linux-kernel - [PATCH net-next V3 1/3] dt-bindings: net: xilinx_axienet: Introduce dmaengine binding support

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Date:   Wed, 10 May 2023 14:20:29 +0530
From:   Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>
CC:     <linux@...linux.org.uk>, <michal.simek@....com>,
        <radhey.shyam.pandey@....com>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <anirudha.sarangi@....com>,
        <harini.katakam@....com>, <sarath.babu.naidu.gaddam@....com>,
        <git@....com>
Subject: [PATCH net-next V3 1/3] dt-bindings: net: xilinx_axienet: Introduce dmaengine binding support

From: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>

The axiethernet driver will use dmaengine framework to communicate
with dma controller IP instead of built-in dma programming sequence.

To request dma transmit and receive channels the axiethernet driver uses
generic dmas, dma-names properties.

Also to support the backward compatibility, use "dmas" property to
identify as it should use dmaengine framework or legacy
driver(built-in dma programming).

At this point it is recommended to use dmaengine framework but it's
optional. Once the solution is stable will make dmas as
required properties.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Signed-off-by: Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
---
These changes are on top of below txt to yaml conversion discussion
https://lore.kernel.org/all/20230308061223.1358637-1-sarath.babu.naidu.gaddam@amd.com/#Z2e.:20230308061223.1358637-1-sarath.babu.naidu.gaddam::40amd.com:1bindings:net:xlnx::2caxi-ethernet.yaml

Changes in V3:
1) Reverted reg and interrupts property to  support backward compatibility.
2) Moved dmas and dma-names properties from Required properties.

Changes in V2:
- None.
---
 .../devicetree/bindings/net/xlnx,axi-ethernet.yaml   | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml b/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
index 80843c177029..9dfa1976e260 100644
--- a/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
+++ b/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
@@ -122,6 +122,16 @@ properties:
       modes, where "pcs-handle" should be used to point to the PCS/PMA PHY,
       and "phy-handle" should point to an external PHY if exists.
 
+  dmas:
+    items:
+      - description: TX DMA Channel phandle and DMA request line number
+      - description: RX DMA Channel phandle and DMA request line number
+
+  dma-names:
+    items:
+      - const: tx_chan0
+      - const: rx_chan0
+
 required:
   - compatible
   - interrupts
@@ -157,6 +167,8 @@ examples:
         clocks = <&axi_clk>, <&axi_clk>, <&pl_enet_ref_clk>, <&mgt_clk>;
         phy-mode = "mii";
         reg = <0x40c00000 0x40000>,<0x50c00000 0x40000>;
+        dmas = <&xilinx_dma 0>, <&xilinx_dma 1>;
+        dma-names = "tx_chan0", "rx_chan0";
         xlnx,rxcsum = <0x2>;
         xlnx,rxmem = <0x800>;
         xlnx,txcsum = <0x2>;
-- 
2.25.1