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Lukas Wunner eec1d566cd gpio: Introduce ->get_multiple callback 
SPI-attached GPIO controllers typically read out all inputs in one go.
If callers desire the values of multipe inputs, ideally a single readout
should take place to return the desired values.  However the current
driver API only offers a ->get callback but no ->get_multiple (unlike
->set_multiple, which is present).  Thus, to read multiple inputs, a
full readout needs to be performed for every single value (barring
driver-internal caching), which is inefficient.

In fact, the lack of a ->get_multiple callback has been bemoaned
repeatedly by the gpio subsystem maintainer:
http://www.spinics.net/lists/linux-gpio/msg10571.html
http://www.spinics.net/lists/devicetree/msg121734.html

Introduce the missing callback.  Add corresponding consumer functions
such as gpiod_get_array_value().  Amend linehandle_ioctl() to take
advantage of the newly added infrastructure.  Update the documentation.

Cc: Rojhalat Ibrahim <imr@rtschenk.de>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-10-19 22:32:39 +02:00
..
ABI
for-f2fs-4.14
2017-09-12 20:05:58 -07:00
accounting
…
acpi
This is the bulk of GPIO changes for the v4.13 series:
2017-07-07 12:40:27 -07:00
admin-guide
selinux/stable-4.14 PR 20170831
2017-09-12 13:21:00 -07:00
aoe
…
arm
Documentation: arm: Replace use of virt_to_phys with __pa_symbol
2017-07-17 13:43:58 -06:00
arm64
arm64: Expose DC CVAP to userspace
2017-08-09 11:00:35 +01:00
auxdisplay
…
backlight
…
blackfin
…
block
doc, block, bfq: better describe how to properly configure bfq
2017-08-31 13:55:26 -06:00
blockdev
SCSI misc on 20170907
2017-09-07 21:11:05 -07:00
bus-devices
…
cdrom
cdrom: Make device operations read-only
2017-02-14 08:29:56 -07:00
cgroup-v1
mm, vmpressure: pass-through notification support
2017-07-10 16:32:31 -07:00
cma
…
connector
…
console
…
core-api
Merge branch 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
2017-09-06 21:59:31 -07:00
cpu-freq
cpufreq: intel_pstate: Document the current behavior and user interface
2017-05-14 02:06:03 +02:00
cpuidle
…
cris
…
crypto
KEYS: Add documentation for asymmetric keyring restrictions
2017-07-14 11:01:38 +10:00
dev-tools
docs: disable KASLR when debugging kernel
2017-07-17 14:49:01 -06:00
device-mapper
dm raid: bump target version
2017-07-25 14:54:20 -04:00
devicetree
gpio: gpio-dwapb: add optional reset
2017-10-19 22:32:38 +02:00
dmaengine
Merge branch 'topic/dmatest' into for-linus
2017-09-06 21:55:10 +05:30
doc-guide
sphinx.rst: Allow Sphinx version 1.6 at the docs
2017-08-26 15:50:27 -06:00
driver-api
Revert "firmware: add sanity check on shutdown/suspend"
2017-09-10 21:19:06 -07:00
driver-model
genirq/irq_sim: Add a devres variant of irq_sim_init()
2017-08-16 16:40:02 +02:00
early-userspace
Documentation: Fix dead URLs to ftp.kernel.org
2017-03-29 15:46:06 -06:00
EDID
drm: use .hword to represent 16-bit numbers
2017-03-30 10:15:19 +02:00
extcon
extcon: Remove porting compatibility of swich class
2017-04-06 10:55:24 +09:00
fault-injection
fault-inject: add /proc/<pid>/fail-nth
2017-07-14 15:05:13 -07:00
fb
fbcon: remove restriction on margin color
2017-09-04 16:00:49 +02:00
features
docs/features: parisc implements tracehook
2017-08-07 14:18:40 -06:00
filesystems
Some cleanups and a big bug fix for ACLs. When I was reviewing Jan Kara's
2017-09-15 12:16:18 -07:00
firmware_class
firmware: revamp firmware documentation
2017-01-11 09:42:59 +01:00
fmc
…
fpga
fpga: Add scatterlist based programming
2017-02-10 15:20:44 +01:00
frv
…
gpio
gpio: Introduce ->get_multiple callback
2017-10-19 22:32:39 +02:00
gpu
Merge tag 'drm-intel-next-2017-08-18' of git://anongit.freedesktop.org/git/drm-intel into drm-next
2017-08-22 10:03:07 +10:00
hid
Documentation: hid: fix path to input bus definitions
2017-03-13 17:15:19 -06:00
hwmon
hwmon: (pmbus/lm25066) Add support for TI LM5066I
2017-08-30 06:31:13 -07:00
i2c
i2c: Documentation: i2c-topology: mention recent driver additions
2017-08-22 08:36:57 +02:00
ia64
…
ide
…
iio
iio: adc: New driver for Cirrus Logic EP93xx ADC
2017-07-25 19:56:23 +01:00
infiniband
Documentation: Hardware tag matching
2017-08-29 08:30:21 -04:00
input
Documentation:input: fix typo
2017-08-30 15:18:24 -06:00
ioctl
scsi: cxlflash: Introduce host ioctl support
2017-06-26 15:01:11 -04:00
isdn
…
kbuild
kbuild: Update example for ccflags-y usage
2017-08-07 14:24:28 -06:00
kdump
kexec/kdump: minor Documentation updates for arm64 and Image
2017-07-12 16:26:00 -07:00
kernel-hacking
There has been a fair amount of activity in the docs tree this time
2017-07-03 21:13:25 -07:00
laptops
platform/x86: thinkpad_acpi: Fix warning about deprecated hwmon_device_register
2017-08-18 15:57:24 -07:00
leds
Documentaion: leds: leds-lp55xx.txt: Fix typos
2017-03-17 13:06:14 -06:00
lightnvm
lightnvm: physical block device (pblk) target
2017-04-16 10:06:33 -06:00
livepatch
livepatch: allow removal of a disabled patch
2017-03-08 09:38:43 +01:00
locking
Merge branch 'linus' into locking/core, to fix up conflicts
2017-09-04 11:01:18 +02:00
m68k
…
md
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
2017-05-03 10:05:38 -07:00
media
media: add qcom_camss.rst to v4l-drivers rst file
2017-09-05 07:28:25 -04:00
memory-devices
…
metag
…
mic
…
mips
…
misc-devices
Documentation: misc-devices: Add Documentation for pci-endpoint-test driver
2017-04-28 10:23:19 -05:00
mmc
MMC core:
2017-05-02 17:34:32 -07:00
mn10300
…
mtd
spi-nor: Add support for Intel SPI serial flash controller
2017-01-03 17:33:36 +00:00
namespaces
…
netlabel
…
networking
Documentation: link in networking docs
2017-09-16 09:12:48 -07:00
nfc
…
nios2
…
nvdimm
…
nvmem
NVMEM documentation fix: A minor typo
2017-08-24 13:31:58 -06:00
parisc
…
PCI
docs: update old references for DocBook from the documentation
2017-05-16 08:44:19 -03:00
pcmcia
…
perf
perf: qcom: Add L3 cache PMU driver
2017-04-03 18:53:50 +01:00
phy
…
platform
…
power
Merge branch 'pm-sleep'
2017-09-04 00:06:02 +02:00
powerpc
powerpc updates for 4.13
2017-07-07 13:55:45 -07:00
pps
drivers/pps: aesthetic tweaks to PPS-related content
2017-09-08 18:26:51 -07:00
process
docs: process: drop git snapshots from applying-patches.rst
2017-08-30 15:25:30 -06:00
pti
…
ptp
…
rapidio
…
RCU
doc: Set down RCU's scheduling-clock-interrupt needs
2017-08-17 07:31:14 -07:00
s390
docs: add documentation for vfio-ccw
2017-03-31 12:55:11 +02:00
scheduler
sched/deadline: Add documentation about GRUB reclaiming
2017-06-08 10:31:56 +02:00
scsi
scsi: make asynchronous aborts mandatory
2017-04-06 13:07:33 -04:00
security
docs: ReSTify table of contents in core.rst
2017-08-30 15:27:58 -06:00
serial
tty: n_gsm: do not send/receive in ldisc close path
2017-06-03 18:48:52 +09:00
sh
docs-rst: convert sh book to ReST
2017-05-16 08:44:18 -03:00
sound
sound updates for 4.13-rc1
2017-07-06 10:56:51 -07:00
sparc
Documentation/sparc: Steps for sending break on sunhv console
2017-02-23 08:27:25 -08:00
sphinx
Documentation/sphinx: fix kernel-doc decode for non-utf-8 locale
2017-08-31 13:36:28 -06:00
sphinx-static
docs RTD theme: code-block with line nos - lines and line numbers don't line up.
2017-07-17 13:48:45 -06:00
spi
spi: Document SPI slave controller support
2017-05-26 13:11:00 +01:00
sysctl
Merge branch 'akpm' (patches from Andrew)
2017-09-06 20:49:49 -07:00
target
Documentation/target: add an example script to configure an iSCSI target
2017-05-01 22:21:35 -07:00
thermal
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
2017-05-12 11:58:45 -07:00
timers
rcu: Eliminate NOCBs CPU-state Kconfig options
2017-06-08 18:52:43 -07:00
trace
stm class: Document the stm_ftrace
2017-08-25 17:58:34 +03:00
translations
kokr/memory-barriers.txt: Apply atomic_t.txt change
2017-09-08 10:10:53 -06:00
usb
usb: gadget: add f_uac1 variant based on a new u_audio api
2017-06-19 09:22:47 +03:00
userspace-api
doc: ReSTify no_new_privs.txt
2017-05-18 10:30:09 -06:00
virtual
KVM/ARM Changes for v4.14
2017-09-07 18:22:04 +02:00
vm
hmm: heterogeneous memory management documentation
2017-09-08 18:26:45 -07:00
w1
w1: add documentation for w1_ds2438
2017-03-17 15:10:49 +09:00
watchdog
watchdog: Revert "iTCO_wdt: all versions count down twice"
2017-09-09 17:41:24 +02:00
wimax
…
x86
Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-09-04 13:56:37 -07:00
xtensa
of: update ePAPR references to point to Devicetree Specification
2017-06-22 11:22:06 -05:00
.gitignore
…
00-INDEX
linux-kselftest-4.13-rc1-update
2017-07-07 14:04:47 -07:00
atomic_bitops.txt
Documentation/locking/atomic: Add documents for new atomic_t APIs
2017-08-10 12:29:00 +02:00
atomic_t.txt
Documentation/locking/atomic: Finish the document...
2017-08-25 11:06:33 +02:00
bcache.txt
bcache.txt: standardize document format
2017-07-14 13:51:27 -06:00
bt8xxgpio.txt
bt8xxgpio.txt: standardize document format
2017-07-14 13:51:27 -06:00
btmrvl.txt
btmrvl.txt: standardize document format
2017-07-14 13:51:27 -06:00
bus-virt-phys-mapping.txt
bus-virt-phys-mapping.txt: standardize document format
2017-07-14 13:51:28 -06:00
cachetlb.txt
cachetlb.txt: standardize document format
2017-07-14 13:51:28 -06:00
cgroup-v2.txt
cgroup: add cgroup.stat interface with basic hierarchy stats
2017-08-02 12:05:20 -07:00
Changes
docs: add back 'Documentation/Changes' file (as symlink)
2016-12-14 16:30:12 -08:00
circular-buffers.txt
circular-buffers.txt: standardize document format
2017-07-14 13:51:29 -06:00
clk.txt
clk.txt: standardize document format
2017-07-14 13:51:29 -06:00
CodingStyle
…
conf.py
docs-rst: don't require adjustbox anymore
2017-09-08 10:02:55 -06:00
cpu-load.txt
cpu-load: standardize document format
2017-07-14 13:51:30 -06:00
cputopology.txt
cputopology.txt: standardize document format
2017-07-14 13:51:30 -06:00
crc32.txt
crc32.txt: standardize document format
2017-07-14 13:51:30 -06:00
dcdbas.txt
dcdbas.txt: standardize document format
2017-07-14 13:51:31 -06:00
debugging-modules.txt
…
debugging-via-ohci1394.txt
debugging-via-ohci1394.txt: standardize document format
2017-07-14 13:51:34 -06:00
dell_rbu.txt
dell_rbu.txt: standardize document format
2017-07-14 13:58:12 -06:00
digsig.txt
digsig.txt: standardize document format
2017-07-14 13:51:31 -06:00
DMA-API-HOWTO.txt
DMA-API-HOWTO.txt: standardize document format
2017-07-14 13:51:32 -06:00
DMA-API.txt
dma-coherent: remove the DMA_MEMORY_MAP and DMA_MEMORY_IO flags
2017-09-01 11:59:17 +02:00
DMA-attributes.txt
DMA-attributes.txt: standardize document format
2017-07-14 13:51:33 -06:00
DMA-ISA-LPC.txt
DMA-ISA-LPC.txt: standardize document format
2017-07-14 13:51:33 -06:00
docutils.conf
…
dontdiff
Remove gperf usage from toolchain
2017-08-19 11:02:53 -07:00
efi-stub.txt
efi-stub.txt: standardize document format
2017-07-14 13:51:34 -06:00
eisa.txt
eisa.txt: standardize document format
2017-07-14 13:51:34 -06:00
errseq.rst
Documentation: add some docs for errseq_t
2017-07-29 09:01:02 -04:00
flexible-arrays.txt
flexible-arrays.txt: standardize document format
2017-07-14 13:51:35 -06:00
futex-requeue-pi.txt
futex-requeue-pi.txt: standardize document format
2017-07-14 13:51:35 -06:00
gcc-plugins.txt
gcc-plugins.txt: standardize document format
2017-07-14 13:51:36 -06:00
highuid.txt
highuid.txt: standardize document format
2017-07-14 13:51:36 -06:00
hw_random.txt
hw_random.txt: standardize document format
2017-07-14 13:51:37 -06:00
hwspinlock.txt
hwspinlock.txt: standardize document format
2017-07-14 13:51:37 -06:00
index.rst
Make the main documentation title less Geocities
2017-06-23 14:02:27 -06:00
intel_txt.txt
intel_txt.txt: standardize document format
2017-07-14 13:51:38 -06:00
Intel-IOMMU.txt
Intel-IOMMU.txt: standardize document format
2017-07-14 13:51:38 -06:00
io_ordering.txt
io_ordering.txt: standardize document format
2017-07-14 13:51:39 -06:00
io-mapping.txt
io-mapping.txt: standardize document format
2017-07-14 13:51:38 -06:00
iostats.txt
iostats.txt: update it to cover recent Kernels
2017-07-14 13:51:40 -06:00
IPMI.txt
IPMI.txt: standardize document format
2017-07-14 13:51:40 -06:00
IRQ-affinity.txt
IRQ-affinity.txt: standardize document format
2017-07-14 13:51:41 -06:00
IRQ-domain.txt
IRQ-domain.txt: standardize document format
2017-07-14 13:51:41 -06:00
IRQ.txt
IRQ.txt: add a markup for its title
2017-07-14 13:51:42 -06:00
irqflags-tracing.txt
irqflags-tracing.txt: standardize document format
2017-07-14 13:51:42 -06:00
isa.txt
isa.txt: standardize document format
2017-07-14 13:51:43 -06:00
isapnp.txt
isapnp.txt: promote title level
2017-07-14 13:51:43 -06:00
kernel-doc-nano-HOWTO.txt
docs: update old references for DocBook from the documentation
2017-05-16 08:44:19 -03:00
kernel-per-CPU-kthreads.txt
kernel-per-CPU-kthreads.txt: standardize document format
2017-07-14 13:51:43 -06:00
kobject.txt
kobject.txt: standardize document format
2017-07-14 13:51:44 -06:00
kprobes.txt
docs: kprobes.txt: Fix whitespacing
2017-07-14 13:58:14 -06:00
kref.txt
kref.txt: standardize document format
2017-07-14 13:51:45 -06:00
ldm.txt
ldm.txt: standardize document format
2017-07-14 13:51:45 -06:00
lockup-watchdogs.txt
lockup-watchdogs.txt: standardize document format
2017-07-14 13:51:46 -06:00
logo.gif
…
logo.txt
…
lsm.txt
docs-rst: convert lsm from DocBook to ReST
2017-05-16 08:44:19 -03:00
lzo.txt
lzo.txt: standardize document format
2017-07-14 13:51:46 -06:00
mailbox.txt
mailbox.txt: standardize document format
2017-07-14 13:51:47 -06:00
Makefile
doc: Makefile: if sphinx is not found, run a check script
2017-08-24 13:18:30 -06:00
memory-barriers.txt
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-09-04 11:52:29 -07:00
memory-hotplug.txt
memory-hotplug.txt: standardize document format
2017-07-14 13:57:53 -06:00
men-chameleon-bus.txt
men-chameleon-bus.txt: standardize document format
2017-07-14 13:57:54 -06:00
nommu-mmap.txt
nommu-mmap.txt: don't use all upper case on titles
2017-07-14 13:57:55 -06:00
ntb.txt
This series converts a number of top-level documents to the RST format
2017-07-15 12:58:58 -07:00
numastat.txt
numastat.txt: standardize document format
2017-07-14 13:57:56 -06:00
padata.txt
padata.txt: standardize document format
2017-07-14 13:57:56 -06:00
parport-lowlevel.txt
parport-lowlevel.txt: standardize document format
2017-07-14 13:57:57 -06:00
percpu-rw-semaphore.txt
percpu-rw-semaphore.txt: standardize document format
2017-07-14 13:57:58 -06:00
phy.txt
phy.txt: standardize document format
2017-07-14 13:57:58 -06:00
pi-futex.txt
pi-futex.txt: standardize document format
2017-07-14 13:57:59 -06:00
pnp.txt
pnp.txt: standardize document format
2017-07-14 13:57:59 -06:00
preempt-locking.txt
preempt-locking.txt: standardize document format
2017-07-14 13:58:00 -06:00
printk-formats.txt
printk-formats.txt: Add examples for %pF and %pS usage
2017-08-24 18:49:52 +02:00
pwm.txt
pwm: Standardize document format
2017-07-06 08:23:30 +02:00
rbtree.txt
rbtree: cache leftmost node internally
2017-09-08 18:26:48 -07:00
remoteproc.txt
remoteproc.txt: standardize document format
2017-07-14 13:58:02 -06:00
rfkill.txt
rfkill.txt: standardize document format
2017-07-14 13:58:02 -06:00
robust-futex-ABI.txt
robust-futex-ABI.txt: standardize document format
2017-07-14 13:58:03 -06:00
robust-futexes.txt
robust-futexes.txt: standardize document format
2017-07-14 13:58:03 -06:00
rpmsg.txt
rpmsg.txt: standardize document format
2017-07-14 13:58:04 -06:00
rtc.txt
rtc: add generic nvmem support
2017-07-07 13:14:14 +02:00
SAK.txt
SAK.txt: standardize document format
2017-07-14 13:58:04 -06:00
sgi-ioc4.txt
sgi-ioc4.txt: standardize document format
2017-07-14 13:58:05 -06:00
siphash.txt
siphash.txt: standardize document format
2017-07-14 13:58:06 -06:00
SM501.txt
SM501.txt: standardize document format
2017-07-14 13:58:06 -06:00
smsc_ece1099.txt
smsc_ece1099.txt: standardize document format
2017-07-14 13:58:07 -06:00
static-keys.txt
jump_label: Provide hotplug context variants
2017-08-10 12:28:59 +02:00
SubmittingPatches
…
svga.txt
svga.txt: standardize document format
2017-07-14 13:58:08 -06:00
switchtec.txt
switchtec: Add IOCTLs to the Switchtec driver
2017-04-12 12:23:37 -05:00
sync_file.txt
sync_file.txt: standardize document format
2017-05-24 13:01:27 -03:00
tee.txt
tee.txt: standardize document format
2017-07-14 13:58:14 -06:00
this_cpu_ops.txt
this_cpu_ops.txt: standardize document format
2017-07-14 13:58:08 -06:00
unaligned-memory-access.txt
unaligned-memory-access.txt: standardize document format
2017-07-14 13:58:09 -06:00
vfio-mediated-device.txt
vfio-mediated-device.txt: standardize document format
2017-07-14 13:58:10 -06:00
vfio.txt
vfio.txt: standardize document format
2017-07-14 13:58:10 -06:00
video-output.txt
…
xillybus.txt
xillybus.txt: standardize document format
2017-07-14 13:58:11 -06:00
xz.txt
xz.txt: standardize document format
2017-07-14 13:58:11 -06:00
zorro.txt
zorro.txt: standardize document format
2017-07-14 13:58:12 -06:00