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The behavior of an SPI controller data output line (SDO or MOSI or COPI
(Controller Output Peripheral Input) for disambiguation) is usually not
specified when the controller is not clocking out data on SCLK edges.
However, there do exist SPI peripherals that require specific MOSI line
state when data is not being clocked out of the controller.
Conventional SPI controllers may set the MOSI line on SCLK edges then bring
it low when no data is going out or leave the line the state of the last
transfer bit. More elaborated controllers are capable to set the MOSI idle
state according to different configurable levels and thus are more suitable
for interfacing with demanding peripherals.
Add SPI mode bits to allow peripherals to request explicit MOSI idle state
when needed.
When supporting a particular MOSI idle configuration, the data output line
state is expected to remain at the configured level when the controller is
not clocking out data. When a device that needs a specific MOSI idle state
is identified, its driver should request the MOSI idle configuration by
setting the proper SPI mode bit.
Acked-by: Nuno Sa <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Reviewed-by: David Lechner <[email protected]>
Tested-by: David Lechner <[email protected]>
Signed-off-by: Marcelo Schmitt <[email protected]>
Link: https://patch.msgid.link/9802160b5e5baed7f83ee43ac819cb757a19be55.1720810545.git.marcelo.schmitt@analog.com
Signed-off-by: Mark Brown <[email protected]>
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The documentation had been removed, so should TOC entry.
Reported-by: Stephen Rothwell <[email protected]>
Fixes: 2d069c11e822 ("spi: pxa2xx: Remove outdated documentation")
Signed-off-by: Andy Shevchenko <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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The documentation is referring to the legacy enumeration of the SPI
host controllers and target devices. It has nothing to do with the
modern way, which is the only supported in kernel right now. Hence,
remove outdated documentation file.
Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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Core in spi_register_driver() already sets the .owner, so driver
does not need to.
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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Merge series from Andy Shevchenko <[email protected]>:
A couple of cleanups against linux/spi/pxa2xx_spi.h.
I'm sending this as v3 to land in the SPI subsystem. Meanwhile I'm
preparing an update to make linux/spi/pxa2xx_spi.h private to the
subsystem (PXA2xx driver). But the second part will be presented later
on (likely after v6.9-rc1). That said, this can be routed either via
SoC tree or SPI, up to respective maintainers.
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There are no more users of the deprecated is_dma_mapped in struct
spi_message so it can be removed.
References in documentation and comments are also removed.
A few similar checks if xfer->tx_dma or xfer->rx_dma are not NULL are
also removed since these are now guaranteed to be NULL because they
were previously set only if is_dma_mapped was true.
Signed-off-by: David Lechner <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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There is no use for whole 16-bit for the number of chip select pins.
Drop it to 8 bits.
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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The two example echo commands for binding the spidev driver were being
rendered as one line in the HTML output. This patch makes use of the
restructured text :: to format the commands as a code block instead
which preserves the line break.
Signed-off-by: David Lechner <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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Update links in the documentation and in-code comments which point to
the datasheet and schematic.
The current links don't work because National Semiconductor (which is
the manufacturer of this board and lm70) has been a part of Texas
Instruments since 2011 and hence http://www.national.com/ doesn't work
anymore.
Fixes: 78961a574037 ("spi_lm70llp parport adapter driver")
Fixes: 2b7300513b98 ("hwmon: (lm70) Code streamlining and cleanup")
Signed-off-by: Kousik Sanagavarapu <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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The change to use "target" requires an underline to be extended by
one more character to fix a documentation build warning:
Documentation/spi/spi-summary.rst:274: WARNING: Title underline too short.
Declare target Devices
^^^^^^^^^^^^^^^^^^^^^
Fixes: hash ("spi: Update the "master/slave" terminology in documentation")
Signed-off-by: Randy Dunlap <[email protected]>
Cc: Dhruva Gole <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: [email protected]
Reviewed-by: Dhruva Gole <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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Update the master/slave terminology wherever possible to adopt usage of
the controller/host/target. Some parts have been left untouched because
they were sysfs entries and will probably end up being inaccurate if
simply replaced here.
Signed-off-by: Dhruva Gole <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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In commit 8caab75fd2c2 ("spi: Generalize SPI "master" to "controller"")
some functions and struct members were renamed. Adapt the documentation
accordingly.
Acked-by: Jonathan Cameron <[email protected]>
Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/3d643e22cacff12d3918ad5224baa1d01813d03b.1707324794.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <[email protected]>
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Update DMA mapping and using logic in the documentation to follow what
the code does.
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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Replace master/slave by host/peripheral language in the documentation.
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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Fix typos in Documentation.
Signed-off-by: Bjorn Helgaas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>
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With commit 721da5cee9d4 ("driver core: remove CONFIG_SYSFS_DEPRECATED and
CONFIG_SYSFS_DEPRECATED_V2"), ./scripts/checkkconfigsymbols.py indicated
an unresolved reference to the config SYSFS_DEPRECATED in the SPI summary
documentation.
Simply, delete the sentence referring to the removed config there. Also
update the documentation, as these sys/class entries should always be
symlinks, as the commit message of the commit above suggests.
Signed-off-by: Lukas Bulwahn <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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Correct spelling problems for Documentation/spi/ as reported
by codespell.
Signed-off-by: Randy Dunlap <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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This converts the PXA2xx SPI driver to use GPIO descriptors
exclusively to retrieve GPIO chip select lines.
The device tree and ACPI paths of the driver already use
descriptors, hence ->use_gpio_descriptors is already set and
this codepath is well tested.
Convert all the PXA boards providing chip select GPIOs as
platform data and drop the old GPIO chipselect handling in
favor of the core managing it exclusively.
Cc: Marek Vasut <[email protected]>
Cc: Daniel Mack <[email protected]>
Cc: Haojian Zhuang <[email protected]>
Cc: Robert Jarzmik <[email protected]>
Cc: [email protected]
Acked-by: Jonathan Cameron <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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There is no user of the enable_loopback member in the struct pxa2xx_spi_chip.
Remote this legacy member completely.
The mentioned in the documentation the testing phase can be performed with
spidev_test tool.
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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Since the last user of the custom ->cs_control() gone, we may get rid of
this legacy API completely.
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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This doc is fairly outdated and only uses legacy device instantiation
terminology. Let us update it and also mention the OF and ACPI device
tables, to make easier for users to figure out how should be defined.
Also, mention that devices bind could be done in user-space now using
the "driver_override" sysfs entry.
Suggested-by: Ralph Siemsen <[email protected]>
Signed-off-by: Javier Martinez Canillas <[email protected]>
Acked-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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The last user is gone since commit
2962db71c703 ("staging/fbtft: Remove fbtft_device")
in 2019.
Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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Update documentation by pointing out that it's applicable mostly
for a legacy platform. While at it, add couple of points with regard
to ACPI, Device Tree, and automatic DMA enablement.
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi updates from Mark Brown:
"The only core work for SPI this time around is the completion of the
conversion to the new style method for specifying transfer delays,
meaning we can cope with what most controllers support more directly
using conversions in the core rather than open coding in drivers.
Otherwise it's a good stack of cleanups and fixes plus a few new
drivers.
Summary:
- Completion of the conversion to new style transfer delay
configuration
- Introduction and use of module_parport_driver() helper, merged here
as there's no parport tree
- Support for Altera SoCs on DFL buses, NXP i.MX8DL, HiSilicon
Kunpeng, MediaTek MT8195"
* tag 'spi-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (113 commits)
spi: Rename enable1 to activate in spi_set_cs()
spi: Convert Freescale QSPI binding to json schema
spi: stm32-qspi: fix debug format string
spi: tools: make a symbolic link to the header file spi.h
spi: fsi: add a missing of_node_put
spi: Make error handling of gpiod_count() call cleaner
spidev: Add Micron SPI NOR Authenta device compatible
spi: brcm,spi-bcm-qspi: convert to the json-schema
spi: altera: Add DFL bus driver for Altera API Controller
spi: altera: separate core code from platform code
spi: stm32-qspi: Fix compilation warning in ARM64
spi: Handle SPI device setup callback failure.
spi: sync up initial chipselect state
spi: stm32-qspi: Add dirmap support
spi: stm32-qspi: Trigger DMA only if more than 4 bytes to transfer
spi: stm32-qspi: fix pm_runtime usage_count counter
spi: spi-zynqmp-gqspi: return -ENOMEM if dma_map_single fails
spi: spi-zynqmp-gqspi: fix use-after-free in zynqmp_qspi_exec_op
spi: spi-zynqmp-gqspi: Resolved slab-out-of-bounds bug
spi: spi-zynqmp-gqspi: fix hang issue when suspend/resume
...
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Signed-off-by: Stéphane Blondon <[email protected]>
Link: https://lore.kernel.org/r/CAOy+up7EdTf4ouh5onVy_ZzXFWGBEP+P6CPqY-=E+1UFwCeq8w@mail.gmail.com
Signed-off-by: Jonathan Corbet <[email protected]>
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The 'delay_usecs' field is no longer present on the spi_transfer struct.
This change updates the doc to mention the usage of the (relatively) new
'delay' field.
Signed-off-by: Alexandru Ardelean <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.
Deterministic algorithm:
For each file:
If not .svg:
For each line:
If doesn't contain `\bxmlns\b`:
For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
If both the HTTP and HTTPS versions
return 200 OK and serve the same content:
Replace HTTP with HTTPS.
Signed-off-by: Alexander A. Klimov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
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While there's one file there with briefily describes the uAPI,
the documentation was written just like most subsystems: focused
on kernel developers. So, add it together with driver-api books.
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Acked-by: Jonathan Cameron <[email protected]> # for iio
Signed-off-by: Jonathan Corbet <[email protected]>
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Convert each file at I2C subsystem, renaming them to .rst and
adding to the driver-api book.
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
Acked-by: Alexandre Belloni <[email protected]>
Acked-by: Jonathan Cameron <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
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This patch documents set_cs_timing SPI master method.
Signed-off-by: Sowjanya Komatineni <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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It's also a slave controller driver now, calling it "master" is slightly
misleading.
Signed-off-by: Lubomir Rintel <[email protected]>
Acked-by: Robert Jarzmik <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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This is a respin with a wider audience (all that get_maintainer returned)
and I know this spams a *lot* of people. Not sure what would be the correct
way, so my apologies for ruining your inbox.
The 00-INDEX files are supposed to give a summary of all files present
in a directory, but these files are horribly out of date and their
usefulness is brought into question. Often a simple "ls" would reveal
the same information as the filenames are generally quite descriptive as
a short introduction to what the file covers (it should not surprise
anyone what Documentation/sched/sched-design-CFS.txt covers)
A few years back it was mentioned that these files were no longer really
needed, and they have since then grown further out of date, so perhaps
it is time to just throw them out.
A short status yields the following _outdated_ 00-INDEX files, first
counter is files listed in 00-INDEX but missing in the directory, last
is files present but not listed in 00-INDEX.
List of outdated 00-INDEX:
Documentation: (4/10)
Documentation/sysctl: (0/1)
Documentation/timers: (1/0)
Documentation/blockdev: (3/1)
Documentation/w1/slaves: (0/1)
Documentation/locking: (0/1)
Documentation/devicetree: (0/5)
Documentation/power: (1/1)
Documentation/powerpc: (0/5)
Documentation/arm: (1/0)
Documentation/x86: (0/9)
Documentation/x86/x86_64: (1/1)
Documentation/scsi: (4/4)
Documentation/filesystems: (2/9)
Documentation/filesystems/nfs: (0/2)
Documentation/cgroup-v1: (0/2)
Documentation/kbuild: (0/4)
Documentation/spi: (1/0)
Documentation/virtual/kvm: (1/0)
Documentation/scheduler: (0/2)
Documentation/fb: (0/1)
Documentation/block: (0/1)
Documentation/networking: (6/37)
Documentation/vm: (1/3)
Then there are 364 subdirectories in Documentation/ with several files that
are missing 00-INDEX alltogether (and another 120 with a single file and no
00-INDEX).
I don't really have an opinion to whether or not we /should/ have 00-INDEX,
but the above 00-INDEX should either be removed or be kept up to date. If
we should keep the files, I can try to keep them updated, but I rather not
if we just want to delete them anyway.
As a starting point, remove all index-files and references to 00-INDEX and
see where the discussion is going.
Signed-off-by: Henrik Austad <[email protected]>
Acked-by: "Paul E. McKenney" <[email protected]>
Just-do-it-by: Steven Rostedt <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
Acked-by: Paul Moore <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: Mark Brown <[email protected]>
Acked-by: Mike Rapoport <[email protected]>
Cc: [Almost everybody else]
Signed-off-by: Jonathan Corbet <[email protected]>
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Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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This driver requires a GPIO line to be used for the chip select of
each SPI device.
Remove the ep93xx_spi_chip_ops definition from the platform data
and use the spi core GPIO handling for the chip selects.
Fix all the ep93xx platforms that use this driver and remove the
old Documentation.
Signed-off-by: H Hartley Sweeten <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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Update 00-INDEX files with the current file list to reflect the runnable
code move.
Acked-by: Michal Marek <[email protected]>
Acked-by: Jonathan Corbet <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>
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Now that spidev_test and spidev_fdx have been moved, remove them
from the Documentation index and move their .gitignore file.
Signed-off-by: Joshua Clayton <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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Jon Corbet requested this code moved with the last changeset,
https://lkml.org/lkml/2015/3/1/144,
but the patch was not applied because it missed the Makefile.
Moved spidev_test, spidev_fdx and their Makefile infrastructure.
Signed-off-by: Joshua Clayton <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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Use for struct pxa2xx_spi_master clock_enable field was removed years ago
from the pxa2xx-spi driver by the commit 2f1a74e5a2de ("[ARM] pxa: make
pxa2xx_spi driver use ssp_request()/ssp_free()").
Therefore remove it from structure definition, documentation and from
couple affected board files.
Signed-off-by: Jarkko Nikula <[email protected]>
Acked-by: Mark Brown <[email protected]>
Signed-off-by: Robert Jarzmik <[email protected]>
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Documentation/spi/spidev_test.c:83:5: warning: no previous prototype for 'unespcape' [-Wmissing-prototypes]
fix spelling too.
Acked-by: Mark Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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'spi/topic/spidev-test' into spi-next
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Signed-off-by: Adrian Remonda <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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Signed-off-by: Adrian Remonda <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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Signed-off-by: Adrian Remonda <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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New drivers should use PM ops instead of the legacy suspend/resume
callbacks. Update the SPI device driver guide to reflect this.
Signed-off-by: Lars-Peter Clausen <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/jikos/doc
Pull documentation updates from Jiri Kosina:
"Updates to kernel documentation.
I took this over (hopefully temporarily) from Randy who was not
willing to maintain it any longer. This pile mostly is a relay of
queue that Randy already had in his tree"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/doc:
Documentation: fix broken v4l-utils URL
Documentation: update include path for mpssd
Documentation: correct parameter error for dma_mapping_error
MAINTAINERS: update location of linux-doc tree
Documentation: remove networking/.gitignore
tools: add more endian.h macros
Make Documenation depend on headers_install
Docs: this_cpu_ops: remove redundant add forms
Documentation: disable vdso_test to avoid breakage with old glibc
Documentation: update vDSO makefile to build portable examples
Documentation: update .gitignore files
Documentation: support glibc versions without htole macros
v4l2-pci-skeleton: Only build if PCI is available
Documentation: fix misc. warnings
Documentation: make functions static to avoid prototype warnings
Documentation: add makefiles for more targets
Documentation: use subdir-y to avoid unnecessary built-in.o files
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Change the Documentation makefiles from obj-m to subdir-y
to avoid generating unnecessary built-in.o files since nothing
in Documentation/ is ever linked in to vmlinux.
Signed-off-by: Peter Foley <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
Signed-off-by: Randy Dunlap <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
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Contributors are not listed in alphabetical order as claimed by documentation.
Signed-off-by: Oscar Utbult <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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'spi/topic/sh-hspi', 'spi/topic/sh-msiof', 'spi/topic/sh-sci', 'spi/topic/sirf' and 'spi/topic/spidev' into spi-next
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Use SPI_IOC_RD_MODE32 to print the full SPI mode, now in hex.
Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
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