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From:   Akhil R <akhilrajeev@nvidia.com>
To:     <ldewangan@nvidia.com>, <jonathanh@nvidia.com>, <vkoul@kernel.org>,
        <thierry.reding@gmail.com>, <p.zabel@pengutronix.de>,
        <dmaengine@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
CC:     <akhilrajeev@nvidia.com>
Subject: [PATCH 1/3] dt-bindings: dmaengine: Add dma-channel-mask to Tegra GPCDMA
Date:   Tue, 13 Sep 2022 21:22:49 +0530
Message-ID: <20220913155251.59375-2-akhilrajeev@nvidia.com>
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Add dma-channel-mask property in Tegra GPCDMA document.

The property would help to specify the channels to be used in
kernel and reserve few for the firmware. This was previously
achieved by limiting the channel number to 31 in the driver.
Now since we can list all 32 channels, update the interrupts
property as well to list all 32 interrupts.

Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
 .../devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml   | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
index 7e575296df0c..31724cda074e 100644
--- a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
+++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
@@ -39,7 +39,7 @@ properties:
       Should contain all of the per-channel DMA interrupts in
       ascending order with respect to the DMA channel index.
     minItems: 1
-    maxItems: 31
+    maxItems: 32
 
   resets:
     maxItems: 1
@@ -52,6 +52,9 @@ properties:
 
   dma-coherent: true
 
+  dma-channel-mask:
+    maxItems: 1
+
 required:
   - compatible
   - reg
@@ -60,6 +63,7 @@ required:
   - reset-names
   - "#dma-cells"
   - iommus
+  - dma-channel-mask
 
 additionalProperties: false
 
@@ -108,5 +112,6 @@ examples:
         #dma-cells = <1>;
         iommus = <&smmu TEGRA186_SID_GPCDMA_0>;
         dma-coherent;
+        dma-channel-mask = <0xfffffffe>;
     };
 ...
-- 
2.17.1