linux-kernel - [PATCH 1/8] dt-bindings: dma: ti: Add document for K3 BCDMA V2

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Message-ID: <20250428072032.946008-2-s-adivi@ti.com>
Date: Mon, 28 Apr 2025 12:50:25 +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 1/8] dt-bindings: dma: ti: Add document for K3 BCDMA V2

New binding document for
Texas Instruments K3 Block Copy DMA (BCDMA) V2.

BCDMA V2 is introduced as part of AM62L.

Signed-off-by: Sai Sree Kartheek Adivi <s-adivi@...com>
---
 .../bindings/dma/ti/k3-bcdma-v2.yaml          | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/ti/k3-bcdma-v2.yaml

diff --git a/Documentation/devicetree/bindings/dma/ti/k3-bcdma-v2.yaml b/Documentation/devicetree/bindings/dma/ti/k3-bcdma-v2.yaml
new file mode 100644
index 0000000000000..af4aa3839fd66
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/ti/k3-bcdma-v2.yaml
@@ -0,0 +1,97 @@
+# 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
+---
+$id: http://devicetree.org/schemas/dma/ti/k3-bcdma-v2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments K3 DMSS BCDMA V2
+
+maintainers:
+  - Sai Sree Kartheek Adivi <s-adivi@...com>
+
+description: |
+  The BCDMA V2 is intended to perform similar functions as the TR
+  mode channels of K3 UDMA-P.
+  BCDMA V2 includes block copy channels and Split channels.
+
+  Block copy channels mainly used for memory to memory transfers, but with
+  optional triggers a block copy channel can service peripherals by accessing
+  directly to memory mapped registers or area.
+
+  Split channels can be used 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-bcdma-v2
+
+  reg:
+    items:
+      - description: BCDMA Control /Status Registers region
+      - description: Block Copy Channel Realtime Registers region
+      - description: Channel Realtime Registers region
+      - description: Ring Realtime Registers region
+
+  reg-names:
+    items:
+      - const: gcfg
+      - const: bchanrt
+      - const: chanrt
+      - const: ringrt
+
+  "#dma-cells":
+    const: 4
+    description: |
+      cell 1: Trigger type for the channel
+        0 - disable / no trigger
+        1 - internal channel event
+        2 - external signal
+        3 - timer manager event
+
+      cell 2: parameter for the trigger:
+        if cell 1 is 0 (disable / no trigger):
+          Unused, ignored
+        if cell 1 is 1 (internal channel event):
+          channel number whose TR event should trigger the current channel.
+        if cell 1 is 2 or 3 (external signal or timer manager event):
+          index of global interfaces that come into the DMA.
+
+          Please refer to the device documentation for global interface indexes.
+
+      cell 3: Channel number for the peripheral
+
+        Please refer to the device documentation for the channel map.
+
+      cell 4: ASEL value for the channel
+
+required:
+  - compatible
+  - "#dma-cells"
+  - reg
+  - reg-names
+
+unevaluatedProperties: false
+
+examples:
+  - |+
+    cbass_main {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+      main_bcdma: dma-controller@...c4000 {
+          compatible = "ti,dmss-bcdma-v2";
+          reg = <0x00 0x485c4000 0x00 0x4000>,
+                <0x00 0x48880000 0x00 0x10000>,
+                <0x00 0x48800000 0x00 0x80000>,
+                <0x00 0x47000000 0x00 0x200000>;
+          reg-names = "gcfg", "bchanrt", "chanrt", "ringrt";
+          #dma-cells = <4>;
+        };
+    };
-- 
2.34.1