dt-bindings: dma: ti-edma: Document dma-channel-mask for EDMA

Similarly to paRAM slots, channels can be used by other cores.

The common dma-channel-mask property can be used for specifying the
available channels.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20191025073056.25450-3-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/Documentation/devicetree/bindings/dma/ti-edma.txt b/Documentation/devicetree/bindings/dma/ti-edma.txt
index 4bbc94d829c8aa8c54f13de98e7a526dc72c0eb6..0e1398f93aa235c658854a08cf330ce1c8989d9c 100644 (file)
--- a/Documentation/devicetree/bindings/dma/ti-edma.txt
+++ b/Documentation/devicetree/bindings/dma/ti-edma.txt
@@ -42,6 +42,11 @@ Optional properties:
 - ti,edma-reserved-slot-ranges: PaRAM slot ranges which should not be used by
                the driver, they are allocated to be used by for example the
                DSP. See example.
+- dma-channel-mask: Mask of usable channels.
+               Single uint32 for EDMA with 32 channels, array of two uint32 for
+               EDMA with 64 channels. See example and
+               Documentation/devicetree/bindings/dma/dma-common.yaml
+
 
 ------------------------------------------------------------------------------
 eDMA3 Transfer Controller
@@ -91,6 +96,9 @@ edma: edma@49000000 {
        ti,edma-memcpy-channels = <20 21>;
        /* The following PaRAM slots are reserved: 35-44 and 100-109 */
        ti,edma-reserved-slot-ranges = <35 10>, <100 10>;
+       /* The following channels are reserved: 35-44 */
+       dma-channel-mask = <0xffffffff /* Channel 0-31 */
+                           0xffffe007>; /* Channel 32-63 */
 };
 
 edma_tptc0: tptc@49800000 {