linux-kernel - [PATCH 03/19] dt-bindings: bus: add CDX bus controller device tree bindings

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Message-ID: <20230117134139.1298-4-nipun.gupta@amd.com>
Date:   Tue, 17 Jan 2023 19:11:35 +0530
From:   Nipun Gupta <nipun.gupta@....com>
To:     <robh+dt@...nel.org>, <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>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kbuild@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
CC:     <okaya@...nel.org>, <harpreet.anand@....com>,
        <nikhil.agarwal@....com>, <michal.simek@....com>, <git@....com>,
        Nipun Gupta <nipun.gupta@....com>
Subject: [PATCH 03/19] dt-bindings: bus: add CDX bus controller device tree bindings

Add device tree bindings for CDX bus controller.

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

diff --git a/Documentation/devicetree/bindings/bus/xlnx,cdxbus-controller.yaml b/Documentation/devicetree/bindings/bus/xlnx,cdxbus-controller.yaml
new file mode 100644
index 000000000000..b2f186864021
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/xlnx,cdxbus-controller.yaml
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bus/xlnx,cdxbus-controller.yaml#
+$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,cdxbus-controller
+
+  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:
+  - |
+    cdxbus-controller {
+        compatible = "xlnx,cdxbus-controller";
+        /* 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>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 25c76cf27f21..b43242546b17 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -966,6 +966,7 @@ AMD CDX BUS DRIVER
 M:	Nipun Gupta <nipun.gupta@....com>
 M:	Nikhil Agarwal <nikhil.agarwal@....com>
 S:	Maintained
+F:	Documentation/devicetree/bindings/bus/xlnx,cdxbus-controller.yaml
 F:	drivers/bus/cdx/*
 F:	include/linux/cdx/*
 
-- 
2.17.1