dt-bindings: PCI: ti,am65: Extend for use with PVU

The Peripheral Virtualization Unit (PVU) on the AM65 SoC is capable of
restricting DMA from PCIe devices to specific regions of host memory.
Add the optional property "memory-regions" to point to such regions of
memory when PVU is used.

Since the PVU deals with system physical addresses, utilizing the PVU
with PCIe devices also requires setting up the VMAP registers to map the
Requester ID of the PCIe device to the CBA Virtual ID, which in turn is
mapped to the system physical address. Hence, describe the VMAP
registers which are optional unless the PVU shall be used for PCIe.

Signed-off-by: Jan Kiszka <[email protected]>
Signed-off-by: Li Hua Qian <[email protected]>
[mani: Expanded PVU in description]
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: jan-kiszka

Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml

@@ -20,14 +20,18 @@ properties:
       - ti,keystone-pcie
 
   reg:
-    maxItems: 4
+    minItems: 4
+    maxItems: 6
 
   reg-names:
+    minItems: 4
     items:
       - const: app
       - const: dbics
       - const: config
       - const: atu
+      - const: vmap_lp
+      - const: vmap_hp
 
   interrupts:
     maxItems: 1
@@ -69,6 +73,15 @@ properties:
     items:
       pattern: '^pcie-phy[0-1]$'
 
+  memory-region:
+    maxItems: 1
+    description: |
+      phandle to a restricted DMA pool to be used for all devices behind
+      this controller. The regions should be defined according to
+      reserved-memory/shared-dma-pool.yaml.
+      Note that enforcement via the PVU will only be available to
+      ti,am654-pcie-rc devices.
+
 required:
   - compatible
   - reg
@@ -89,6 +102,13 @@ then:
     - power-domains
     - msi-map
     - num-viewport
+else:
+  properties:
+    reg:
+      maxItems: 4
+
+    reg-names:
+      maxItems: 4
 
 unevaluatedProperties: false
 
@@ -104,8 +124,10 @@ examples:
         reg =  <0x5500000 0x1000>,
                <0x5501000 0x1000>,
                <0x10000000 0x2000>,
-               <0x5506000 0x1000>;
-        reg-names = "app", "dbics", "config", "atu";
+               <0x5506000 0x1000>,
+               <0x2900000 0x1000>,
+               <0x2908000 0x1000>;
+        reg-names = "app", "dbics", "config", "atu", "vmap_lp", "vmap_hp";
         power-domains = <&k3_pds 120 TI_SCI_PD_EXCLUSIVE>;
         #address-cells = <3>;
         #size-cells = <2>;