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Mark Rutland 4155fc07fa Doc: dt: arch_timer: discourage clock-frequency use 
The ARM Generic Timer (AKA the architected timer, arm_arch_timer)
features a CPU register (CNTFRQ) which firmware is intended to
initialize, and non-secure software can read to determine the frequency
of the timer. On CPUs with secure state, this register cannot be written
from non-secure states.

The firmware of early SoCs featuring the timer did not correctly
initialize CNTFRQ correctly on all CPUs, requiring the frequency to be
described in DT as a workaround. This workaround is not complete however
as it is exposed to all software in a privileged non-secure mode
(including guests running under a hypervisor). The firmware and DTs for
recent SoCs have followed the example set by these early SoCs.

This patch updates the arch timer binding documentation to make it
clearer that the use of the clock-frequency property is a poor
work-around. The MMIO generic timer binding is similarly updated, though
this is less of a concern as there is generally no need to expose the
MMIO timers to guest OSs.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
 		2015-04-16 09:08:45 -05:00
..
ABI platform-drivers-x86 for 3.20 2015-02-19 10:56:51 -08:00
DocBook KGDB/KDB New: 2015-02-20 15:13:29 -08:00
EDID drm: Add 800x600 (SVGA) screen resolution to the built-in EDIDs 2014-05-26 12:53:40 +10:00
PCI doc: replace "practise" with "practice" in Documentation 2014-06-19 15:28:56 +02:00
RCU Merge branches 'doc.2015.01.07a', 'fixes.2015.01.15a', 'preempt.2015.01.06a', 'srcu.2015.01.06a', 'stall.2015.01.16a' and 'torture.2015.01.11a' into HEAD 2015-01-15 23:34:34 -08:00
accounting Documentation: use subdir-y to avoid unnecessary built-in.o files 2014-09-26 11:02:55 +02:00
acpi ACPI / Documentation: add a missing '=' 2015-01-22 01:21:45 +01:00
aoe
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arm ARM: SoC platform changes 2015-02-17 09:27:54 -08:00
arm64 arm64: Emulate SETEND for AArch32 tasks 2015-01-23 17:11:44 +00:00
auxdisplay Documentation: use subdir-y to avoid unnecessary built-in.o files 2014-09-26 11:02:55 +02:00
backlight
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blackfin Documentation: fix blackfin gptimers-example build errors 2015-01-28 12:07:58 -07:00
block Merge branch 'for-3.19/core' of git://git.kernel.dk/linux-block 2014-12-13 14:14:23 -08:00
blockdev zram: report maximum used memory 2014-10-09 22:26:02 -04:00
bus-devices
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cdrom
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cgroups mm: memcontrol: use "max" instead of "infinity" in control knobs 2015-02-28 09:57:51 -08:00
connector w1: optional bundling of netlink kernel replies 2014-05-27 13:56:21 -07:00
console
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cpu-freq intel_pstate: Add num_pstates to sysfs 2015-01-30 01:52:17 +01:00
cpuidle
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cris
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crypto crypto: doc - userspace interface spec 2014-11-13 22:31:38 +08:00
development-process Documentation: remove outdated references to the linux-next wiki 2014-10-28 09:06:11 -04:00
device-mapper dm crypt: add 'submit_from_crypt_cpus' option 2015-02-16 11:11:15 -05:00
devicetree Doc: dt: arch_timer: discourage clock-frequency use 2015-04-16 09:08:45 -05:00
dmaengine Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-02-18 08:49:20 -08:00
driver-model Staging drivers patches for 3.20-rc1 2015-02-15 11:30:39 -08:00
dvb [media] get_dvb_firmware: Update firmware of ITEtech IT9135 2014-09-21 17:03:04 -03:00
early-userspace
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extcon
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fault-injection
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fb doc: spelling error changes 2014-05-05 15:32:05 +02:00
filesystems ocfs2: update web page + git tree in documentation 2015-02-28 09:57:50 -08:00
firmware_class doc: fix minor typos in firmware_class README 2014-07-17 18:43:40 -07:00
fmc
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frv
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gpio gpio: board.txt: Fix the gpio name example 2015-01-28 11:14:00 -07:00
hid HID: uhid: update documentation 2014-08-25 03:28:09 -05:00
hwmon hwmon: (ina2xx) Add ina231 compatible string 2015-01-25 21:23:59 -08:00
i2c i2c: fix reference to functionality constants definition 2015-02-19 16:57:48 +01:00
i2o
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ia64 virtual: Documentation: simplify and generalize paravirt_ops.txt 2015-02-13 17:15:44 +10:30
ide
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infiniband IB/mad: add new ioctl to ABI to support new registration options 2014-08-10 20:36:00 -07:00
input Input: ALPS - move v7 packet info to Documentation and v6 packet info 2015-02-15 16:04:23 -08:00
ioctl cxl: Add documentation for userspace APIs 2014-10-08 20:16:19 +11:00
isdn
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ja_JP Documentation: Update stable address in Chinese and Japanese translations 2014-04-16 14:13:27 -07:00
kbuild Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2015-02-19 10:31:37 -08:00
kdump kernel: add panic_on_warn 2014-12-10 17:41:10 -08:00
ko_KR
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laptops Documentation: update .gitignore files 2014-09-26 11:02:59 +02:00
leds
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locking Documentation changes for 3.20 2015-02-11 13:03:11 -08:00
m68k
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memory-devices
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metag
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mic Documentation: Build mic/mpssd only for x86_64 2014-12-05 11:18:36 -05:00
mips Documentation: au1xxx-ide.c has moved 2014-08-26 09:35:53 +02:00
misc-devices Documentation/misc-devices/mei: Fix indentation of embedded code. 2015-01-29 12:56:20 -07:00
mmc
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mn10300
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mtd MTD updates for 3.16: 2014-06-11 08:35:34 -07:00
namespaces
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netlabel
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networking Documentation changes for 3.20 2015-02-11 13:03:11 -08:00
nfc
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nios2 Documentation: Add documentation for Nios2 architecture 2014-12-08 12:56:06 +08:00
parisc
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pcmcia Documentation: use subdir-y to avoid unnecessary built-in.o files 2014-09-26 11:02:55 +02:00
phy phy: Add new Exynos USB 2.0 PHY driver 2014-03-08 12:39:44 +05:30
platform Documentation: Add list of laptop models supported by the Compal driver 2014-06-10 19:11:06 -04:00
power genirq / PM: describe IRQF_COND_SUSPEND 2015-03-06 01:28:14 +01:00
powerpc cxl: Add documentation for userspace APIs 2014-10-08 20:16:19 +11:00
pps
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prctl Documentation: Restrict TSC test code to x86 2014-10-28 08:46:27 -04:00
pti
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ptp ptp: restore the makefile for building the test program. 2014-10-24 16:07:10 -04:00
rapidio rapidio/tsi721_dma: rework scatter-gather list handling 2014-08-08 15:57:24 -07:00
s390 s390/docs: Remove section about script debugging from Debugging390.txt 2015-01-15 11:11:14 +01:00
scheduler doc: brief user documentation for completion 2015-01-30 11:19:25 -07:00
scsi Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2014-12-12 10:08:06 -08:00
security KEYS: Make /proc/keys unconditional if CONFIG_KEYS=y 2015-01-22 22:34:32 +00:00
serial serial: Fix locking for uart driver set_termios() method 2014-11-05 18:53:54 -08:00
sh
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sound ALSA: hda - Add "eapd" model string for AD1986A codec 2014-12-10 14:00:13 +01:00
spi Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/doc 2014-10-07 21:14:57 -04:00
sysctl Merge branch 'akpm' (patches from Andrew) 2015-02-11 18:23:28 -08:00
target Documentation/target: Update fabric_ops to latest code 2015-01-06 13:46:49 -08:00
thermal Documentation: thermal: document of_cpufreq_cooling_register() 2015-01-06 14:39:17 -04:00
timers Documentation: update .gitignore files 2014-09-26 11:02:59 +02:00
tpm
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trace Char / Misc patches for 3.20-rc1 2015-02-15 10:48:44 -08:00
usb Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-02-10 18:57:15 -08:00
vDSO vdso: don't require 64-bit math in standalone test 2014-10-25 10:53:44 -04:00
video4linux MODULE_DEVICE_TABLE: fix some callsites 2015-02-13 21:21:40 -08:00
virtual OK, this has the big virtio 1.0 implementation, as specified by OASIS. 2015-02-18 09:24:01 -08:00
vm mm:add KPF_ZERO_PAGE flag for /proc/kpageflags 2015-02-11 17:06:00 -08:00
w1 w1: new w1_ds2406 driver 2014-06-19 17:45:14 -07:00
watchdog Documentation: use subdir-y to avoid unnecessary built-in.o files 2014-09-26 11:02:55 +02:00
wimax
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x86 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-21 10:41:29 -08:00
xtensa
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zh_CN Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2014-08-06 21:03:53 -07:00
00-INDEX Update of Documentation/dmaengine/00-INDEX 2014-12-29 15:28:24 -07:00
BUG-HUNTING
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Changes Documentation: GNU is frequently spelled Gnu 2014-12-29 15:33:17 -07:00
CodeOfConflict Code of Conflict 2015-02-27 11:44:24 -08:00
CodingStyle CodingStyle: enable emacs display of trailing whitespace 2015-01-28 12:05:46 -07:00
DMA-API-HOWTO.txt Documentation: correct parameter error for dma_mapping_error 2014-09-26 11:22:29 +02:00
DMA-API.txt DMA-API: Capitalize "CPU" consistently 2014-05-26 17:28:27 -06:00
DMA-ISA-LPC.txt DMA-API: Clarify physical/bus address distinction 2014-05-20 16:54:21 -06:00
DMA-attributes.txt doc: spelling error changes 2014-05-05 15:32:05 +02:00
HOWTO Documentation: remove outdated references to the linux-next wiki 2014-10-28 09:06:11 -04:00
IPMI.txt ipmi: Add SMBus interface driver (SSIF) 2014-12-11 15:04:11 -06:00
IRQ-affinity.txt
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IRQ-domain.txt irqdomain: Introduce new interfaces to support hierarchy irqdomains 2014-11-23 13:01:45 +01:00
IRQ.txt
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Intel-IOMMU.txt
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Makefile Documentation: add makefiles for more targets 2014-09-26 11:02:56 +02:00
ManagementStyle
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SAK.txt
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SM501.txt
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SecurityBugs
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SubmitChecklist
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SubmittingDrivers doc: SubmittingPatches: remove dead link, kerneltrap.org no longer works 2014-06-19 15:15:27 +02:00
SubmittingPatches Merge branch 'doc/sp-update' into docs-next 2015-01-29 13:11:58 -07:00
VGA-softcursor.txt
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applying-patches.txt Documentation: change "&" to "and" in Documentation/applying-patches.txt 2014-09-26 11:10:11 +02:00
assoc_array.txt
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atomic_ops.txt documentation: Add atomic_long_t to atomic_ops.txt 2014-11-13 10:34:54 -08:00
bad_memory.txt
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basic_profiling.txt
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bcache.txt
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binfmt_misc.txt binfmt_misc: touch up documentation a bit 2014-10-14 02:18:16 +02:00
braille-console.txt
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bt8xxgpio.txt
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btmrvl.txt
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bus-virt-phys-mapping.txt
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cachetlb.txt rmap: drop support of non-linear mappings 2015-02-10 14:30:31 -08:00
circular-buffers.txt
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clk.txt clk: Add rate constraints to clocks 2015-02-02 14:23:42 -08:00
coccinelle.txt
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cpu-hotplug.txt Doc/cpu-hotplug: Specify race-free way to register CPU hotplug callbacks 2014-03-20 13:43:40 +01:00
cpu-load.txt
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cputopology.txt
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crc32.txt
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dcdbas.txt
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debugging-modules.txt
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debugging-via-ohci1394.txt firewire: revert to 4 GB RDMA, fix protocols using Memory Space 2014-05-29 15:50:30 +02:00
dell_rbu.txt
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devices.txt Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-04-04 09:50:07 -07:00
digsig.txt
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dma-buf-sharing.txt Documentation/dma-buf-sharing.txt: update API descriptions 2014-08-28 11:57:24 +05:30
dontdiff Documentation: LLVMLinux: Update Documentation/dontdiff 2014-04-09 13:44:34 -07:00
dynamic-debug-howto.txt doc: spelling error changes 2014-05-05 15:32:05 +02:00
edac.txt Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial into next 2014-06-04 08:50:34 -07:00
efi-stub.txt doc: arm64: add description of EFI stub support 2014-04-30 19:57:05 +01:00
eisa.txt
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email-clients.txt Documentation/email-clients.txt: add info about Claws Mail 2014-12-02 11:55:29 -05:00
flexible-arrays.txt
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futex-requeue-pi.txt doc: Fix misnamed FUTEX_CMP_REQUEUE_PI op constants 2015-01-19 12:05:32 +01:00
gcov.txt
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gdb-kernel-debugging.txt scripts/gdb: add basic documentation 2015-02-17 14:34:54 -08:00
highuid.txt
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hsi.txt Documentation: HSI: Add some general description for the HSI subsystem 2014-05-04 09:49:46 +02:00
hw_random.txt
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hwspinlock.txt
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init.txt
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initrd.txt
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intel_txt.txt
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io-mapping.txt
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io_ordering.txt
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iostats.txt
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irqflags-tracing.txt asm/system.h: clean asm/system.h from docs 2014-04-07 16:36:11 -07:00
isapnp.txt
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java.txt Documentation: update java sample wrapper for java 7 2014-05-25 12:39:00 -07:00
kasan.txt kasan: enable instrumentation of global variables 2015-02-13 21:21:42 -08:00
kernel-doc-nano-HOWTO.txt
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kernel-docs.txt
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kernel-parameters.txt TTY/Serial driver patches for 3.20-rc1 2015-02-15 11:37:02 -08:00
kernel-per-CPU-kthreads.txt
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kmemcheck.txt doc: fix double words 2014-03-21 13:16:58 +01:00
kmemleak.txt Documentation: Add CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF case 2014-10-24 13:59:03 -04:00
kobject.txt kobject: grammar fix 2014-12-08 09:07:11 -05:00
kprobes.txt Documentation: add description for FTRACE probe status 2015-02-04 16:05:44 -05:00
kref.txt
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kselftest.txt kselftest: Move the docs to the Documentation dir 2014-11-24 10:49:54 -07:00
ldm.txt
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local_ops.txt percpu: update local_ops.txt to reflect this_cpu operations 2014-12-13 12:42:53 -08:00
lockup-watchdogs.txt lockup-watchdogs: Fix a typo 2014-08-26 09:35:52 +02:00
logo.gif
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logo.txt
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lzo.txt Documentation: lzo: document part of the encoding 2014-09-28 11:08:00 +02:00
magic-number.txt Documentation/serial: Delete obsolete driver documentation 2014-04-16 14:20:34 -07:00
mailbox.txt Documentation: Fix a typo in mailbox.txt 2014-11-03 11:54:50 -05:00
md.txt
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media-framework.txt
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memory-barriers.txt documentation: Fix smp typo in memory-barriers.txt 2015-01-07 08:59:32 -08:00
memory-hotplug.txt memory-hotplug: add sysfs valid_zones attribute 2014-10-09 22:25:52 -04:00
module-signing.txt Nothing major: the stricter permissions checking for sysfs broke 2014-04-06 09:38:07 -07:00
mono.txt
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nommu-mmap.txt fs: introduce f_op->mmap_capabilities for nommu mmap support 2015-01-20 14:02:58 -07:00
numastat.txt
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oops-tracing.txt livepatch: kernel: add TAINT_LIVEPATCH 2014-12-22 15:40:48 +01:00
padata.txt
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parport-lowlevel.txt
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parport.txt
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percpu-rw-semaphore.txt
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phy.txt phy: improved lookup method 2014-11-21 19:48:50 +05:30
pi-futex.txt
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pinctrl.txt pinctrl: clean up after enable refactoring 2014-09-04 10:05:07 +02:00
pnp.txt
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preempt-locking.txt
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printk-formats.txt lib/vsprintf: add %*pE[achnops] format specifier 2014-10-14 02:18:26 +02:00
pwm.txt pwm: modify PWM_LOOKUP to initialize all struct pwm_lookup members 2014-05-21 11:19:36 +02:00
ramoops.txt pstore-ram: Allow optional mapping with pgprot_noncached 2014-12-11 13:38:31 -08:00
rbtree.txt doc: spelling error changes 2014-05-05 15:32:05 +02:00
remoteproc.txt
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rfkill.txt rfkill: document rfkill module parameters 2015-01-09 23:22:12 +01:00
robust-futex-ABI.txt
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robust-futexes.txt doc: spelling error changes 2014-05-05 15:32:05 +02:00
rpmsg.txt
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rtc.txt
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serial-console.txt
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sgi-ioc4.txt
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smsc_ece1099.txt
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sparse.txt
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stable_api_nonsense.txt
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stable_kernel_rules.txt stable_kernel_rules: reorganize and update submission options 2015-01-12 05:04:12 -08:00
static-keys.txt
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svga.txt
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sysfs-rules.txt Documentation/sysfs-rules.txt: Add device attribute error code documentation 2014-09-19 14:44:51 -07:00
sysrq.txt
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this_cpu_ops.txt Docs: this_cpu_ops: remove redundant add forms 2014-09-26 11:03:00 +02:00
unaligned-memory-access.txt
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unicode.txt
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unshare.txt
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vfio.txt drivers/vfio: EEH support for VFIO PCI device 2014-08-05 15:28:48 +10:00
vgaarbiter.txt
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video-output.txt
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vme_api.txt
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volatile-considered-harmful.txt
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workqueue.txt
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xillybus.txt xillybus: Move out of staging 2014-09-23 23:44:16 -07:00
xz.txt
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zorro.txt
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