linux-kernel - [PATCH v4 13/19] dt-bindings: dma: ti: Add K3 PKTDMA V2

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Message-ID: <20260130110159.359501-14-s-adivi@ti.com>
Date: Fri, 30 Jan 2026 16:31:53 +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>, <dmaengine@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <vigneshr@...com>, <s-adivi@...com>
CC: <r-sharma3@...com>, <gehariprasath@...com>
Subject: [PATCH v4 13/19] dt-bindings: dma: ti: Add 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/ti,k3-pktdma-v2.yaml      | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/ti/ti,k3-pktdma-v2.yaml

diff --git a/Documentation/devicetree/bindings/dma/ti/ti,k3-pktdma-v2.yaml b/Documentation/devicetree/bindings/dma/ti/ti,k3-pktdma-v2.yaml
new file mode 100644
index 0000000000000..e8afa6f6738b7
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/ti/ti,k3-pktdma-v2.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2024-2025 Texas Instruments Incorporated
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/ti/ti,k3-pktdma-v2.yaml#
+$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,am62l-dmss-pktdma
+
+  reg:
+    items:
+      - description: Packet DMA Control /Status
+      - description: Channel Realtime
+      - description: Ring Realtime
+
+  reg-names:
+    items:
+      - const: gcfg
+      - const: chanrt
+      - const: ringrt
+
+  "#dma-cells":
+    const: 2
+    description: |
+      cell 1: Channel identification for the peripheral
+        PSI-L thread ID of the remote (to BCDMA) end.
+        Valid ranges for thread ID depends on the data movement direction:
+        for source thread IDs (rx): 0 - 0x7fff
+        for destination thread IDs (tx): 0x8000 - 0xffff
+
+        Please refer to the device documentation for the PSI-L thread map and
+        also the PSI-L peripheral chapter for the correct thread ID.
+
+      cell 2: ASEL value for the channel
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - "#dma-cells"
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    main {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        main_pktdma: dma-controller@...c0000 {
+            compatible = "ti,am62l-dmss-pktdma";
+            reg = <0x00 0x485c0000 0x00 0x4000>,
+                  <0x00 0x48900000 0x00 0x80000>,
+                  <0x00 0x47200000 0x00 0x100000>;
+            reg-names = "gcfg", "chanrt", "ringrt";
+            #dma-cells = <2>;
+        };
+
+        serial@...0000 {
+            compatible = "ti,am64-uart", "ti,am654-uart";
+            reg = <0x00 0x02800000 0x00 0x100>;
+            power-domains = <&scmi_pds 89>;
+            clocks = <&scmi_clk 358>;
+            clock-names = "fclk";
+            dmas = <&main_pktdma 0xc400 0>,
+                   /* tx: PSI-L thread ID, ASEL value */
+                   <&main_pktdma 0x4400 0>;
+                   /* rx: PSI-L thread ID, ASEL value */
+            dma-names = "tx", "rx";
+        };
+    };
-- 
2.34.1