This patch adds a devicetree binding documentation for CDX bus. Signed-off-by: Nipun Gupta <nipun.gupta@xxxxxxx> --- .../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@xxxxxxx> + - Nikhil Agarwal <nikhil.agarwal@xxxxxxx> + +properties: + compatible: + const: xlnx,cdxbus-controller-1.0 + + 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 { + 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@xxxxxxx> +M: Nikhil Agarwal <nikhil.agarwal@xxxxxxx> +S: Maintained +F: Documentation/devicetree/bindings/bus/xlnx,cdx.yaml + AMD CRYPTOGRAPHIC COPROCESSOR (CCP) DRIVER - SEV SUPPORT M: Brijesh Singh <brijesh.singh@xxxxxxx> M: Tom Lendacky <thomas.lendacky@xxxxxxx> -- 2.25.1
