linux-kernel - [PATCH 1/3] dt-bindings: i2c: mv64xxx: Document DMA properties

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Date:   Mon, 29 Aug 2022 21:08:22 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Cc:     Samuel Holland <samuel@...lland.org>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev
Subject: [PATCH 1/3] dt-bindings: i2c: mv64xxx: Document DMA properties

Allwinner's I2C offload engine includes bidirectional DMA support. Add
the properties for describing this in the devicetree. "dmas" is optional
because not all instances of the controller have their DRQs hooked up.
For example, R_I2C0 and R_I2C1 on V536 have no DRQ number assigned.

Signed-off-by: Samuel Holland <samuel@...lland.org>
---

 .../bindings/i2c/marvell,mv64xxx-i2c.yaml           | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
index 0ec033e48830..63d665a4f9bb 100644
--- a/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
@@ -66,6 +66,19 @@ properties:
   resets:
     maxItems: 1
 
+  dmas:
+    items:
+      - description: RX DMA Channel
+      - description: TX DMA Channel
+
+  dma-names:
+    items:
+      - const: rx
+      - const: tx
+
+dependencies:
+  dmas: [ dma-names ]
+
 required:
   - compatible
   - reg
-- 
2.35.1