linux-kernel - [PATCH v2 2/3] dt-bindings: dma: ti-edma: Document dma-channel-mask for EDMA

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Date:   Tue, 10 Sep 2019 14:45:58 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <vkoul@...nel.org>, <robh+dt@...nel.org>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <dan.j.williams@...el.com>, <devicetree@...r.kernel.org>
Subject: [PATCH v2 2/3] 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@...com>
---
 Documentation/devicetree/bindings/dma/ti-edma.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/ti-edma.txt b/Documentation/devicetree/bindings/dma/ti-edma.txt
index 4bbc94d829c8..3c7736246354 100644
--- a/Documentation/devicetree/bindings/dma/ti-edma.txt
+++ b/Documentation/devicetree/bindings/dma/ti-edma.txt
@@ -42,6 +42,9 @@ 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, see
+		Documentation/devicetree/bindings/dma/dma-common.yaml
+
 
 ------------------------------------------------------------------------------
 eDMA3 Transfer Controller
@@ -91,6 +94,9 @@ edma: edma@...00000 {
 	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@...00000 {
-- 
Peter

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