# SPDX-License-Identifier: GPL-2.0-only menu "ARM System Control and Management Interface Protocol" config ARM_SCMI_PROTOCOL tristate "ARM System Control and Management Interface (SCMI) Message Protocol" depends on ARM || ARM64 || COMPILE_TEST help ARM System Control and Management Interface (SCMI) protocol is a set of operating system-independent software interfaces that are used in system management. SCMI is extensible and currently provides interfaces for: Discovery and self-description of the interfaces it supports, Power domain management which is the ability to place a given device or domain into the various power-saving states that it supports, Performance management which is the ability to control the performance of a domain that is composed of compute engines such as application processors and other accelerators, Clock management which is the ability to set and inquire rates on platform managed clocks and Sensor management which is the ability to read sensor data, and be notified of sensor value. This protocol library provides interface for all the client drivers making use of the features offered by the SCMI. if ARM_SCMI_PROTOCOL config ARM_SCMI_NEED_DEBUGFS bool help This declares whether at least one SCMI facility is configured which needs debugfs support. When selected causess the creation of a common SCMI debugfs root directory. config ARM_SCMI_RAW_MODE_SUPPORT bool "Enable support for SCMI Raw transmission mode" depends on DEBUG_FS select ARM_SCMI_NEED_DEBUGFS help Enable support for SCMI Raw transmission mode. If enabled allows the direct injection and snooping of SCMI bare messages through a dedicated debugfs interface. It is meant to be used by SCMI compliance/testing suites. When enabled regular SCMI drivers interactions are inhibited in order to avoid unexpected interactions with the SCMI Raw message flow. If unsure say N. config ARM_SCMI_RAW_MODE_SUPPORT_COEX bool "Allow SCMI Raw mode coexistence with normal SCMI stack" depends on ARM_SCMI_RAW_MODE_SUPPORT help Allow SCMI Raw transmission mode to coexist with normal SCMI stack. This will allow regular SCMI drivers to register with the core and operate normally, thing which could make an SCMI test suite using the SCMI Raw mode support unreliable. If unsure, say N. config ARM_SCMI_HAVE_TRANSPORT bool help This declares whether at least one SCMI transport has been configured. Used to trigger a build bug when trying to build SCMI without any configured transport. config ARM_SCMI_HAVE_SHMEM bool help This declares whether a shared memory based transport for SCMI is available. config ARM_SCMI_HAVE_MSG bool help This declares whether a message passing based transport for SCMI is available. config ARM_SCMI_TRANSPORT_MAILBOX bool "SCMI transport based on Mailbox" depends on MAILBOX select ARM_SCMI_HAVE_TRANSPORT select ARM_SCMI_HAVE_SHMEM default y help Enable mailbox based transport for SCMI. If you want the ARM SCMI PROTOCOL stack to include support for a transport based on mailboxes, answer Y. config ARM_SCMI_TRANSPORT_OPTEE bool "SCMI transport based on OP-TEE service" depends on OPTEE=y || OPTEE=ARM_SCMI_PROTOCOL select ARM_SCMI_HAVE_TRANSPORT select ARM_SCMI_HAVE_SHMEM select ARM_SCMI_HAVE_MSG default y help This enables the OP-TEE service based transport for SCMI. If you want the ARM SCMI PROTOCOL stack to include support for a transport based on OP-TEE SCMI service, answer Y. config ARM_SCMI_TRANSPORT_SMC bool "SCMI transport based on SMC" depends on HAVE_ARM_SMCCC_DISCOVERY select ARM_SCMI_HAVE_TRANSPORT select ARM_SCMI_HAVE_SHMEM default y help Enable SMC based transport for SCMI. If you want the ARM SCMI PROTOCOL stack to include support for a transport based on SMC, answer Y. config ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE bool "Enable atomic mode support for SCMI SMC transport" depends on ARM_SCMI_TRANSPORT_SMC help Enable support of atomic operation for SCMI SMC based transport. If you want the SCMI SMC based transport to operate in atomic mode, avoiding any kind of sleeping behaviour for selected transactions on the TX path, answer Y. Enabling atomic mode operations allows any SCMI driver using this transport to optionally ask for atomic SCMI transactions and operate in atomic context too, at the price of using a number of busy-waiting primitives all over instead. If unsure say N. config ARM_SCMI_TRANSPORT_VIRTIO bool "SCMI transport based on VirtIO" depends on VIRTIO=y || VIRTIO=ARM_SCMI_PROTOCOL select ARM_SCMI_HAVE_TRANSPORT select ARM_SCMI_HAVE_MSG help This enables the virtio based transport for SCMI. If you want the ARM SCMI PROTOCOL stack to include support for a transport based on VirtIO, answer Y. config ARM_SCMI_TRANSPORT_VIRTIO_VERSION1_COMPLIANCE bool "SCMI VirtIO transport Version 1 compliance" depends on ARM_SCMI_TRANSPORT_VIRTIO default y help This enforces strict compliance with VirtIO Version 1 specification. If you want the ARM SCMI VirtIO transport layer to refuse to work with Legacy VirtIO backends and instead support only VirtIO Version 1 devices (or above), answer Y. If you want instead to support also old Legacy VirtIO backends (like the ones implemented by kvmtool) and let the core Kernel VirtIO layer take care of the needed conversions, say N. config ARM_SCMI_TRANSPORT_VIRTIO_ATOMIC_ENABLE bool "Enable atomic mode for SCMI VirtIO transport" depends on ARM_SCMI_TRANSPORT_VIRTIO help Enable support of atomic operation for SCMI VirtIO based transport. If you want the SCMI VirtIO based transport to operate in atomic mode, avoiding any kind of sleeping behaviour for selected transactions on the TX path, answer Y. Enabling atomic mode operations allows any SCMI driver using this transport to optionally ask for atomic SCMI transactions and operate in atomic context too, at the price of using a number of busy-waiting primitives all over instead. If unsure say N. endif #ARM_SCMI_PROTOCOL config ARM_SCMI_POWER_DOMAIN tristate "SCMI power domain driver" depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) default y select PM_GENERIC_DOMAINS if PM help This enables support for the SCMI power domains which can be enabled or disabled via the SCP firmware This driver can also be built as a module. If so, the module will be called scmi_pm_domain. Note this may needed early in boot before rootfs may be available. config ARM_SCMI_POWER_CONTROL tristate "SCMI system power control driver" depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) help This enables System Power control logic which binds system shutdown or reboot actions to SCMI System Power notifications generated by SCP firmware. This driver can also be built as a module. If so, the module will be called scmi_power_control. Note this may needed early in boot to catch early shutdown/reboot SCMI requests. endmenu