linux-kernel - RE: [PATCH 1/2] dt-bindings: arm: arm,scmi: add smc/hvc transports

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Date:   Mon, 10 Feb 2020 00:59:43 +0000
From:   Peng Fan <peng.fan@....com>
To:     "sudeep.holla@....com" <sudeep.holla@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>
CC:     "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "andre.przywara@....com" <andre.przywara@....com>
Subject: RE: [PATCH 1/2] dt-bindings: arm: arm,scmi: add smc/hvc transports

> Subject: [PATCH 1/2] dt-bindings: arm: arm,scmi: add smc/hvc transports
> 
> From: Peng Fan <peng.fan@....com>
> 
> SCMI could use SMC/HVC as tranports, so add into devicetree binding doc.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  Documentation/devicetree/bindings/arm/arm,scmi.txt | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt
> b/Documentation/devicetree/bindings/arm/arm,scmi.txt
> index f493d69e6194..03cff8b55a93 100644
> --- a/Documentation/devicetree/bindings/arm/arm,scmi.txt
> +++ b/Documentation/devicetree/bindings/arm/arm,scmi.txt
> @@ -14,7 +14,7 @@ Required properties:
> 
>  The scmi node with the following properties shall be under the /firmware/
> node.
> 
> -- compatible : shall be "arm,scmi"
> +- compatible : shall be "arm,scmi" or "arm,scmi-smc"

One question here, are you fine with compatible "arm,scmi-smc" or
add a new property 'transport' such as:
transport = "mailbox"; for mailbox
transport = "smc"; for smc and hvc.

Thanks,
Peng.

>  - mboxes: List of phandle and mailbox channel specifiers. It should contain
>  	  exactly one or two mailboxes, one for transmitting messages("tx")
>  	  and another optional for receiving the notifications("rx") if @@ -25,6
> +25,8 @@ The scmi node with the following properties shall be under the
> /firmware/ node.
>  	  protocol identifier for a given sub-node.
>  - #size-cells : should be '0' as 'reg' property doesn't have any size
>  	  associated with it.
> +- arm,smc-id : SMC id required when using smc transports
> +- arm,hvc-id : HVC id required when using hvc transports
> 
>  Optional properties:
> 
> --
> 2.16.4