Commit 60625667 authored by Igor Skalkin's avatar Igor Skalkin Committed by Sudeep Holla
Browse files

dt-bindings: arm: Add virtio transport for SCMI 

Document the properties for arm,scmi-virtio compatible nodes.
The backing virtio SCMI device is described in patch [1].

While doing that, make shmem property required only for pre-existing
mailbox and smc transports, since virtio-scmi does not need it.

[1] https://lists.oasis-open.org/archives/virtio-comment/202102/msg00018.html

Link: https://lore.kernel.org/r/20210803131024.40280-14-cristian.marussi@arm.com


Co-developed-by: default avatarPeter Hilber <peter.hilber@opensynergy.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarIgor Skalkin <igor.skalkin@opensynergy.com>
[ Peter: Adapted patch for submission to upstream. ]
Signed-off-by: default avatarPeter Hilber <peter.hilber@opensynergy.com>
[ Cristian: converted to yaml format, moved shmen required property. ]
Signed-off-by: default avatarCristian Marussi <cristian.marussi@arm.com>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
parent 78852812

Documentation/devicetree/bindings/firmware/arm,scmi.yaml

+7 −1
Original line number Diff line number Diff line
@@ -34,6 +34,10 @@ properties: 
      - description: SCMI compliant firmware with ARM SMC/HVC transport

        items:

          - const: arm,scmi-smc

      - description: SCMI compliant firmware with SCMI Virtio transport.

                     The virtio transport only supports a single device.

        items:

          - const: arm,scmi-virtio



  interrupts:

    description:
@@ -172,6 +176,7 @@ patternProperties: 
      Each sub-node represents a protocol supported. If the platform

      supports a dedicated communication channel for a particular protocol,

      then the corresponding transport properties must be present.

      The virtio transport does not support a dedicated communication channel.



    properties:

      reg:
@@ -195,7 +200,6 @@ patternProperties: 


required:

  - compatible

  - shmem



if:

  properties:
@@ -209,6 +213,7 @@ then: 


  required:

    - mboxes

    - shmem



else:

  if:
@@ -219,6 +224,7 @@ else: 
  then:

    required:

      - arm,smc-id

      - shmem



examples:

  - |