linux/Documentation/devicetree/bindings/misc/fsl,qoriq-mc.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/misc/fsl,qoriq-mc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Freescale Management Complex

maintainers:
  - Frank Li <Frank.Li@nxp.com>

description: |
  The Freescale Management Complex (fsl-mc) is a hardware resource
  manager that manages specialized hardware objects used in
  network-oriented packet processing applications. After the fsl-mc
  block is enabled, pools of hardware resources are available, such as
  queues, buffer pools, I/O interfaces. These resources are building
  blocks that can be used to create functional hardware objects/devices
  such as network interfaces, crypto accelerator instances, L2 switches,
  etc.

  For an overview of the DPAA2 architecture and fsl-mc bus see:
  Documentation/networking/device_drivers/ethernet/freescale/dpaa2/overview.rst

  As described in the above overview, all DPAA2 objects in a DPRC share the
  same hardware "isolation context" and a 10-bit value called an ICID
  (isolation context id) is expressed by the hardware to identify
  the requester.

  The generic 'iommus' property is insufficient to describe the relationship
  between ICIDs and IOMMUs, so an iommu-map property is used to define
  the set of possible ICIDs under a root DPRC and how they map to
  an IOMMU.

  For generic IOMMU bindings, see
  Documentation/devicetree/bindings/iommu/iommu.txt.

  For arm-smmu binding, see:
  Documentation/devicetree/bindings/iommu/arm,smmu.yaml.

  The MSI writes are accompanied by sideband data which is derived from the ICID.
  The msi-map property is used to associate the devices with both the ITS
  controller and the sideband data which accompanies the writes.

  For generic MSI bindings, see
  Documentation/devicetree/bindings/interrupt-controller/msi.txt.

  For GICv3 and GIC ITS bindings, see:
  Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml.  

properties:
  compatible:
    enum:
      - fsl,qoriq-mc
    description:
      Must be "fsl,qoriq-mc".  A Freescale Management Complex
      compatible with this binding must have Block Revision
      Registers BRR1 and BRR2 at offset 0x0BF8 and 0x0BFC in
      the MC control register region.

  reg:
    items:
      - description:
          the first region is the command portal for the
          this machine and must always be present

      - description:
          the second region is the MC control registers. This
          region may not be present in some scenarios, such
          as in the device tree presented to a virtual machine.

  ranges:
    description: |
      A standard property.  Defines the mapping between the child
      MC address space and the parent system address space.

      The MC address space is defined by 3 components:
        <region type> <offset hi> <offset lo>

      Valid values for region type are
        0x0 - MC portals
        0x1 - QBMAN portals      

  "#address-cells":
    const: 3

  "#size-cells":
    const: 1

  iommu-map:
    description: |
      Maps an ICID to an IOMMU and associated iommu-specifier
      data.

      The property is an arbitrary number of tuples of
      (icid-base,iommu,iommu-base,length).

      Any ICID i in the interval [icid-base, icid-base + length) is
      associated with the listed IOMMU, with the iommu-specifier
      (i - icid-base + iommu-base).      

  msi-map:
    description: |
      Maps an ICID to a GIC ITS and associated msi-specifier
      data.

      The property is an arbitrary number of tuples of
      (icid-base,gic-its,msi-base,length).

      Any ICID in the interval [icid-base, icid-base + length) is
      associated with the listed GIC ITS, with the msi-specifier
      (i - icid-base + msi-base).      

  msi-parent:
    deprecated: true
    maxItems: 1
    description:
      Describes the MSI controller node handling message
      interrupts for the MC. When there is no translation
      between the ICID and deviceID this property can be used
      to describe the MSI controller used by the devices on the
      mc-bus.
      The use of this property for mc-bus is deprecated. Please
      use msi-map.

  dma-coherent: true

  dpmacs:
    type: object
    description:
      The fsl-mc node may optionally have dpmac sub-nodes that describe
      the relationship between the Ethernet MACs which belong to the MC
      and the Ethernet PHYs on the system board.

    properties:
      "#address-cells":
        const: 1

      "#size-cells":
        const: 0

    patternProperties:
      '^ethernet@[a-f0-9]+$':
        $ref: /schemas/net/fsl,qoriq-mc-dpmac.yaml

    additionalProperties: false

required:
  - compatible
  - reg
  - ranges
  - "#address-cells"
  - "#size-cells"

additionalProperties: false

examples:
  - |
    fsl-mc@80c000000 {
        compatible = "fsl,qoriq-mc";
        reg = <0x0c000000 0x40>,    /* MC portal base */
              <0x08340000 0x40000>; /* MC control reg */
        /*
         * Region type 0x0 - MC portals
         * Region type 0x1 - QBMAN portals
         */
        ranges = <0x0 0x0 0x8 0x0c000000 0x4000000
                 0x1 0x0 0x8 0x18000000 0x8000000>;
        
        /* define map for ICIDs 23-64 */
        iommu-map = <23 &smmu 23 41>;
        /* define msi map for ICIDs 23-64 */
        msi-map = <23 &its 23 41>;
        #address-cells = <3>;
        #size-cells = <1>;

        dpmacs {
            #address-cells = <1>;
            #size-cells = <0>;

            ethernet@1 {
                compatible = "fsl,qoriq-mc-dpmac";
                reg = <1>;
                phy-handle = <&mdio0_phy0>;
            };
        };
    };