linux-kernel - [PATCH 2/8] dt-bindings: dma: ti: Add document for K3 PKTDMA V2

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Message-ID: <20250428072032.946008-3-s-adivi@ti.com>
Date: Mon, 28 Apr 2025 12:50:26 +0530
From: Sai Sree Kartheek Adivi <s-adivi@...com>
To: <peter.ujfalusi@...il.com>, <vkoul@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <nm@...com>,
        <ssantosh@...nel.org>, <s-adivi@...com>, <dmaengine@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <praneeth@...com>,
        <vigneshr@...com>, <u-kumar1@...com>, <a-chavda@...com>
Subject: [PATCH 2/8] dt-bindings: dma: ti: Add document for K3 PKTDMA V2

New binding document for
Texas Instruments K3 Packet DMA (PKTDMA) V2.

PKTDMA V2 is introduced as part of AM62L.

Signed-off-by: Sai Sree Kartheek Adivi <s-adivi@...com>
---
 .../bindings/dma/ti/k3-pktdma-v2.yaml         | 73 +++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/ti/k3-pktdma-v2.yaml

diff --git a/Documentation/devicetree/bindings/dma/ti/k3-pktdma-v2.yaml b/Documentation/devicetree/bindings/dma/ti/k3-pktdma-v2.yaml
new file mode 100644
index 0000000000000..a6aae96af44df
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/ti/k3-pktdma-v2.yaml
@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2024-2025 Texas Instruments Incorporated
+# Author: Sai Sree Kartheek Adivi <s-adivi@...com>
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/ti/k3-pktdma-v2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments K3 DMSS PKTDMA V2
+
+maintainers:
+  - Sai Sree Kartheek Adivi <s-adivi@...com>
+
+description: |
+  The PKTDMA V2 is intended to perform similar functions as the packet
+  mode channels of K3 UDMA-P.
+  PKTDMA V2 only includes Split channels to service PSI-L based peripherals.
+
+  The peripherals can be PSI-L native or legacy, non PSI-L native peripherals
+  with PDMAs. PDMA is tasked to act as a bridge between the PSI-L fabric and the
+  legacy peripheral.
+
+allOf:
+  - $ref: /schemas/dma/dma-controller.yaml#
+
+properties:
+  compatible:
+    const: ti,dmss-pktdma-v2
+
+  "#dma-cells":
+    const: 2
+    description: |
+      cell 1: Channel number for the peripheral
+
+        Please refer to the device documentation for the channel map.
+
+      cell 2: ASEL value for the channel
+
+  reg:
+    items:
+      - description: Packet DMA Control /Status Registers region
+      - description: Channel Realtime Registers region
+      - description: Ring Realtime Registers region
+
+  reg-names:
+    items:
+      - const: gcfg
+      - const: chanrt
+      - const: ringrt
+
+required:
+  - compatible
+  - "#dma-cells"
+  - reg
+  - reg-names
+
+unevaluatedProperties: false
+
+examples:
+  - |+
+    cbass_main {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+      main_pktdma: dma-controller@...c0000 {
+        compatible = "ti,dmss-pktdma-v2";
+        reg = <0x00 0x485c0000 0x00 0x4000>,
+          <0x00 0x48900000 0x00 0x80000>,
+          <0x00 0x47200000 0x00 0x100000>;
+        reg-names = "gcfg", "chanrt", "ringrt";
+        #dma-cells = <2>;
+      };
+    };
-- 
2.34.1