[AMD Official Use Only - General]

-----Original Message-----
From: Rob Herring <robh@kernel.org>
Sent: Wednesday, February 1, 2023 10:43 PM
To: Gupta, Nipun <Nipun.Gupta@amd.com>
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Subject: Re: [PATCH v7 3/7] dt-bindings: bus: add CDX bus controller for versal
net

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On Tue, Jan 31, 2023 at 02:10:45PM +0530, Nipun Gupta wrote:

quoted

Add CDX bus controller device tree bindings for versal-net
devices.

Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
---
 .../bindings/bus/xlnx,versal-net-cdx.yaml     | 68 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 69 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bus/xlnx,versal-

net-cdx.yaml

quoted

diff --git a/Documentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml

b/Documentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml

quoted

new file mode 100644
index 000000000000..8452185b9d70

--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml

@@ -0,0 +1,68 @@
+# 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 on these bus 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.
+
+required:
+  - compatible
+  - iommu-map
+  - msi-map
+  - xlnx,rproc
+
+additionalProperties: false
+
+examples:
+  - |
+    cdx {
+        compatible = "xlnx,versal-net-cdx";
+        /* 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>;

There's no addresses associated with this bus? Like the address range
the devices are at.

Hi Rob,

There is a remoteproc device which is associated with this controller, which
exposes the address for CDX bus controller and hence no reg/address required
in this node. 

You should have 'ranges' whether Linux needs it yet
or not.

Agree, will add this to the next spin.

Thanks,
Nipun

Rob

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