[PATCH v4 08/15] dt-bindings: dma: ti: Add document for K3 UDMA

[Peter Ujfalusi <peter.ujfalusi@ti.com>]

New binding document for
Texas Instruments K3 NAVSS Unified DMA – Peripheral Root Complex (UDMA-P).

UDMA-P is introduced as part of the K3 architecture and can be found in
AM654 and j721e.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
Rob,

can you give me some hint on how to fix these two warnings from dt_binding_check:

  DTC     Documentation/devicetree/bindings/dma/ti/k3-udma.example.dt.yaml
Documentation/devicetree/bindings/dma/ti/k3-udma.example.dts:23.13-72: Warning (ranges_format): /example-0/interconnect@30800000:ranges: "ranges" property has invalid length (24 bytes) (parent #address-cells == 1, child #address-cells == 2, #size-cells == 2)
  CHECK   Documentation/devicetree/bindings/dma/ti/k3-udma.example.dt.yaml

Documentation/devicetree/bindings/dma/ti/k3-udma.example.dt.yaml: interconnect@30800000: $nodename:0: 'interconnect@30800000' does not match '^(bus|soc|axi|ahb|apb)(@[0-9a-f]+)?$'

Thanks,
Peter

 .../devicetree/bindings/dma/ti/k3-udma.yaml   | 190 ++++++++++++++++++
 1 file changed, 190 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/ti/k3-udma.yaml

diff --git a/Documentation/devicetree/bindings/dma/ti/k3-udma.yaml b/Documentation/devicetree/bindings/dma/ti/k3-udma.yaml
new file mode 100644
index 000000000000..e00fe3b2364e
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/ti/k3-udma.yaml
@@ -0,0 +1,190 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/ti/k3-udma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments K3 NAVSS Unified DMA Device Tree Bindings
+
+maintainers:
+  - Peter Ujfalusi <peter.ujfalusi@ti.com>
+
+description: |
+  The UDMA-P is intended to perform similar (but significantly upgraded)
+  functions as the packet-oriented DMA used on previous SoC devices. The UDMA-P
+  module supports the transmission and reception of various packet types.
+  The UDMA-P is architected to facilitate the segmentation and reassembly of
+  SoC DMA data structure compliant packets to/from smaller data blocks that are
+  natively compatible with the specific requirements of each connected
+  peripheral.
+  Multiple Tx and Rx channels are provided within the DMA which allow multiple
+  segmentation or reassembly operations to be ongoing. The DMA controller
+  maintains state information for each of the channels which allows packet
+  segmentation and reassembly operations to be time division multiplexed between
+  channels in order to share the underlying DMA hardware. An external DMA
+  scheduler is used to control the ordering and rate at which this multiplexing
+  occurs for Transmit operations. The ordering and rate of Receive operations
+  is indirectly controlled by the order in which blocks are pushed into the DMA
+  on the Rx PSI-L interface.
+
+  The UDMA-P also supports acting as both a UTC and UDMA-C for its internal
+  channels. Channels in the UDMA-P can be configured to be either Packet-Based
+  or Third-Party channels on a channel by channel basis.
+
+  All transfers within NAVSS is done between PSI-L source and destination
+  threads.
+  The peripherals serviced by UDMA can be PSI-L native (sa2ul, cpsw, etc) or
+  legacy, non PSI-L native peripherals. In the later case a special, small PDMA
+  is tasked to act as a bridge between the PSI-L fabric and the legacy
+  peripheral.
+
+  PDMAs can be configured via UDMAP peer registers to match with the
+  configuration of the legacy peripheral.
+
+allOf:
+  - $ref: "../dma-controller.yaml#"
+
+properties:
+  "#dma-cells":
+    const: 1
+    description: |
+      The cell is the PSI-L  thread ID of the remote (to UDMAP) 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.
+
+  compatible:
+    oneOf:
+      - const: ti,am654-navss-main-udmap
+      - const: ti,am654-navss-mcu-udmap
+      - const: ti,j721e-navss-main-udmap
+      - const: ti,j721e-navss-mcu-udmap
+
+  reg:
+    maxItems: 3
+
+  reg-names:
+   items:
+     - const: gcfg
+     - const: rchanrt
+     - const: tchanrt
+
+  msi-parent: true
+
+  ti,sci:
+    description: |
+      phandle to TI-SCI compatible System controller node
+    maxItems: 1
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/phandle
+
+  ti,sci-dev-id:
+    description: |
+      TI-SCI device id of UDMAP
+    maxItems: 1
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+
+  ti,ringacc:
+    description: |
+      phandle to the ring accelerator node
+    maxItems: 1
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/phandle
+
+  ti,sci-rm-range-tchan:
+    description: |
+      Array of UDMA tchan resource subtypes for resource allocation for this
+      host
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32-array
+    items:
+      minItems: 1
+      # Should be enough
+      maxItems: 255
+
+  ti,sci-rm-range-rchan:
+    description: |
+      Array of UDMA rchan resource subtypes for resource allocation for this
+      host
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32-array
+    items:
+      minItems: 1
+      # Should be enough
+      maxItems: 255
+
+  ti,sci-rm-range-rflow:
+    description: |
+      Array of UDMA rflow resource subtypes for resource allocation for this
+      host
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32-array
+    items:
+      minItems: 1
+      # Should be enough
+      maxItems: 255
+
+required:
+  - compatible
+  - "#dma-cells"
+  - reg
+  - reg-names
+  - msi-parent
+  - ti,sci
+  - ti,sci-dev-id
+  - ti,ringacc
+  - ti,sci-rm-range-tchan
+  - ti,sci-rm-range-rchan
+  - ti,sci-rm-range-rflow
+
+examples:
+  - |+
+    cbass_main_navss: interconnect@30800000 {
+        compatible = "simple-bus";
+        #address-cells = <2>;
+        #size-cells = <2>;
+        dma-coherent;
+        dma-ranges;
+        ranges = <0x00 0x30800000 0x00 0x30800000 0x00 0x0bc00000>;
+
+        ti,sci-dev-id = <118>;
+
+        main_udmap: dma-controller@31150000 {
+            compatible = "ti,am654-navss-main-udmap";
+            reg = <0x0 0x31150000 0x0 0x100>,
+                  <0x0 0x34000000 0x0 0x100000>,
+                  <0x0 0x35000000 0x0 0x100000>;
+            reg-names = "gcfg", "rchanrt", "tchanrt";
+            #dma-cells = <1>;
+            
+            ti,ringacc = <&ringacc>;
+            
+            msi-parent = <&inta_main_udmass>;
+            
+            ti,sci = <&dmsc>;
+            ti,sci-dev-id = <188>;
+            
+            ti,sci-rm-range-tchan = <0x1>, /* TX_HCHAN */
+                                    <0x2>; /* TX_CHAN */
+            ti,sci-rm-range-rchan = <0x4>, /* RX_HCHAN */
+                                    <0x5>; /* RX_CHAN */
+            ti,sci-rm-range-rflow = <0x6>; /* GP RFLOW */
+        };
+    };
+
+    mcasp0: mcasp@02B00000 {
+        dmas = <&main_udmap 0xc400>, <&main_udmap 0x4400>;
+        dma-names = "tx", "rx";
+    };
+
+    crypto: crypto@4E00000 {
+        compatible = "ti,sa2ul-crypto";
+
+        dmas = <&main_udmap 0xc000>, <&main_udmap 0x4000>, <&main_udmap 0x4001>;
+        dma-names = "tx", "rx1", "rx2";
+    };
+
-- 
Peter

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