dt-bindings: arm: add support for ARM System Control and Management Interface(SCMI) protocol
This patch adds devicetree binding for System Control and Management Interface (SCMI) 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. SCMI protocol is developed as better replacement to the existing SCPI which is not flexible and easily extensible. Cc: Mark Rutland <mark.rutland@arm.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
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