spi: rspi: Add support for new R-Car Gen2 SoCs

Add support for QSPI in:
  - r8a7792 (R-Car V2H)
  - r8a7793 (R-Car M2-N)
  - r8a7794 (R-Car E2)

r8a7791 is now called "R-Car M2-W".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>

Documentation/devicetree/bindings/spi/spi-rspi.txt

@@ -11,7 +11,10 @@ Required properties:
 		        - "renesas,rspi-sh7757" (SH)
 			- "renesas,rspi-r7s72100" (RZ/A1H)
 			- "renesas,qspi-r8a7790" (R-Car H2)
-			- "renesas,qspi-r8a7791" (R-Car M2)
+			- "renesas,qspi-r8a7791" (R-Car M2-W)
+			- "renesas,qspi-r8a7792" (R-Car V2H)
+			- "renesas,qspi-r8a7793" (R-Car M2-N)
+			- "renesas,qspi-r8a7794" (R-Car E2)
 - reg              : Address start and address range size of the device
 - interrupts       : A list of interrupt-specifiers, one for each entry in
 		     interrupt-names.

drivers/spi/spi-rspi.c

@@ -87,7 +87,7 @@
 /* RSPI on SH only */
 #define SPCR_TXMD		0x02	/* TX Only Mode (vs. Full Duplex) */
 #define SPCR_SPMS		0x01	/* 3-wire Mode (vs. 4-wire) */
-/* QSPI on R-Car M2 only */
+/* QSPI on R-Car Gen2 only */
 #define SPCR_WSWAP		0x02	/* Word Swap of read-data for DMAC */
 #define SPCR_BSWAP		0x01	/* Byte Swap of read-data for DMAC */