linux-kernel - Re: [PATCH 1/4] mailbox: add support for System Control and Power Interface(SCPI) protocol

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Message-ID: <CABb+yY1KcrDNrhCHae=B7D+9jv2MEOqwF0VhDRKnZu7ATGfv2A@mail.gmail.com>
Date:	Wed, 13 May 2015 22:22:41 +0530
From:	Jassi Brar <jassisinghbrar@...il.com>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Devicetree List <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/4] mailbox: add support for System Control and Power
 Interface(SCPI) protocol

On Mon, Apr 27, 2015 at 5:10 PM, Sudeep Holla <sudeep.holla@....com> wrote:
> This patch adds support for System Control and Power Interface (SCPI)
> Message Protocol used between the Application Cores(AP) and the System
> Control Processor(SCP). The MHU peripheral provides a mechanism for
> inter-processor communication between SCP's M3 processor and AP.
>
> SCP offers control and management of the core/cluster power states,
> various power domain DVFS including the core/cluster, certain system
> clocks configuration, thermal sensors and many others.
>
> This protocol driver provides interface for all the client drivers using
> SCPI to make use of the features offered by the SCP.
>
Is the SCPI specification available somewhere to look into?

> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> CC: Jassi Brar <jassisinghbrar@...il.com>
> Cc: Liviu Dudau <Liviu.Dudau@....com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: Jon Medhurst (Tixy) <tixy@...aro.org>
> Cc: devicetree@...r.kernel.org
> ---
>  .../devicetree/bindings/mailbox/arm,scpi.txt       | 121 ++++
>  drivers/mailbox/Kconfig                            |  19 +
>  drivers/mailbox/Makefile                           |   2 +
>  drivers/mailbox/scpi_protocol.c                    | 694 +++++++++++++++++++++
>
Why in drivers/mailbox/ ? This is a 'consumer' driver and seems
Juno(ARM) specific.

-Jassi
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