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

[Sudeep Holla]

On 13/05/15 17:52, Jassi Brar wrote:
> On Mon, Apr 27, 2015 at 5:10 PM, Sudeep Holla <sudeep.holla@xxxxxxx> 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?

Yes sorry posted the link separately(as reply to Tixy in the cover
letter) since it was not available when I posted the patches.
You can grab the protocol @[1] or [2]

> > Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
> > Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> > Cc: Mark Rutland <mark.rutland@xxxxxxx>
> > CC: Jassi Brar <jassisinghbrar@xxxxxxxxx>
> > Cc: Liviu Dudau <Liviu.Dudau@xxxxxxx>
> > Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> > Cc: Jon Medhurst (Tixy) <tixy@xxxxxxxxxx>
> > Cc: devicetree@xxxxxxxxxxxxxxx
> > ---
> >   .../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.

Not just JUNO alone though it's first one to use, it will used in next
few platforms(foreseeable future) from ARM Ltd.

I have put that in drivers/mailbox for 2 reasons:
1. It's mailbox protocol :)
2. ARM64 doesn't have platform code like ARM32 and moreover it's
   strictly not specific to JUNO or any single platform. It may
   get reused on other platforms.

Regards,
Sudeep

[1] 
http://community.arm.com/servlet/JiveServlet/download/8401-40-18262/DUI0922A_scp_message_interface.pdf
[2] 
https://wiki.linaro.org/ARM/Juno?action=AttachFile&do=get&target=DUI0922A_scp_message_interface.pdf
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