1# SPDX-License-Identifier: GPL-2.0-only 2menu "ARM System Control and Management Interface Protocol" 3 4config ARM_SCMI_PROTOCOL 5 tristate "ARM System Control and Management Interface (SCMI) Message Protocol" 6 depends on ARM || ARM64 || COMPILE_TEST 7 help 8 ARM System Control and Management Interface (SCMI) protocol is a 9 set of operating system-independent software interfaces that are 10 used in system management. SCMI is extensible and currently provides 11 interfaces for: Discovery and self-description of the interfaces 12 it supports, Power domain management which is the ability to place 13 a given device or domain into the various power-saving states that 14 it supports, Performance management which is the ability to control 15 the performance of a domain that is composed of compute engines 16 such as application processors and other accelerators, Clock 17 management which is the ability to set and inquire rates on platform 18 managed clocks and Sensor management which is the ability to read 19 sensor data, and be notified of sensor value. 20 21 This protocol library provides interface for all the client drivers 22 making use of the features offered by the SCMI. 23 24if ARM_SCMI_PROTOCOL 25 26config ARM_SCMI_HAVE_TRANSPORT 27 bool 28 help 29 This declares whether at least one SCMI transport has been configured. 30 Used to trigger a build bug when trying to build SCMI without any 31 configured transport. 32 33config ARM_SCMI_HAVE_SHMEM 34 bool 35 help 36 This declares whether a shared memory based transport for SCMI is 37 available. 38 39config ARM_SCMI_HAVE_MSG 40 bool 41 help 42 This declares whether a message passing based transport for SCMI is 43 available. 44 45config ARM_SCMI_TRANSPORT_MAILBOX 46 bool "SCMI transport based on Mailbox" 47 depends on MAILBOX 48 select ARM_SCMI_HAVE_TRANSPORT 49 select ARM_SCMI_HAVE_SHMEM 50 default y 51 help 52 Enable mailbox based transport for SCMI. 53 54 If you want the ARM SCMI PROTOCOL stack to include support for a 55 transport based on mailboxes, answer Y. 56 57config ARM_SCMI_TRANSPORT_OPTEE 58 bool "SCMI transport based on OP-TEE service" 59 depends on OPTEE=y || OPTEE=ARM_SCMI_PROTOCOL 60 select ARM_SCMI_HAVE_TRANSPORT 61 select ARM_SCMI_HAVE_SHMEM 62 default y 63 help 64 This enables the OP-TEE service based transport for SCMI. 65 66 If you want the ARM SCMI PROTOCOL stack to include support for a 67 transport based on OP-TEE SCMI service, answer Y. 68 69config ARM_SCMI_TRANSPORT_SMC 70 bool "SCMI transport based on SMC" 71 depends on HAVE_ARM_SMCCC_DISCOVERY 72 select ARM_SCMI_HAVE_TRANSPORT 73 select ARM_SCMI_HAVE_SHMEM 74 default y 75 help 76 Enable SMC based transport for SCMI. 77 78 If you want the ARM SCMI PROTOCOL stack to include support for a 79 transport based on SMC, answer Y. 80 81config ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE 82 bool "Enable atomic mode support for SCMI SMC transport" 83 depends on ARM_SCMI_TRANSPORT_SMC 84 help 85 Enable support of atomic operation for SCMI SMC based transport. 86 87 If you want the SCMI SMC based transport to operate in atomic 88 mode, avoiding any kind of sleeping behaviour for selected 89 transactions on the TX path, answer Y. 90 Enabling atomic mode operations allows any SCMI driver using this 91 transport to optionally ask for atomic SCMI transactions and operate 92 in atomic context too, at the price of using a number of busy-waiting 93 primitives all over instead. If unsure say N. 94 95config ARM_SCMI_TRANSPORT_VIRTIO 96 bool "SCMI transport based on VirtIO" 97 depends on VIRTIO=y || VIRTIO=ARM_SCMI_PROTOCOL 98 select ARM_SCMI_HAVE_TRANSPORT 99 select ARM_SCMI_HAVE_MSG 100 help 101 This enables the virtio based transport for SCMI. 102 103 If you want the ARM SCMI PROTOCOL stack to include support for a 104 transport based on VirtIO, answer Y. 105 106config ARM_SCMI_TRANSPORT_VIRTIO_VERSION1_COMPLIANCE 107 bool "SCMI VirtIO transport Version 1 compliance" 108 depends on ARM_SCMI_TRANSPORT_VIRTIO 109 default y 110 help 111 This enforces strict compliance with VirtIO Version 1 specification. 112 113 If you want the ARM SCMI VirtIO transport layer to refuse to work 114 with Legacy VirtIO backends and instead support only VirtIO Version 1 115 devices (or above), answer Y. 116 117 If you want instead to support also old Legacy VirtIO backends (like 118 the ones implemented by kvmtool) and let the core Kernel VirtIO layer 119 take care of the needed conversions, say N. 120 121config ARM_SCMI_TRANSPORT_VIRTIO_ATOMIC_ENABLE 122 bool "Enable atomic mode for SCMI VirtIO transport" 123 depends on ARM_SCMI_TRANSPORT_VIRTIO 124 help 125 Enable support of atomic operation for SCMI VirtIO based transport. 126 127 If you want the SCMI VirtIO based transport to operate in atomic 128 mode, avoiding any kind of sleeping behaviour for selected 129 transactions on the TX path, answer Y. 130 131 Enabling atomic mode operations allows any SCMI driver using this 132 transport to optionally ask for atomic SCMI transactions and operate 133 in atomic context too, at the price of using a number of busy-waiting 134 primitives all over instead. If unsure say N. 135 136endif #ARM_SCMI_PROTOCOL 137 138config ARM_SCMI_POWER_DOMAIN 139 tristate "SCMI power domain driver" 140 depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) 141 default y 142 select PM_GENERIC_DOMAINS if PM 143 help 144 This enables support for the SCMI power domains which can be 145 enabled or disabled via the SCP firmware 146 147 This driver can also be built as a module. If so, the module 148 will be called scmi_pm_domain. Note this may needed early in boot 149 before rootfs may be available. 150 151endmenu 152