linux-kernel - Re: [PATCH v2 1/2] dt-bindings: arm: Add optional interrupt to smc/hvc SCMI transport

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Message-ID: <20201207190127.GA617336@robh.at.kernel.org>
Date:   Mon, 7 Dec 2020 13:01:27 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jim Quinlan <james.quinlan@...adcom.com>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        bcm-kernel-feedback-list@...adcom.com,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] dt-bindings: arm: Add optional interrupt to
 smc/hvc SCMI transport

On Thu, Nov 12, 2020 at 12:56:26PM -0500, Jim Quinlan wrote:
> In normal use of smc/hvc transport in SCMI the message completion is
> indicated by the return of the SMC call.  This commit provides for an
> optional interrupt named "message-serviced" which is used instead to
> indicate the completion of a message.
> 
> Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> ---
>  Documentation/devicetree/bindings/arm/arm,scmi.txt | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt b/Documentation/devicetree/bindings/arm/arm,scmi.txt
> index 55deb68230eb..7cdad11f40b1 100644
> --- a/Documentation/devicetree/bindings/arm/arm,scmi.txt
> +++ b/Documentation/devicetree/bindings/arm/arm,scmi.txt
> @@ -31,6 +31,14 @@ Optional properties:
>  
>  - mbox-names: shall be "tx" or "rx" depending on mboxes entries.
>  
> +- interrupts : when using smc or hvc transports, this optional
> +	 property indicates that msg completion by the platform is indicated
> +	 by an interrupt rather than by the return of the smc call. This
> +	 should not be used except when the platform requires such behavior.
> +
> +- interrupt-names : if "interrupts" is present, interrupt-names must also
> +	 be present and have the value "message-serviced".

Don't really need names when only one, but wouldn't 'a2p' be more 
concise and based on SCMI spec (just guessing...).

> +
>  See Documentation/devicetree/bindings/mailbox/mailbox.txt for more details
>  about the generic mailbox controller and client driver bindings.
>  
> -- 
> 2.17.1
>