pinctrl: sh-pfc: add R8A7794 PFC support

Add PFC support for  the  R8A7794 SoC  including pin groups for some
on-chip devices such as ETH, I2C, INTC, MSIOF, QSPI, [H]SCIF...

Sergei: squashed together several patches, fixed the MLB_CLK typo,
added IRQ4.. IRQ9 pin groups, fixed IRQn comments, added ETH B pin
group names, removed stray new line and fixed typos in the  comments
in the pinmux_config_regs[] initializer, removed the platform device
ID, took into account limited number of signals in the GPIO1/5/6
controllers, added reasonable and removed unreasonable
copyrights, modified the bindings document, renamed, added changelog.

Changes in version 5:
- resolved rejects, refreshed the patch;
- added Laurent Pinchart's ACK.

Changes in version 4:
- reused the PORT_GP_26() macro to #define PORT_GP_28().

Changes in version 3:
- removed the platform device ID;
- added PORT_GP_26() and PORT_GP_28() macros, used them for GPIO1/5/6 in the
  CPU_ALL_PORT() macro.

Changes in version 2:
- rebased the patch.
Signed-off-by: Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt

@@ -18,6 +18,7 @@ Required Properties:
     - "renesas,pfc-r8a7790": for R8A7790 (R-Car H2) compatible pin-controller.
     - "renesas,pfc-r8a7791": for R8A7791 (R-Car M2-W) compatible pin-controller.
     - "renesas,pfc-r8a7793": for R8A7793 (R-Car M2-N) compatible pin-controller.
+    - "renesas,pfc-r8a7794": for R8A7794 (R-Car E2) compatible pin-controller.
     - "renesas,pfc-sh73a0": for SH73A0 (SH-Mobile AG5) compatible pin-controller.
 
   - reg: Base address and length of each memory resource used by the pin

drivers/pinctrl/sh-pfc/Kconfig

@@ -60,6 +60,11 @@ config PINCTRL_PFC_R8A7793
 	depends on ARCH_R8A7793
 	select PINCTRL_SH_PFC
 
+config PINCTRL_PFC_R8A7794
+	def_bool y
+	depends on ARCH_R8A7794
+	select PINCTRL_SH_PFC
+
 config PINCTRL_PFC_SH7203
 	def_bool y
 	depends on CPU_SUBTYPE_SH7203

drivers/pinctrl/sh-pfc/Makefile

@@ -11,6 +11,7 @@ obj-$(CONFIG_PINCTRL_PFC_R8A7779)	+= pfc-r8a7779.o
 obj-$(CONFIG_PINCTRL_PFC_R8A7790)	+= pfc-r8a7790.o
 obj-$(CONFIG_PINCTRL_PFC_R8A7791)	+= pfc-r8a7791.o
 obj-$(CONFIG_PINCTRL_PFC_R8A7793)	+= pfc-r8a7791.o
+obj-$(CONFIG_PINCTRL_PFC_R8A7794)	+= pfc-r8a7794.o
 obj-$(CONFIG_PINCTRL_PFC_SH7203)	+= pfc-sh7203.o
 obj-$(CONFIG_PINCTRL_PFC_SH7264)	+= pfc-sh7264.o
 obj-$(CONFIG_PINCTRL_PFC_SH7269)	+= pfc-sh7269.o

drivers/pinctrl/sh-pfc/core.c

@@ -487,6 +487,12 @@ static const struct of_device_id sh_pfc_of_table[] = {
 		.data = &r8a7793_pinmux_info,
 	},
 #endif
+#ifdef CONFIG_PINCTRL_PFC_R8A7794
+	{
+		.compatible = "renesas,pfc-r8a7794",
+		.data = &r8a7794_pinmux_info,
+	},
+#endif
 #ifdef CONFIG_PINCTRL_PFC_SH73A0
 	{
 		.compatible = "renesas,pfc-sh73a0",

drivers/pinctrl/sh-pfc/core.h

@@ -72,6 +72,7 @@ extern const struct sh_pfc_soc_info r8a7779_pinmux_info;
 extern const struct sh_pfc_soc_info r8a7790_pinmux_info;
 extern const struct sh_pfc_soc_info r8a7791_pinmux_info;
 extern const struct sh_pfc_soc_info r8a7793_pinmux_info;
+extern const struct sh_pfc_soc_info r8a7794_pinmux_info;
 extern const struct sh_pfc_soc_info sh7203_pinmux_info;
 extern const struct sh_pfc_soc_info sh7264_pinmux_info;
 extern const struct sh_pfc_soc_info sh7269_pinmux_info;