linux-kernel - [RFC V2 PATCH 2/3] dt-bindings: net: xilinx_axienet: Introduce dmaengine binding support

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Date:   Tue, 20 Sep 2022 11:27:02 +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>, <linux@...linux.org.uk>
CC:     <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <michal.simek@....com>,
        <radhey.shyam.pandey@....com>, <anirudha.sarangi@....com>,
        <harini.katakam@....com>, <sarath.babu.naidu.gaddam@....com>,
        <git@...inx.com>, <git@....com>
Subject: [RFC V2 PATCH 2/3] dt-bindings: net: xilinx_axienet: Introduce dmaengine binding support

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

The axiethernet driver will now 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. It deprecates axistream-connected
property, remove axidma reg and interrupt properties from the ethernet
node. Just to highlight that these DT changes are not backward compatible
due to major driver restructuring/cleanup done in adopting the dmaengine
framework.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Signed-off-by: Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
---
Changes in V2:
- None.
---
 .../devicetree/bindings/net/xlnx,axiethernet.yaml  |   39 ++++++++++++--------
 1 files changed, 23 insertions(+), 16 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/xlnx,axiethernet.yaml b/Documentation/devicetree/bindings/net/xlnx,axiethernet.yaml
index 780edf3..1dc1719 100644
--- a/Documentation/devicetree/bindings/net/xlnx,axiethernet.yaml
+++ b/Documentation/devicetree/bindings/net/xlnx,axiethernet.yaml
@@ -14,10 +14,8 @@ description: |
   offloading TX/RX checksum calculation off the processor.
 
   Management configuration is done through the AXI interface, while payload is
-  sent and received through means of an AXI DMA controller. This driver
-  includes the DMA driver code, so this driver is incompatible with AXI DMA
-  driver.
-
+  sent and received through means of an AXI DMA controller using dmaengine
+  framework.
 
 allOf:
   - $ref: "ethernet-controller.yaml#"
@@ -36,19 +34,13 @@ properties:
 
   reg:
     description:
-      Address and length of the IO space, as well as the address
-      and length of the AXI DMA controller IO space, unless
-      axistream-connected is specified, in which case the reg
-      attribute of the node referenced by it is used.
-    maxItems: 2
+      Address and length of the IO space.
+    maxItems: 1
 
   interrupts:
     description:
-      Can point to at most 3 interrupts. TX DMA, RX DMA, and optionally Ethernet
-      core. If axistream-connected is specified, the TX/RX DMA interrupts should
-      be on that node instead, and only the Ethernet core interrupt is optionally
-      specified here.
-    maxItems: 3
+      Ethernet core interrupt.
+    maxItems: 1
 
   phy-handle: true
 
@@ -109,6 +101,7 @@ properties:
       for the AXI DMA controller used by this device. If this is specified,
       the DMA-related resources from that device (DMA registers and DMA
       TX/RX interrupts) rather than this one will be used.
+    deprecated: true
 
   mdio: true
 
@@ -118,12 +111,24 @@ properties:
       and "phy-handle" should point to an external PHY if exists.
     $ref: /schemas/types.yaml#/definitions/phandle
 
+  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
   - reg
   - xlnx,rxmem
   - phy-handle
+  - dmas
+  - dma-names
 
 additionalProperties: false
 
@@ -132,11 +137,13 @@ examples:
     axi_ethernet_eth: ethernet@...00000 {
       compatible = "xlnx,axi-ethernet-1.00.a";
       interrupt-parent = <&microblaze_0_axi_intc>;
-      interrupts = <2>, <0>, <1>;
+      interrupts = <1>;
       clock-names = "s_axi_lite_clk", "axis_clk", "ref_clk", "mgt_clk";
       clocks = <&axi_clk>, <&axi_clk>, <&pl_enet_ref_clk>, <&mgt_clk>;
       phy-mode = "mii";
-      reg = <0x40c00000 0x40000>,<0x50c00000 0x40000>;
+      reg = <0x40c00000 0x40000>;
+      dmas = <&xilinx_dma 0>, <&xilinx_dma 1>;
+      dma-names = "tx_chan0", "rx_chan0";
       xlnx,rxcsum = <0x2>;
       xlnx,rxmem = <0x800>;
       xlnx,txcsum = <0x2>;
-- 
1.7.1