linux-kernel - [PATCH v3 2/3] dt-bindings: dma: ti-edma: Document dma-channel-mask for EDMA

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Message-ID: <20190926111954.9184-3-peter.ujfalusi@ti.com>
Date:   Thu, 26 Sep 2019 14:19:53 +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 v3 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 | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/ti-edma.txt b/Documentation/devicetree/bindings/dma/ti-edma.txt
index 4bbc94d829c8..014187088020 100644
--- 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@...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

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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