linux/linux-5.4.31/Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt

* Freescale Management Complex

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/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.txt.

Required properties:

    - compatible
        Value type: <string>
        Definition: 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
        Value type: <prop-encoded-array>
        Definition: A standard property.  Specifies one or two regions
                    defining the MC's registers:

                       -the first region is the command portal for the
                        this machine and must always be present

                       -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.

    - msi-parent
        Value type: <phandle>
        Definition: Must be present and point to the MSI controller node
                    handling message interrupts for the MC.

    - ranges
        Value type: <prop-encoded-array>
        Definition: 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
        Value type: <u32>
        Definition: Must be 3.  (see definition in 'ranges' property)

    - #size-cells
        Value type: <u32>
        Definition: Must be 1.

Sub-nodes:

        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.

        The dpmac nodes must be under a node named "dpmacs" which contains
        the following properties:

            - #address-cells
              Value type: <u32>
              Definition: Must be present if dpmac sub-nodes are defined and must
                          have a value of 1.

            - #size-cells
              Value type: <u32>
              Definition: Must be present if dpmac sub-nodes are defined and must
                          have a value of 0.

        These nodes must have the following properties:

            - compatible
              Value type: <string>
              Definition: Must be "fsl,qoriq-mc-dpmac".

            - reg
              Value type: <prop-encoded-array>
              Definition: Specifies the id of the dpmac.

            - phy-handle
              Value type: <phandle>
              Definition: Specifies the phandle to the PHY device node associated
                          with the this dpmac.
Optional properties:

- iommu-map: 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).

Example:

        smmu: iommu@5000000 {
               compatible = "arm,mmu-500";
               #iommu-cells = <1>;
               stream-match-mask = <0x7C00>;
               ...
        };

        fsl_mc: fsl-mc@80c000000 {
                compatible = "fsl,qoriq-mc";
                reg = <0x00000008 0x0c000000 0 0x40>,    /* MC portal base */
                      <0x00000000 0x08340000 0 0x40000>; /* MC control reg */
                msi-parent = <&its>;
                /* define map for ICIDs 23-64 */
                iommu-map = <23 &smmu 23 41>;
                #address-cells = <3>;
                #size-cells = <1>;

                /*
                 * Region type 0x0 - MC portals
                 * Region type 0x1 - QBMAN portals
                 */
                ranges = <0x0 0x0 0x0 0x8 0x0c000000 0x4000000
                          0x1 0x0 0x0 0x8 0x18000000 0x8000000>;

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

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