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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