linux-kernel - RE: [PATCH v7 3/7] dt-bindings: bus: add CDX bus controller for versal net

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Date:   Tue, 7 Feb 2023 08:55:40 +0000
From:   "Gupta, Nipun" <Nipun.Gupta@....com>
To:     Rob Herring <robh@...nel.org>
CC:     "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
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        "git (AMD-Xilinx)" <git@....com>
Subject: RE: [PATCH v7 3/7] dt-bindings: bus: add CDX bus controller for
 versal net

[AMD Official Use Only - General]



> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: Wednesday, February 1, 2023 10:43 PM
> To: Gupta, Nipun <Nipun.Gupta@....com>
> Cc: krzysztof.kozlowski+dt@...aro.org; gregkh@...uxfoundation.org;
> rafael@...nel.org; eric.auger@...hat.com; alex.williamson@...hat.com;
> cohuck@...hat.com; song.bao.hua@...ilicon.com;
> mchehab+huawei@...nel.org; maz@...nel.org; f.fainelli@...il.com;
> jeffrey.l.hugo@...il.com; saravanak@...gle.com; Michael.Srba@...nam.cz;
> mani@...nel.org; yishaih@...dia.com; jgg@...pe.ca; jgg@...dia.com;
> robin.murphy@....com; will@...nel.org; joro@...tes.org;
> masahiroy@...nel.org; ndesaulniers@...gle.com; rdunlap@...radead.org;
> linux-arm-kernel@...ts.infradead.org; linux-kbuild@...r.kernel.org; linux-
> kernel@...r.kernel.org; devicetree@...r.kernel.org; okaya@...nel.org;
> Anand, Harpreet <harpreet.anand@....com>; Agarwal, Nikhil
> <nikhil.agarwal@....com>; Simek, Michal <michal.simek@....com>; git
> (AMD-Xilinx) <git@....com>
> Subject: Re: [PATCH v7 3/7] dt-bindings: bus: add CDX bus controller for versal
> net
> 
> Caution: This message originated from an External Source. Use proper caution
> when opening attachments, clicking links, or responding.
> 
> 
> On Tue, Jan 31, 2023 at 02:10:45PM +0530, Nipun Gupta wrote:
> > Add CDX bus controller device tree bindings for versal-net
> > devices.
> >
> > Signed-off-by: Nipun Gupta <nipun.gupta@....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
> >
> > diff --git a/Documentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml
> b/Documentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml
> > 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@....com>
> > +  - Nikhil Agarwal <nikhil.agarwal@....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