Hi Rob,

On 15/01/20 7:10 AM, Rob Herring wrote:

On Tue, Dec 31, 2019 at 05:05:29PM +0530, Kishon Vijay Abraham I wrote:

quoted

Add binding to specify maximum number of virtual functions that can be
associated with each physical function.

Signed-off-by: Kishon Vijay Abraham I <redacted>
---
 .../devicetree/bindings/pci/cdns,cdns-pcie-ep.txt         | 2 ++
 .../devicetree/bindings/pci/ti,j721e-pci-ep.yaml          | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-ep.txt b/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-ep.txt
index 4a0475e2ba7e..432578202733 100644
--- a/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-ep.txt
+++ b/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-ep.txt

@@ -9,6 +9,8 @@ Required properties:
 
 Optional properties:
 - max-functions: Maximum number of functions that can be configured (default 1).
+- max-virtual-functions: Maximum number of virtual functions that can be
+    associated with each physical function.
 - phys: From PHY bindings: List of Generic PHY phandles. One per lane if more
   than one in the list.  If only one PHY listed it must manage all lanes. 
 - phy-names:  List of names to identify the PHY.

diff --git a/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml b/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml
index 4621c62016c7..1d4964ba494f 100644
--- a/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml
+++ b/Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml

@@ -61,6 +61,12 @@ properties:
     minimum: 1
     maximum: 6
 
+  max-virtual-functions:
+    minItems: 1
+    maxItems: 6

Is there a PCIe spec limit to number of virtual functions per phy 
function? Or 2^32 virtual functions is okay.

The PCIe spec provides a 16 bit field to specify number of virtual
functions in the SR-IOV extended capability.

quoted

+    description: As defined in
+                 Documentation/devicetree/bindings/pci/cdns,cdns-pcie-ep.txt

I suspect this this be a common property.

Right now we don't have common EP property binding across all
controllers. Maybe should create one?

Thanks
Kishon

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