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Message-Id: <20210712141833.6628-17-cristian.marussi@arm.com>
Date: Mon, 12 Jul 2021 15:18:32 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
virtualization@...ts.linux-foundation.org,
virtio-dev@...ts.oasis-open.org
Cc: sudeep.holla@....com, james.quinlan@...adcom.com,
Jonathan.Cameron@...wei.com, f.fainelli@...il.com,
etienne.carriere@...aro.org, vincent.guittot@...aro.org,
souvik.chakravarty@....com, cristian.marussi@....com,
igor.skalkin@...nsynergy.com, peter.hilber@...nsynergy.com,
alex.bennee@...aro.org, jean-philippe@...aro.org,
mikhail.golubev@...nsynergy.com, anton.yakovlev@...nsynergy.com,
Vasyl.Vavrychuk@...nsynergy.com,
Andriy.Tryshnivskyy@...nsynergy.com
Subject: [PATCH v6 16/17] dt-bindings: arm: Add virtio transport for SCMI
From: Igor Skalkin <igor.skalkin@...nsynergy.com>
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
Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Igor Skalkin <igor.skalkin@...nsynergy.com>
[ Peter: Adapted patch for submission to upstream. ]
Co-developed-by: Peter Hilber <peter.hilber@...nsynergy.com>
Signed-off-by: Peter Hilber <peter.hilber@...nsynergy.com>
[ Cristian: converted to yaml format, moved shmen required property. ]
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
v3 --> V4
- convertd to YAML
- make shmem required only for pre-existing mailbox and smc transport
- updated VirtIO specification patch message reference
- dropped virtio-mmio SCMI device example since really not pertinent to
virtio-scmi dt bindings transport: it is not even referenced in SCMI
virtio DT node since they are enumerated by VirtIO subsystem and there
could be PCI based SCMI devices anyway.
---
Documentation/devicetree/bindings/firmware/arm,scmi.yaml | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
index cebf6ffe70d5..5c4c6782e052 100644
--- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
+++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
@@ -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:
- |
--
2.17.1
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