linux-kernel - [PATCH RESEND v2 1/3] dt-bindings: dmaengine: Add dma-channel-mask to Tegra GPCDMA

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Message-ID: <20221020083322.36431-2-akhilrajeev@nvidia.com>
Date:   Thu, 20 Oct 2022 14:03:20 +0530
From:   Akhil R <akhilrajeev@...dia.com>
To:     <ldewangan@...dia.com>, <jonathanh@...dia.com>, <vkoul@...nel.org>,
        <thierry.reding@...il.com>, <p.zabel@...gutronix.de>,
        <dmaengine@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <sfr@...b.auug.org.au>
CC:     <akhilrajeev@...dia.com>
Subject: [PATCH RESEND v2 1/3] dt-bindings: dmaengine: Add dma-channel-mask to Tegra GPCDMA

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@...dia.com>
Acked-by: Thierry Reding <treding@...dia.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 c8894476b6ab..851bd50ee67f 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