spi: omap2-mcspi: add generic DMA request support to the DT binding

The binding definition is based on the generic DMA request binding

Signed-off-by: Matt Porter <mporter@ti.com>
Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 26 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/spi/omap-spi.txt b/Documentation/devicetree/bindings/spi/omap-spi.txt
index 938809c6829b..4c85c4c69584 100644
--- a/Documentation/devicetree/bindings/spi/omap-spi.txt
+++ b/Documentation/devicetree/bindings/spi/omap-spi.txt
@@ -10,7 +10,18 @@ Required properties:
                           input. The default is D0 as input and
                           D1 as output.
 
-Example:
+Optional properties:
+- dmas: List of DMA specifiers with the controller specific format
+        as described in the generic DMA client binding. A tx and rx
+        specifier is required for each chip select.
+- dma-names: List of DMA request names. These strings correspond
+        1:1 with the DMA specifiers listed in dmas. The string naming
+        is to be "rxN" and "txN" for RX and TX requests,
+        respectively, where N equals the chip select number.
+
+Examples:
+
+[hwmod populated DMA resources]
 
 mcspi1: mcspi@1 {
     #address-cells = <1>;
@@ -20,3 +31,17 @@ mcspi1: mcspi@1 {
     ti,spi-num-cs = <4>;
 };
 
+[generic DMA request binding]
+
+mcspi1: mcspi@1 {
+    #address-cells = <1>;
+    #size-cells = <0>;
+    compatible = "ti,omap4-mcspi";
+    ti,hwmods = "mcspi1";
+    ti,spi-num-cs = <2>;
+    dmas = <&edma 42
+            &edma 43
+            &edma 44
+            &edma 45>;
+    dma-names = "tx0", "rx0", "tx1", "rx1";
+};