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authorLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 21:29:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 21:29:35 -0700
commit38c23685b273cfb4ccf31a199feccce3bdcb5d83 (patch)
tree6b693a36c6ea6c64aaaf34112c57e89f1b5c4b0f /Documentation/arm
parent167569343fac74ec6825a3ab982f795b5880e63e (diff)
parent7df3f0bb5f90e3470de2798452000e221420059c (diff)
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Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC driver updates from Arnd Bergmann: "The main addition this time around is the new ARM "SCMI" framework, which is the latest in a series of standards coming from ARM to do power management in a platform independent way. This has been through many review cycles, and it relies on a rather interesting way of using the mailbox subsystem, but in the end I agreed that Sudeep's version was the best we could do after all. Other changes include: - the ARM CCN driver is moved out of drivers/bus into drivers/perf, which makes more sense. Similarly, the performance monitoring portion of the CCI driver are moved the same way and cleaned up a little more. - a series of updates to the SCPI framework - support for the Mediatek mt7623a SoC in drivers/soc - support for additional NVIDIA Tegra hardware in drivers/soc - a new reset driver for Socionext Uniphier - lesser bug fixes in drivers/soc, drivers/tee, drivers/memory, and drivers/firmware and drivers/reset across platforms" * tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (87 commits) reset: uniphier: add ethernet reset control support for PXs3 reset: stm32mp1: Enable stm32mp1 reset driver dt-bindings: reset: add STM32MP1 resets reset: uniphier: add Pro4/Pro5/PXs2 audio systems reset control reset: imx7: add 'depends on HAS_IOMEM' to fix unmet dependency reset: modify the way reset lookup works for board files reset: add support for non-DT systems clk: scmi: use devm_of_clk_add_hw_provider() API and drop scmi_clocks_remove firmware: arm_scmi: prevent accessing rate_discrete uninitialized hwmon: (scmi) return -EINVAL when sensor information is unavailable amlogic: meson-gx-socinfo: Update soc ids soc/tegra: pmc: Use the new reset APIs to manage reset controllers soc: mediatek: update power domain data of MT2712 dt-bindings: soc: update MT2712 power dt-bindings cpufreq: scmi: add thermal dependency soc: mediatek: fix the mistaken pointer accessed when subdomains are added soc: mediatek: add SCPSYS power domain driver for MediaTek MT7623A SoC soc: mediatek: avoid hardcoded value with bus_prot_mask dt-bindings: soc: add header files required for MT7623A SCPSYS dt-binding dt-bindings: soc: add SCPSYS binding for MT7623 and MT7623A SoC ...
Diffstat (limited to 'Documentation/arm')
-rw-r--r--Documentation/arm/CCN.txt59
1 files changed, 0 insertions, 59 deletions
diff --git a/Documentation/arm/CCN.txt b/Documentation/arm/CCN.txt
deleted file mode 100644
index 15cdb7bc57c3..000000000000
--- a/Documentation/arm/CCN.txt
+++ /dev/null
@@ -1,59 +0,0 @@
-ARM Cache Coherent Network
-==========================
-
-CCN-504 is a ring-bus interconnect consisting of 11 crosspoints
-(XPs), with each crosspoint supporting up to two device ports,
-so nodes (devices) 0 and 1 are connected to crosspoint 0,
-nodes 2 and 3 to crosspoint 1 etc.
-
-PMU (perf) driver
------------------
-
-The CCN driver registers a perf PMU driver, which provides
-description of available events and configuration options
-in sysfs, see /sys/bus/event_source/devices/ccn*.
-
-The "format" directory describes format of the config, config1
-and config2 fields of the perf_event_attr structure. The "events"
-directory provides configuration templates for all documented
-events, that can be used with perf tool. For example "xp_valid_flit"
-is an equivalent of "type=0x8,event=0x4". Other parameters must be
-explicitly specified.
-
-For events originating from device, "node" defines its index.
-
-Crosspoint PMU events require "xp" (index), "bus" (bus number)
-and "vc" (virtual channel ID).
-
-Crosspoint watchpoint-based events (special "event" value 0xfe)
-require "xp" and "vc" as as above plus "port" (device port index),
-"dir" (transmit/receive direction), comparator values ("cmp_l"
-and "cmp_h") and "mask", being index of the comparator mask.
-Masks are defined separately from the event description
-(due to limited number of the config values) in the "cmp_mask"
-directory, with first 8 configurable by user and additional
-4 hardcoded for the most frequent use cases.
-
-Cycle counter is described by a "type" value 0xff and does
-not require any other settings.
-
-The driver also provides a "cpumask" sysfs attribute, which contains
-a single CPU ID, of the processor which will be used to handle all
-the CCN PMU events. It is recommended that the user space tools
-request the events on this processor (if not, the perf_event->cpu value
-will be overwritten anyway). In case of this processor being offlined,
-the events are migrated to another one and the attribute is updated.
-
-Example of perf tool use:
-
-/ # perf list | grep ccn
- ccn/cycles/ [Kernel PMU event]
-<...>
- ccn/xp_valid_flit,xp=?,port=?,vc=?,dir=?/ [Kernel PMU event]
-<...>
-
-/ # perf stat -a -e ccn/cycles/,ccn/xp_valid_flit,xp=1,port=0,vc=1,dir=1/ \
- sleep 1
-
-The driver does not support sampling, therefore "perf record" will
-not work. Per-task (without "-a") perf sessions are not supported.