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


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

    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@arm.com>
    >> Cc: Rob Herring <robh+dt@kernel.org>
    >> Cc: Mark Rutland <mark.rutland@arm.com>
    >> CC: Jassi Brar <jassisinghbrar@gmail.com>
    >> Cc: Liviu Dudau <Liviu.Dudau@arm.com>
    >> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
    >> Cc: Jon Medhurst (Tixy) <tixy@linaro.org>
    >> Cc: devicetree@vger.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.
    >

    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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