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Message-ID: <e7fbfdfb-5368-f861-98c4-058d835779fc@opensynergy.com>
Date: Thu, 1 Jul 2021 10:43:02 +0200
From: Peter Hilber <peter.hilber@...nsynergy.com>
To: Cristian Marussi <cristian.marussi@....com>,
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, igor.skalkin@...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,
Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 13/16] dt-bindings: arm: Add virtio transport for SCMI
On 11.06.21 18:59, Cristian Marussi wrote:
> 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
>
> CC: Rob Herring <robh+dt@...nel.org>
> CC: devicetree@...r.kernel.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. ]
> Co-developed-by: Cristian Marussi <cristian.marussi@....com>
> 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:
> - |
>
Maybe a minimal example for arm,scmi-virtio could be added, such as below:
diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
index 5c4c6782e052..576faf970c1b 100644
--- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
+++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
@@ -344,4 +344,19 @@ examples:
};
};
+ - |
+ firmware {
+ scmi {
+ compatible = "arm,scmi-virtio";
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ scmi_devpd2: protocol@11 {
+ reg = <0x11>;
+ #power-domain-cells = <1>;
+ };
+ };
+ };
+
...
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