Messages in this thread | | | Date | Wed, 13 May 2015 18:09:20 +0100 | From | Sudeep Holla <> | Subject | Re: [PATCH 1/4] mailbox: add support for System Control and Power Interface(SCPI) protocol |
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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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