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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/bus/xlnx,versal-net-cdx.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: AMD CDX bus controller
description: |
CDX bus controller for AMD devices is implemented to dynamically
detect CDX bus and devices using the firmware.
The CDX bus manages multiple FPGA based hardware devices, which
can support network, crypto or any other specialized type of
devices. These FPGA based devices can be added/modified dynamically
on run-time.
All devices on the CDX bus will have a unique streamid (for IOMMU)
and a unique device ID (for MSI) corresponding to a requestor ID
(one to one associated with the device). The streamid and deviceid
are used to configure SMMU and GIC-ITS respectively.
iommu-map property is used to define the set of stream ids
corresponding to each device and the associated IOMMU.
The MSI writes are accompanied by sideband data (Device ID).
The msi-map property is used to associate the devices with the
device ID as well as the associated ITS controller.
rproc property (xlnx,rproc) is used to identify the remote processor
with which APU (Application Processor Unit) interacts to find out
the bus and device configuration.
maintainers:
- Nipun Gupta <nipun.gupta@amd.com>
- Nikhil Agarwal <nikhil.agarwal@amd.com>
properties:
compatible:
const: xlnx,versal-net-cdx
iommu-map: true
msi-map: true
xlnx,rproc:
$ref: /schemas/types.yaml#/definitions/phandle
description:
phandle to the remoteproc_r5 rproc node using which APU interacts
with remote processor.
ranges: true
"#address-cells":
enum: [1, 2]
"#size-cells":
enum: [1, 2]
required:
- compatible
- iommu-map
- msi-map
- xlnx,rproc
- ranges
- "#address-cells"
- "#size-cells"
additionalProperties: false
examples:
- |
cdx {
compatible = "xlnx,versal-net-cdx";
#address-cells = <1>;
#size-cells = <1>;
/* define map for RIDs 250-259 */
iommu-map = <250 &smmu 250 10>;
/* define msi map for RIDs 250-259 */
msi-map = <250 &its 250 10>;
xlnx,rproc = <&remoteproc_r5>;
ranges;
};
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