dmaengine: usb-dmac: Document SoC specific compatibility strings

In general Renesas hardware is not documented to the extent where the
relationship between IP blocks on different SoCs can be assumed although
they may appear to operate the same way. Furthermore the documentation
typically does not specify a version for individual IP blocks. For these
reasons a convention of using the SoC name in place of a version and
providing SoC-specific compatibility strings has been adopted.

Although not universally liked this convention is used in the bindings for
most drivers for Renesas hardware. The purpose of this patch is to
update the Renesas USB DMA Controller driver to follow this convention.

Cc: devicetree@vger.kernel.org
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt

 * Renesas USB DMA Controller Device Tree bindings
 
 Required Properties:
-- compatible: must contain "renesas,usb-dmac"
+-compatible: "renesas,<soctype>-usb-dmac", "renesas,usb-dmac" as fallback.
+	Examples with soctypes are:
+	  - "renesas,r8a7790-usb-dmac" (R-Car H2)
+	  - "renesas,r8a7791-usb-dmac" (R-Car M2-W)
+	  - "renesas,r8a7793-usb-dmac" (R-Car M2-N)
+	  - "renesas,r8a7794-usb-dmac" (R-Car E2)
+	  - "renesas,r8a7795-usb-dmac" (R-Car H3)
 - reg: base address and length of the registers block for the DMAC
 - interrupts: interrupt specifiers for the DMAC, one for each entry in
   interrupt-names.
@@ -15,7 +21,7 @@ Required Properties:
 Example: R8A7790 (R-Car H2) USB-DMACs
 
 	usb_dmac0: dma-controller@e65a0000 {
-		compatible = "renesas,usb-dmac";
+		compatible = "renesas,r8a7790-usb-dmac", "renesas,usb-dmac";
 		reg = <0 0xe65a0000 0 0x100>;
 		interrupts = <0 109 IRQ_TYPE_LEVEL_HIGH
 			      0 109 IRQ_TYPE_LEVEL_HIGH>;