disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt
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@@ -9,6 +9,35 @@
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 such as network interfaces, crypto accelerator instances, L2 switches,
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 etc.
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+For an overview of the DPAA2 architecture and fsl-mc bus see:
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+Documentation/networking/device_drivers/ethernet/freescale/dpaa2/overview.rst
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+
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+As described in the above overview, all DPAA2 objects in a DPRC share the
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+same hardware "isolation context" and a 10-bit value called an ICID
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+(isolation context id) is expressed by the hardware to identify
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+the requester.
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+
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+The generic 'iommus' property is insufficient to describe the relationship
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+between ICIDs and IOMMUs, so an iommu-map property is used to define
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+the set of possible ICIDs under a root DPRC and how they map to
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+an IOMMU.
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+
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+For generic IOMMU bindings, see
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+Documentation/devicetree/bindings/iommu/iommu.txt.
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+
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+For arm-smmu binding, see:
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+Documentation/devicetree/bindings/iommu/arm,smmu.yaml.
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+
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+The MSI writes are accompanied by sideband data which is derived from the ICID.
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+The msi-map property is used to associate the devices with both the ITS
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+controller and the sideband data which accompanies the writes.
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+
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+For generic MSI bindings, see
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+Documentation/devicetree/bindings/interrupt-controller/msi.txt.
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+
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+For GICv3 and GIC ITS bindings, see:
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+Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml.
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+
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 Required properties:
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     - compatible
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                        -the second region is the MC control registers. This
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                         region may not be present in some scenarios, such
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                         as in the device tree presented to a virtual machine.
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-
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-    - msi-parent
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-        Value type: <phandle>
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-        Definition: Must be present and point to the MSI controller node
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-                    handling message interrupts for the MC.
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     - ranges
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         Value type: <prop-encoded-array>
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               Value type: <phandle>
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               Definition: Specifies the phandle to the PHY device node associated
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                           with the this dpmac.
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+Optional properties:
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+
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+- iommu-map: Maps an ICID to an IOMMU and associated iommu-specifier
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+  data.
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+
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+  The property is an arbitrary number of tuples of
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+  (icid-base,iommu,iommu-base,length).
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+
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+  Any ICID i in the interval [icid-base, icid-base + length) is
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+  associated with the listed IOMMU, with the iommu-specifier
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+  (i - icid-base + iommu-base).
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+
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+- msi-map: Maps an ICID to a GIC ITS and associated msi-specifier
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+  data.
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+
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+  The property is an arbitrary number of tuples of
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+  (icid-base,gic-its,msi-base,length).
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+
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+  Any ICID in the interval [icid-base, icid-base + length) is
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+  associated with the listed GIC ITS, with the msi-specifier
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+  (i - icid-base + msi-base).
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+
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+Deprecated properties:
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+
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+    - msi-parent
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+        Value type: <phandle>
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+        Definition: Describes the MSI controller node handling message
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+                    interrupts for the MC. When there is no translation
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+                    between the ICID and deviceID this property can be used
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+                    to describe the MSI controller used by the devices on the
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+                    mc-bus.
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+                    The use of this property for mc-bus is deprecated. Please
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+                    use msi-map.
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 Example:
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+
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+        smmu: iommu@5000000 {
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+               compatible = "arm,mmu-500";
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+               #iommu-cells = <1>;
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+               stream-match-mask = <0x7C00>;
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+               ...
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+        };
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+
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+        gic: interrupt-controller@6000000 {
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+               compatible = "arm,gic-v3";
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+               ...
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+        }
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+        its: gic-its@6020000 {
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+               compatible = "arm,gic-v3-its";
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+               msi-controller;
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+               ...
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+        };
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         fsl_mc: fsl-mc@80c000000 {
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                 compatible = "fsl,qoriq-mc";
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                 reg = <0x00000008 0x0c000000 0 0x40>,    /* MC portal base */
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                       <0x00000000 0x08340000 0 0x40000>; /* MC control reg */
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-                msi-parent = <&its>;
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+                /* define map for ICIDs 23-64 */
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+                iommu-map = <23 &smmu 23 41>;
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+                /* define msi map for ICIDs 23-64 */
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+                msi-map = <23 &its 23 41>;
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                 #address-cells = <3>;
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                 #size-cells = <1>;
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