a77965, r8a77970, r8a77980)
       - "usb_extal" (r8a7743, r8a7745, r8a77470, r8a7790, r8a7791, r8a7793,
 		     r8a7794)

drivers/clk/renesas/Kconfig

@@ -19,6 +19,7 @@ config CLK_RENESAS
 	select CLK_R8A77965 if ARCH_R8A77965
 	select CLK_R8A77970 if ARCH_R8A77970
 	select CLK_R8A77980 if ARCH_R8A77980
+	select CLK_R8A77990 if ARCH_R8A77990
 	select CLK_R8A77995 if ARCH_R8A77995
 	select CLK_SH73A0 if ARCH_SH73A0
 
@@ -116,6 +117,10 @@ config CLK_R8A77980
 	bool "R-Car V3H clock support" if COMPILE_TEST
 	select CLK_RCAR_GEN3_CPG
 
+config CLK_R8A77990
+	bool "R-Car E3 clock support" if COMPILE_TEST
+	select CLK_RCAR_GEN3_CPG
+
 config CLK_R8A77995
 	bool "R-Car D3 clock support" if COMPILE_TEST
 	select CLK_RCAR_GEN3_CPG

drivers/clk/renesas/Makefile

@@ -18,6 +18,7 @@ obj-$(CONFIG_CLK_R8A7796)		+= r8a7796-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A77965)		+= r8a77965-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A77970)		+= r8a77970-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A77980)		+= r8a77980-cpg-mssr.o
+obj-$(CONFIG_CLK_R8A77990)		+= r8a77990-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A77995)		+= r8a77995-cpg-mssr.o
 obj-$(CONFIG_CLK_SH73A0)		+= clk-sh73a0.o
 

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

@@ -717,6 +717,12 @@ static const struct of_device_id cpg_mssr_match[] = {
 		.data = &r8a77980_cpg_mssr_info,
 	},
 #endif
+#ifdef CONFIG_CLK_R8A77990
+	{
+		.compatible = "renesas,r8a77990-cpg-mssr",
+		.data = &r8a77990_cpg_mssr_info,
+	},
+#endif
 #ifdef CONFIG_CLK_R8A77995
 	{
 		.compatible = "renesas,r8a77995-cpg-mssr",

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

@@ -143,6 +143,7 @@ extern const struct cpg_mssr_info r8a7796_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a77965_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a77970_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a77980_cpg_mssr_info;
+extern const struct cpg_mssr_info r8a77990_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a77995_cpg_mssr_info;