dma: coh901318: add devicetree support

This adds support for probing the COH 901 318 DMA controller
and channels from the device tree.

Contains portions of a sketch patch from Arnd Bergmann.

Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/dma/ste-coh901318.txt b/Documentation/devicetree/bindings/dma/ste-coh901318.txt
new file mode 100644
index 000000000000..091ad057e9cf
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/ste-coh901318.txt
@@ -0,0 +1,32 @@
+ST-Ericsson COH 901 318 DMA Controller
+
+This is a DMA controller which has begun as a fork of the
+ARM PL08x PrimeCell VHDL code.
+
+Required properties:
+- compatible: should be "stericsson,coh901318"
+- reg: register locations and length
+- interrupts: the single DMA IRQ
+- #dma-cells: must be set to <1>, as the channels on the
+  COH 901 318 are simple and identified by a single number
+- dma-channels: the number of DMA channels handled
+
+Example:
+
+dmac: dma-controller@c00020000 {
+        compatible = "stericsson,coh901318";
+        reg = <0xc0020000 0x1000>;
+        interrupt-parent = <&vica>;
+        interrupts = <2>;
+        #dma-cells = <1>;
+        dma-channels = <40>;
+};
+
+Consumers example:
+
+uart0: serial@c0013000 {
+        compatible = "...";
+        (...)
+        dmas = <&dmac 17 &dmac 18>;
+        dma-names = "tx", "rx";
+};