linux-kernel - [PATCH v3 2/2] dt-bindings: dma: adi,axi-dmac: deprecate adi,channels node

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Message-Id: <20241030-axi-dma-dt-yaml-v3-2-d3a9b506f96c@baylibre.com>
Date: Wed, 30 Oct 2024 16:33:57 -0500
From: David Lechner <dlechner@...libre.com>
To: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Nuno Sa <nuno.sa@...log.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>, dmaengine@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH v3 2/2] dt-bindings: dma: adi,axi-dmac: deprecate
 adi,channels node

Deprecate the adi,channels node in the adi,axi-dmac binding. Prior to
IP version 4.3.a, this information was required. Since then, there are
memory-mapped registers that can be read to get the same information.

Acked-by: Nuno Sa <nuno.sa@...log.com>
Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
Signed-off-by: David Lechner <dlechner@...libre.com>
---

For context, the adi,channels node has not been required in the Linux
kernel since [1].

[1]: https://lore.kernel.org/all/20200825151950.57605-7-alexandru.ardelean@analog.com/
---
 .../devicetree/bindings/dma/adi,axi-dmac.yaml        | 20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/adi,axi-dmac.yaml b/Documentation/devicetree/bindings/dma/adi,axi-dmac.yaml
index b1f4bdcab4fd..63b6fb0423c2 100644
--- a/Documentation/devicetree/bindings/dma/adi,axi-dmac.yaml
+++ b/Documentation/devicetree/bindings/dma/adi,axi-dmac.yaml
@@ -33,8 +33,12 @@ properties:
     const: 1
 
   adi,channels:
+    deprecated: true
     type: object
-    description: This sub-node must contain a sub-node for each DMA channel.
+    description:
+      This sub-node must contain a sub-node for each DMA channel. This node is
+      only required for IP versions older than 4.3.a and should otherwise be
+      omitted.
     additionalProperties: false
 
     properties:
@@ -113,7 +117,6 @@ required:
   - interrupts
   - clocks
   - "#dma-cells"
-  - adi,channels
 
 examples:
   - |
@@ -123,17 +126,4 @@ examples:
         interrupts = <0 57 0>;
         clocks = <&clkc 16>;
         #dma-cells = <1>;
-
-        adi,channels {
-            #size-cells = <0>;
-            #address-cells = <1>;
-
-            dma-channel@0 {
-                reg = <0>;
-                adi,source-bus-width = <32>;
-                adi,source-bus-type = <0>; /* Memory mapped */
-                adi,destination-bus-width = <64>;
-                adi,destination-bus-type = <2>; /* FIFO */
-            };
-        };
     };

-- 
2.43.0