linux-stable/Documentation/driver-api
Linus Torvalds 828907ef25 This is the bulk of GPIO development for the v5.7 kernel cycle.
Core and userspace API:
 
 - The userspace API KFIFOs have been imoproved with locks that
   do not block interrupts. This makes us better at getting
   events to userspace without blocking or disturbing new events
   arriving in the same time. This was reviewed by the KFIFO
   maintainer Stefani. This is a generic improvement which
   paves the road for similar improvements in other subsystems.
 
 - We provide a new ioctl() for monitoring changes in the line
   information, such as when multiple clients are taking lines
   and giving them back, possibly reconfiguring them in the
   process: we can now monitor that and not get stuck with stale
   static information.
 
 - An example tool 'gpio-watch' is provided to showcase this
   functionality.
 
 - Timestamps for events are switched to ktime_get_ns() which is
   monotonic. We previously had a 'realtime' stamp which could
   move forward and *backward* in time, which probably would just
   cause silent bugs and weird behaviour. In the long run we
   see two relevant timestamps: ktime_get_ns() or the timestamp
   sometimes provided by the GPIO hardware itself, if that
   exists.
 
 - Device Tree overlay support for GPIO hogs. On systems that
   load overlays, these overlays can now contain hogs, and will
   then be respected.
 
 - Handle pin control interaction with nonexisting pin ranges
   in the GPIO library core instead of in the individual
   drivers.
 
 New drivers:
 
 - New driver for the Mellanox BlueField 2 GPIO controller.
 
 Driver improvements:
 
 - Introduce the BGPIOF_NO_SET_ON_INPUT flag to the generic
   MMIO GPIO library and use this flag in the MT7621 driver.
 
 - Texas Instruments OMAP CPU power management improvements,
   such as blocking of idle on pending GPIO interrupts.
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Merge tag 'gpio-v5.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "This is the bulk of GPIO development for the v5.7 kernel cycle.

  Core and userspace API:

   - The userspace API KFIFOs have been imoproved with locks that do not
     block interrupts. This makes us better at getting events to
     userspace without blocking or disturbing new events arriving in the
     same time. This was reviewed by the KFIFO maintainer Stefani. This
     is a generic improvement which paves the road for similar
     improvements in other subsystems.

   - We provide a new ioctl() for monitoring changes in the line
     information, such as when multiple clients are taking lines and
     giving them back, possibly reconfiguring them in the process: we
     can now monitor that and not get stuck with stale static
     information.

   - An example tool 'gpio-watch' is provided to showcase this
     functionality.

   - Timestamps for events are switched to ktime_get_ns() which is
     monotonic. We previously had a 'realtime' stamp which could move
     forward and *backward* in time, which probably would just cause
     silent bugs and weird behaviour. In the long run we see two
     relevant timestamps: ktime_get_ns() or the timestamp sometimes
     provided by the GPIO hardware itself, if that exists.

   - Device Tree overlay support for GPIO hogs. On systems that load
     overlays, these overlays can now contain hogs, and will then be
     respected.

   - Handle pin control interaction with nonexisting pin ranges in the
     GPIO library core instead of in the individual drivers.

  New drivers:

   - New driver for the Mellanox BlueField 2 GPIO controller.

  Driver improvements:

   - Introduce the BGPIOF_NO_SET_ON_INPUT flag to the generic MMIO GPIO
     library and use this flag in the MT7621 driver.

   - Texas Instruments OMAP CPU power management improvements, such as
     blocking of idle on pending GPIO interrupts"

* tag 'gpio-v5.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (59 commits)
  Revert "gpio: eic-sprd: Use devm_platform_ioremap_resource()"
  pinctrl: Unconditionally assign .request()/.free()
  gpio: Unconditionally assign .request()/.free()
  gpio: export of_pinctrl_get to modules
  pinctrl: Define of_pinctrl_get() dummy for !PINCTRL
  gpio: Rename variable in core APIs
  gpio: Avoid using pin ranges with !PINCTRL
  gpiolib: Remove unused gpio_chip parameter from gpio_set_bias()
  gpiolib: Pass gpio_desc to gpio_set_config()
  gpiolib: Introduce gpiod_set_config()
  tools: gpio: Fix out-of-tree build regression
  gpio: gpiolib: fix a doc warning
  gpio: tegra186: Add Tegra194 pin ranges for GG.0 and GG.1
  gpio: tegra186: Add support for pin ranges
  gpio: Support GPIO controllers without pin-ranges
  ARM: integrator: impd1: Use GPIO_LOOKUP() helper macro
  gpio: brcmstb: support gpio-line-names property
  tools: gpio: Fix typo in gpio-utils
  tools: gpio-hammer: Apply scripts/Lindent and retain good changes
  gpiolib: gpio_name_to_desc: factor out !name check
  ...
2020-04-04 10:27:00 -07:00
..
80211 docs: prevent warnings due to autosectionlabel 2020-03-20 17:01:29 -06:00
acpi
backlight docs: lp855x-driver.rst: add it to the driver-api book 2019-07-15 11:03:02 -03:00
dmaengine This has been a busy cycle for documentation work. Highlights include: 2020-03-30 12:45:23 -07:00
driver-model docs: driver.rst: supress two ReSt warnings 2020-03-10 11:54:04 -06:00
early-userspace docs: add SPDX tags to new index files 2019-07-15 11:03:03 -03:00
firmware Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-03-30 16:13:08 -07:00
fpga
gpio docs: gpio: driver.rst: don't mark literal blocks twice 2020-03-25 09:50:44 +01:00
i3c
iio docs: Do not seek kerneldoc comments in hw-consumer.h 2019-05-24 14:43:42 -06:00
md docs: add SPDX tags to new index files 2019-07-15 11:03:03 -03:00
mei mei: docs: update mei documentation 2019-06-06 16:51:37 +02:00
memory-devices docs: add SPDX tags to new index files 2019-07-15 11:03:03 -03:00
mmc docs: add SPDX tags to new index files 2019-07-15 11:03:03 -03:00
mtd docs: mtd: Update spi nor reference driver 2019-09-06 08:51:39 -06:00
nfc docs: add SPDX tags to new index files 2019-07-15 11:03:03 -03:00
nvdimm docs: don't use nested tables 2019-07-15 11:03:04 -03:00
pci
phy docs: phy: Drop duplicate 'be made' 2019-07-26 08:15:26 -06:00
pm docs: remove extra conf.py files 2019-07-17 06:57:52 -03:00
rapidio docs: add SPDX tags to new index files 2019-07-15 11:03:03 -03:00
serial tty: n_gsm: add ioctl to map serial device to mux'ed tty 2019-09-04 12:43:54 +02:00
soundwire soundwire: stream: update state machine and add state checks 2020-02-13 15:57:37 +05:30
thermal Documentation: cpu-idle-cooling: fix a SEVERE docs build failure 2020-01-31 10:50:33 +01:00
usb usb: typec: altmode: Remove the notification chain 2020-02-12 10:51:21 -08:00
xilinx docs: driver-api: add xilinx driver API documentation 2019-07-15 11:03:02 -03:00
basics.rst docs: Do not seek comments in kernel/rcu/tree_plugin.h 2019-05-24 14:23:40 -06:00
clk.rst docs: clk: fix struct syntax 2019-06-07 11:35:15 -06:00
component.rst
connector.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
console.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
dcdbas.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
devfreq.rst docs: Add initial documentation for devfreq 2019-11-19 13:16:53 -07:00
device-io.rst
device_connection.rst
device_link.rst driver core: Add support for linking devices during device addition 2019-10-04 17:29:50 +02:00
dma-buf.rst doc: drm: Update references to previously renamed files 2019-10-25 12:46:32 +01:00
edac.rst
eisa.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
firewire.rst
frame-buffer.rst
generic-counter.rst docs: driver-api: generic-counter: Update Count and Signal data types 2019-10-18 19:47:38 +01:00
hsi.rst
i2c.rst
index.rst Documentation: Add io_ordering.rst to driver-api manual 2020-03-10 11:33:19 -06:00
infiniband.rst infiniband: add a Documentation driver-api chapter for Infiniband 2019-10-22 14:52:56 -03:00
infrastructure.rst docs: No structured comments in kernel/dma/coherent.c 2019-10-01 08:43:21 -06:00
input.rst
interconnect.rst interconnect: Add interconnect_graph file to debugfs 2019-12-16 09:49:54 +02:00
io-mapping.rst Documentation: Add io-mapping.rst to driver-api manual 2020-03-10 11:33:15 -06:00
io_ordering.rst Documentation: Add io_ordering.rst to driver-api manual 2020-03-10 11:33:19 -06:00
ioctl.rst docs: move core-api/ioctl.rst to driver-api/ 2020-03-10 11:21:08 -06:00
ipmb.rst drivers: ipmi: Support raw i2c packet in IPMB 2019-12-11 13:21:36 -06:00
isa.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
isapnp.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
libata.rst scsi: docs: convert scsi_eh.txt to ReST 2020-03-11 23:08:01 -04:00
lightnvm-pblk.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
men-chameleon-bus.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
message-based.rst
misc_devices.rst
miscellaneous.rst
mtdnand.rst
ntb.rst New feature to add support for NTB virtual MSI interrupts, the ability 2019-07-21 09:46:59 -07:00
nvmem.rst nvmem: core: add nvmem_device_find 2019-10-07 09:47:37 -07:00
parport-lowlevel.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
pinctl.rst docs/pinctrl: fix compile errors in example code 2019-07-29 00:20:09 +02:00
pps.rst docs: driver-api: add remaining converted dirs to it 2019-07-15 11:03:03 -03:00
pti_intel_mid.rst docs: driver-api: pti_intel_mid: Enable syntax highlighting for C code block 2019-10-18 09:40:13 -06:00
ptp.rst docs: driver-api: add remaining converted dirs to it 2019-07-15 11:03:03 -03:00
pwm.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
regulator.rst
rfkill.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
s390-drivers.rst docs: s390: convert docs to ReST and rename to *.rst 2019-06-11 09:48:14 +02:00
scsi.rst
slimbus.rst
sm501.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
smsc_ece1099.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
sound.rst
spi.rst
switchtec.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
sync_file.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
target.rst docs: No structured comments in target_core_device.c 2019-05-24 15:01:30 -06:00
uio-howto.rst uio: Documentation: Add information on using uio_pdrv_genirq with DT 2019-09-04 13:42:43 +02:00
vfio-mediated-device.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
vfio.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
vme.rst
w1.rst
xillybus.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
zorro.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00