linux-kernel - Re: [PATCH v3 03/22] dt-bindings: arm: scmi: add ARM MHU specific mailbox client bindings

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Message-ID: <20171005232031.7373ni5ssln4wlpr@rob-hp-laptop>
Date:   Thu, 5 Oct 2017 18:20:31 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     ALKML <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Roy Franz <roy.franz@...ium.com>,
        Harb Abdulhamid <harba@...eaurora.org>,
        Nishanth Menon <nm@...com>, Arnd Bergmann <arnd@...db.de>,
        Loc Ho <lho@....com>, Alexey Klimov <alexey.klimov@....com>,
        Ryan Harkin <Ryan.Harkin@....com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v3 03/22] dt-bindings: arm: scmi: add ARM MHU specific
 mailbox client bindings

On Thu, Sep 28, 2017 at 02:11:27PM +0100, Sudeep Holla wrote:
> This patch adds ARM MHU specific mailbox client bindings to support
> SCMI. Since SCMI specification just requires doorbell mechanism from
> mailbox controllers, we add mailbox data to specify the doorbell bit(s).
> 
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>  .../devicetree/bindings/arm/arm,mhu-scmi.txt          | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/arm,mhu-scmi.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/arm,mhu-scmi.txt b/Documentation/devicetree/bindings/arm/arm,mhu-scmi.txt
> new file mode 100644
> index 000000000000..8c106f1cdeb8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/arm,mhu-scmi.txt
> @@ -0,0 +1,19 @@
> +ARM MHU mailbox client bindings for SCMI Message Protocol
> +----------------------------------------------------------
> +
> +This binding is intended to define the ARM MHU specific extensions to
> +the generic SCMI bindings[2].
> +
> +Required properties:
> +
> +The scmi node with the following properties shall be under the /firmware/ node.
> +
> +- compatible : shall be "arm,scmi" and "arm,mhu-scmi"

Most specific first.

> +- mbox-data : For each phandle listed in mboxes property, an unsigned 32-bit
> +	      data as expected by the mailbox controller

Shouldn't that be cells as part of mboxes property?

> +
> +See [1] for details on all other required/optional properties of the generic
> +mailbox controller and [2] for generic SCMI bindings.
> +
> +[1] Documentation/devicetree/bindings/mailbox/mailbox.txt
> +[2] Documentation/devicetree/bindings/arm/arm,scmi.txt
> -- 
> 2.7.4
>