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authorYijie Yang <yijie.yang@oss.qualcomm.com>2026-08-11 16:46:47 +0800
committerRob Herring (Arm) <robh@kernel.org>2026-08-15 15:46:52 -0500
commite1c13aed4a1641550e8c9518c96f016e1d52d09b (patch)
tree61c2297688373db165cc857b7c7adcb147a5c419 /Documentation/ABI/testing/debugfs-scmi-raw
downloadlinux-stable-e1c13aed4a1641550e8c9518c96f016e1d52d09b.tar.gz
linux-stable-e1c13aed4a1641550e8c9518c96f016e1d52d09b.zip
dt-bindings: interconnect: qcom-bwmon: Add Maili cpu-bwmon compatiblegrafted
Add the Qualcomm Maili SoC compatible string for the CPU bandwidth monitor (BWMONv4). This falls back to the sdm845-bwmon compatible, consistent with the existing pattern used by other recent SoCs such as sm8750 and kaanapali. Signed-off-by: Yijie Yang <yijie.yang@oss.qualcomm.com> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com> Reviewed-by: Jingyi Wang <jingyi.wang@oss.qualcomm.com> Link: https://patch.msgid.link/20260811-bwmon-v2-1-80f7f150ab9e@oss.qualcomm.com Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
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+What: /sys/kernel/debug/scmi/<n>/raw/message
+Date: March 2023
+KernelVersion: 6.3
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw synchronous message injection/snooping facility; write
+ a complete SCMI synchronous command message (header included)
+ in little-endian binary format to have it sent to the configured
+ backend SCMI server for instance <n>.
+ Any subsequently received response can be read from this same
+ entry if it arrived within the configured timeout.
+ Each write to the entry causes one command request to be built
+ and sent while the replies are read back one message at time
+ (receiving an EOF at each message boundary).
+Users: Debugging, any userspace test suite
+
+What: /sys/kernel/debug/scmi/<n>/raw/message_async
+Date: March 2023
+KernelVersion: 6.3
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw asynchronous message injection/snooping facility; write
+ a complete SCMI asynchronous command message (header included)
+ in little-endian binary format to have it sent to the configured
+ backend SCMI server for instance <n>.
+ Any subsequently received response can be read from this same
+ entry if it arrived within the configured timeout.
+ Any additional delayed response received afterwards can be read
+ from this same entry too if it arrived within the configured
+ timeout.
+ Each write to the entry causes one command request to be built
+ and sent while the replies are read back one message at time
+ (receiving an EOF at each message boundary).
+Users: Debugging, any userspace test suite
+
+What: /sys/kernel/debug/scmi/<n>/raw/message_poll
+Date: June 2025
+KernelVersion: 6.16
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw message injection/snooping facility using polling mode;
+ write a complete SCMI command message (header included) in
+ little-endian binary format to have it sent to the configured
+ backend SCMI server for instance <n>, using polling mode on
+ the reception path. (if transport is polling capable)
+ Any subsequently received response can be read from this same
+ entry if it arrived within the configured timeout.
+ Each write to the entry causes one command request to be built
+ and sent while the replies are read back one message at time
+ (receiving an EOF at each message boundary).
+Users: Debugging, any userspace test suite
+
+What: /sys/kernel/debug/scmi/<n>/raw/message_poll_async
+Date: June 2025
+KernelVersion: 6.16
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw asynchronous message injection/snooping facility using
+ polling-mode; write a complete SCMI asynchronous command message
+ (header included) in little-endian binary format to have it sent
+ to the configured backend SCMI server for instance <n>, using
+ polling-mode on the reception path of the immediate part of the
+ asynchronous command. (if transport is polling capable)
+ Any subsequently received response can be read from this same
+ entry if it arrived within the configured timeout.
+ Any additional delayed response received afterwards can be read
+ from this same entry too if it arrived within the configured
+ timeout.
+ Each write to the entry causes one command request to be built
+ and sent while the replies are read back one message at time
+ (receiving an EOF at each message boundary).
+Users: Debugging, any userspace test suite
+
+What: /sys/kernel/debug/scmi/<n>/raw/errors
+Date: March 2023
+KernelVersion: 6.3
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw message errors facility; any kind of timed-out or
+ generally unexpectedly received SCMI message, for instance <n>,
+ can be read from this entry.
+ Each read gives back one message at time (receiving an EOF at
+ each message boundary).
+Users: Debugging, any userspace test suite
+
+What: /sys/kernel/debug/scmi/<n>/raw/notification
+Date: March 2023
+KernelVersion: 6.3
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw notification snooping facility; any notification
+ emitted by the backend SCMI server, for instance <n>, can be
+ read from this entry.
+ Each read gives back one message at time (receiving an EOF at
+ each message boundary).
+Users: Debugging, any userspace test suite
+
+What: /sys/kernel/debug/scmi/<n>/raw/reset
+Date: March 2023
+KernelVersion: 6.3
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw stack reset facility; writing a value to this entry
+ causes the internal queues of any kind of received message,
+ still pending to be read out for instance <n>, to be immediately
+ flushed.
+ Can be used to reset and clean the SCMI Raw stack between to
+ different test-run.
+Users: Debugging, any userspace test suite
+
+What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message
+Date: March 2023
+KernelVersion: 6.3
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw synchronous message injection/snooping facility; write
+ a complete SCMI synchronous command message (header included)
+ in little-endian binary format to have it sent to the configured
+ backend SCMI server for instance <n> through the <m> transport
+ channel.
+ Any subsequently received response can be read from this same
+ entry if it arrived on channel <m> within the configured
+ timeout.
+ Each write to the entry causes one command request to be built
+ and sent while the replies are read back one message at time
+ (receiving an EOF at each message boundary).
+ Channel identifier <m> matches the SCMI protocol number which
+ has been associated with this transport channel in the DT
+ description, with base protocol number 0x10 being the default
+ channel for this instance.
+ Note that these per-channel entries rooted at <..>/channels
+ exist only if the transport is configured to have more than
+ one default channel.
+Users: Debugging, any userspace test suite
+
+What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message_async
+Date: March 2023
+KernelVersion: 6.3
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw asynchronous message injection/snooping facility; write
+ a complete SCMI asynchronous command message (header included)
+ in little-endian binary format to have it sent to the configured
+ backend SCMI server for instance <n> through the <m> transport
+ channel.
+ Any subsequently received response can be read from this same
+ entry if it arrived on channel <m> within the configured
+ timeout.
+ Any additional delayed response received afterwards can be read
+ from this same entry too if it arrived within the configured
+ timeout.
+ Each write to the entry causes one command request to be built
+ and sent while the replies are read back one message at time
+ (receiving an EOF at each message boundary).
+ Channel identifier <m> matches the SCMI protocol number which
+ has been associated with this transport channel in the DT
+ description, with base protocol number 0x10 being the default
+ channel for this instance.
+ Note that these per-channel entries rooted at <..>/channels
+ exist only if the transport is configured to have more than
+ one default channel.
+Users: Debugging, any userspace test suite
+
+
+What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message_poll
+Date: June 2025
+KernelVersion: 6.16
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw message injection/snooping facility using polling mode;
+ write a complete SCMI command message (header included) in
+ little-endian binary format to have it sent to the configured
+ backend SCMI server for instance <n> through the <m> transport
+ channel, using polling mode on the reception path.
+ (if transport is polling capable)
+ Any subsequently received response can be read from this same
+ entry if it arrived on channel <m> within the configured
+ timeout.
+ Each write to the entry causes one command request to be built
+ and sent while the replies are read back one message at time
+ (receiving an EOF at each message boundary).
+ Channel identifier <m> matches the SCMI protocol number which
+ has been associated with this transport channel in the DT
+ description, with base protocol number 0x10 being the default
+ channel for this instance.
+ Note that these per-channel entries rooted at <..>/channels
+ exist only if the transport is configured to have more than
+ one default channel.
+Users: Debugging, any userspace test suite
+
+What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message_poll_async
+Date: June 2025
+KernelVersion: 6.16
+Contact: cristian.marussi@arm.com
+Description: SCMI Raw asynchronous message injection/snooping facility using
+ polling-mode; write a complete SCMI asynchronous command message
+ (header included) in little-endian binary format to have it sent
+ to the configured backend SCMI server for instance <n> through
+ the <m> transport channel, using polling mode on the reception
+ path of the immediate part of the asynchronous command.
+ (if transport is polling capable)
+ Any subsequently received response can be read from this same
+ entry if it arrived on channel <m> within the configured
+ timeout.
+ Any additional delayed response received afterwards can be read
+ from this same entry too if it arrived within the configured
+ timeout.
+ Each write to the entry causes one command request to be built
+ and sent while the replies are read back one message at time
+ (receiving an EOF at each message boundary).
+ Channel identifier <m> matches the SCMI protocol number which
+ has been associated with this transport channel in the DT
+ description, with base protocol number 0x10 being the default
+ channel for this instance.
+ Note that these per-channel entries rooted at <..>/channels
+ exist only if the transport is configured to have more than
+ one default channel.
+Users: Debugging, any userspace test suite