dmaengine: renesas,usb-dmac: Add device tree bindings documentation

Document the device tree bindings for the Renesas USB DMA
Controller (USB-DMAC).

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt b/Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt
new file mode 100644 (file)
index 0000000..040f365
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt
@@ -0,0 +1,37 @@
+* Renesas USB DMA Controller Device Tree bindings
+
+Required Properties:
+- compatible: must contain "renesas,usb-dmac"
+- 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.
+- interrupt-names: one entry per channel, named "ch%u", where %u is the
+  channel number ranging from zero to the number of channels minus one.
+- clocks: a list of phandle + clock-specifier pairs.
+- #dma-cells: must be <1>, the cell specifies the channel number of the DMAC
+  port connected to the DMA client.
+- dma-channels: number of DMA channels
+
+Example: R8A7790 (R-Car H2) USB-DMACs
+
+       usb_dmac0: dma-controller@e65a0000 {
+               compatible = "renesas,usb-dmac";
+               reg = <0 0xe65a0000 0 0x100>;
+               interrupts = <0 109 IRQ_TYPE_LEVEL_HIGH
+                             0 109 IRQ_TYPE_LEVEL_HIGH>;
+               interrupt-names = "ch0", "ch1";
+               clocks = <&mstp3_clks R8A7790_CLK_USBDMAC0>;
+               #dma-cells = <1>;
+               dma-channels = <2>;
+       };
+
+       usb_dmac1: dma-controller@e65b0000 {
+               compatible = "renesas,usb-dmac";
+               reg = <0 0xe65b0000 0 0x100>;
+               interrupts = <0 110 IRQ_TYPE_LEVEL_HIGH
+                             0 110 IRQ_TYPE_LEVEL_HIGH>;
+               interrupt-names = "ch0", "ch1";
+               clocks = <&mstp3_clks R8A7790_CLK_USBDMAC1>;
+               #dma-cells = <1>;
+               dma-channels = <2>;
+       };