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    SubjectRe: [RFC PATCH v4 1/8] dt-bindings: bus: add CDX bus device tree bindings
    On Fri, Oct 14, 2022 at 10:10:42AM +0530, Nipun Gupta wrote:
    > This patch adds a devicetree binding documentation for CDX
    > bus.

    Please read submitting-patches.rst and what it says about commit
    messages.

    >
    > Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
    > ---
    > .../devicetree/bindings/bus/xlnx,cdx.yaml | 65 +++++++++++++++++++
    > MAINTAINERS | 6 ++
    > 2 files changed, 71 insertions(+)
    > create mode 100644 Documentation/devicetree/bindings/bus/xlnx,cdx.yaml
    >
    > diff --git a/Documentation/devicetree/bindings/bus/xlnx,cdx.yaml b/Documentation/devicetree/bindings/bus/xlnx,cdx.yaml
    > new file mode 100644
    > index 000000000000..984ff65b668a
    > --- /dev/null
    > +++ b/Documentation/devicetree/bindings/bus/xlnx,cdx.yaml
    > @@ -0,0 +1,65 @@
    > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
    > +%YAML 1.2
    > +---
    > +$id: http://devicetree.org/schemas/bus/xlnx,cdx.yaml#
    > +$schema: http://devicetree.org/meta-schemas/core.yaml#
    > +
    > +title: AMD CDX bus controller
    > +
    > +description: |
    > + CDX bus controller detects CDX devices using CDX firmware and
    > + add those to cdx bus. 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.
    > +
    > +maintainers:
    > + - Nipun Gupta <nipun.gupta@amd.com>
    > + - Nikhil Agarwal <nikhil.agarwal@amd.com>
    > +
    > +properties:
    > + compatible:
    > + const: xlnx,cdxbus-controller-1.0

    Where does 1.0 come from?

    > +
    > + reg:
    > + maxItems: 1
    > +
    > + iommu-map: true
    > +
    > + msi-map: true
    > +
    > +required:
    > + - compatible
    > + - reg
    > + - iommu-map
    > + - msi-map
    > +
    > +additionalProperties: false
    > +
    > +examples:
    > + - |
    > + soc {
    > + #address-cells = <2>;
    > + #size-cells = <2>;
    > +
    > + cdx: cdx@4000000 {

    bus@...

    > + compatible = "xlnx,cdxbus-controller-1.0";
    > + reg = <0x00000000 0x04000000 0 0x1000>;
    > + /* 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>;
    > + };
    > + };
    > diff --git a/MAINTAINERS b/MAINTAINERS
    > index f5ca4aefd184..5f48f11fe0c3 100644
    > --- a/MAINTAINERS
    > +++ b/MAINTAINERS
    > @@ -935,6 +935,12 @@ S: Supported
    > F: drivers/crypto/ccp/
    > F: include/linux/ccp.h
    >
    > +AMD CDX BUS DRIVER
    > +M: Nipun Gupta <nipun.gupta@amd.com>
    > +M: Nikhil Agarwal <nikhil.agarwal@amd.com>
    > +S: Maintained
    > +F: Documentation/devicetree/bindings/bus/xlnx,cdx.yaml
    > +
    > AMD CRYPTOGRAPHIC COPROCESSOR (CCP) DRIVER - SEV SUPPORT
    > M: Brijesh Singh <brijesh.singh@amd.com>
    > M: Tom Lendacky <thomas.lendacky@amd.com>
    > --
    > 2.25.1
    >
    >

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