1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 # Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
5 $id: "http://devicetree.org/schemas/soc/ti/k3-ringacc.yaml#"
6 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
8 title: Texas Instruments K3 NavigatorSS Ring Accelerator
11 - Santosh Shilimkar <ssantosh@kernel.org>
12 - Grygorii Strashko <grygorii.strashko@ti.com>
15 The Ring Accelerator (RA) is a machine which converts read/write accesses
16 from/to a constant address into corresponding read/write accesses from/to a
17 circular data structure in memory. The RA eliminates the need for each DMA
18 controller which needs to access ring elements from having to know the current
19 state of the ring (base address, current offset). The DMA controller
20 performs a read or write access to a specific address range (which maps to the
21 source interface on the RA) and the RA replaces the address for the transaction
22 with a new address which corresponds to the head or tail element of the ring
23 (head for reads, tail for writes).
25 The Ring Accelerator is a hardware module that is responsible for accelerating
26 management of the packet queues. The K3 SoCs can have more than one RA instances
31 - const: ti,am654-navss-ringacc
35 - description: real time registers regions
36 - description: fifos registers regions
37 - description: proxy gcfg registers regions
38 - description: proxy target registers regions
50 $ref: /schemas/types.yaml#/definitions/uint32
51 description: Number of rings supported by RA
53 ti,sci-rm-range-gp-rings:
54 $ref: /schemas/types.yaml#/definitions/uint32
55 description: TI-SCI RM subtype for GP ring range
58 $ref: /schemas/types.yaml#/definitions/phandle-array
59 description: phandle on TI-SCI compatible System controller node
62 $ref: /schemas/types.yaml#/definitions/uint32
63 description: TI-SCI device id of the ring accelerator
71 - ti,sci-rm-range-gp-rings
75 additionalProperties: false
83 ringacc: ringacc@3c000000 {
84 compatible = "ti,am654-navss-ringacc";
85 reg = <0x0 0x3c000000 0x0 0x400000>,
86 <0x0 0x38000000 0x0 0x400000>,
87 <0x0 0x31120000 0x0 0x100>,
88 <0x0 0x33000000 0x0 0x40000>;
89 reg-names = "rt", "fifos", "proxy_gcfg", "proxy_target";
91 ti,sci-rm-range-gp-rings = <0x2>; /* GP ring range */
93 ti,sci-dev-id = <187>;
94 msi-parent = <&inta_main_udmass>;