linux/Documentation/driver-api
Linus Torvalds 8148c17b17 This is the bulk of the GPIO changes for the v5.2 kernel cycle:
Core changes:
 - The gpiolib MMIO driver has been enhanced to handle two direction
   registers, i.e. one register to set lines as input and one register
   to set lines as output. It turns out some silicon engineer thinks
   the ability to configure a line as input and output at the same
   time makes sense, this can be debated but includes a lot of analog
   electronics reasoning, and the registers are there and need to
   be handled consistently. Unsurprisingly, we enforce the lines to
   be either inputs or outputs in such schemes.
 - Send in the proper argument value to .set_config() dispatched to
   the pin control subsystem. Nobody used it before, now someone
   does, so fix it to work as expected.
 - The ACPI gpiolib portions can now handle pin bias setting (pull up
   or pull down). This has been in the ACPI spec for years and we
   finally have it properly integrated with Linux GPIOs. It was based
   on an observation from Andy Schevchenko that Thomas Petazzoni's
   changes to the core for biasing the PCA950x GPIO expander actually
   happen to fit hand-in-glove with what the ACPI core needed.
   Such nice synergies happen sometimes.
 
 New drivers:
 - A new driver for the Mellanox BlueField GPIO controller. This is
   using 64bit MMIO registers and can configure lines as inputs
   and outputs at the same time and after improving the MMIO library
   we handle it just fine. Interesting.
 - A new IXP4xx proper gpiochip driver with hierarchical interrupts
   should be coming in from the ARM SoC tree as well.
 
 Driver enhancements:
 - The PCA053x driver handles the CAT9554 GPIO expander.
 - The PCA053x driver handles the NXP PCAL6416 GPIO expander.
 - Wake-up support on PCA053x GPIO lines.
 - OMAP now does a nice asynchronous IRQ handling on wake-ups by
   letting everything wake up on edges, and this makes runtime PM
   work as expected too.
 
 Misc:
 - Several cleanups such as devres fixes.
 - Get rid of some languager comstructs that cause problems when
   compiling with LLVMs clang.
 - Documentation review and update.
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Merge tag 'gpio-v5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull gpio updates from Linus Walleij:
 "This is the bulk of the GPIO changes for the v5.2 kernel cycle. A bit
  later than usual because I was ironing out my own mistakes. I'm
  holding some stuff back for the next kernel as a result, and this
  should be a healthy and well tested batch.

  Core changes:

   - The gpiolib MMIO driver has been enhanced to handle two direction
     registers, i.e. one register to set lines as input and one register
     to set lines as output. It turns out some silicon engineer thinks
     the ability to configure a line as input and output at the same
     time makes sense, this can be debated but includes a lot of analog
     electronics reasoning, and the registers are there and need to be
     handled consistently. Unsurprisingly, we enforce the lines to be
     either inputs or outputs in such schemes.

   - Send in the proper argument value to .set_config() dispatched to
     the pin control subsystem. Nobody used it before, now someone does,
     so fix it to work as expected.

   - The ACPI gpiolib portions can now handle pin bias setting (pull up
     or pull down). This has been in the ACPI spec for years and we
     finally have it properly integrated with Linux GPIOs. It was based
     on an observation from Andy Schevchenko that Thomas Petazzoni's
     changes to the core for biasing the PCA950x GPIO expander actually
     happen to fit hand-in-glove with what the ACPI core needed. Such
     nice synergies happen sometimes.

  New drivers:

   - A new driver for the Mellanox BlueField GPIO controller. This is
     using 64bit MMIO registers and can configure lines as inputs and
     outputs at the same time and after improving the MMIO library we
     handle it just fine. Interesting.

   - A new IXP4xx proper gpiochip driver with hierarchical interrupts
     should be coming in from the ARM SoC tree as well.

  Driver enhancements:

   - The PCA053x driver handles the CAT9554 GPIO expander.

   - The PCA053x driver handles the NXP PCAL6416 GPIO expander.

   - Wake-up support on PCA053x GPIO lines.

   - OMAP now does a nice asynchronous IRQ handling on wake-ups by
     letting everything wake up on edges, and this makes runtime PM work
     as expected too.

  Misc:

   - Several cleanups such as devres fixes.

   - Get rid of some languager comstructs that cause problems when
     compiling with LLVMs clang.

   - Documentation review and update"

* tag 'gpio-v5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (85 commits)
  gpio: Update documentation
  docs: gpio: convert docs to ReST and rename to *.rst
  gpio: sch: Remove write-only core_base
  gpio: pxa: Make two symbols static
  gpiolib: acpi: Respect pin bias setting
  gpiolib: acpi: Add acpi_gpio_update_gpiod_lookup_flags() helper
  gpiolib: acpi: Set pin value, based on bias, more accurately
  gpiolib: acpi: Change type of dflags
  gpiolib: Introduce GPIO_LOOKUP_FLAGS_DEFAULT
  gpiolib: Make use of enum gpio_lookup_flags consistent
  gpiolib: Indent entry values of enum gpio_lookup_flags
  gpio: pca953x: add support for pca6416
  dt-bindings: gpio: pca953x: document the nxp,pca6416
  gpio: pca953x: add pcal6416 to the of_device_id table
  gpio: gpio-omap: Remove conditional pm_runtime handling for GPIO interrupts
  gpio: gpio-omap: configure edge detection for level IRQs for idle wakeup
  tracing: stop making gpio tracing configurable
  gpio: pca953x: Configure wake-up path when wake-up is enabled
  gpio: of: Optimize quirk checks
  gpio: mmio: Drop bgpio_dir_inverted
  ...
2019-05-11 10:54:43 -04:00
..
80211 mac80211: fix missing/malformed documentation 2019-02-01 12:11:13 +01:00
acpi Documentation: ACPI: move scan_handlers.txt to driver-api/acpi and convert to reST 2019-04-25 23:07:19 +02:00
dmaengine doc:dmaengine: clarify DMA desc. pointer after submission 2019-02-11 08:40:16 -07:00
firmware Documentation: driver-api: add stratix10 service layer 2018-11-26 20:15:07 +01:00
fpga docs: fpga: document programming fpgas using regions 2018-10-16 11:13:50 +02:00
gpio gpio: Update documentation 2019-05-07 16:32:12 +02:00
i3c docs: driver-api: Add I3C documentation 2018-11-12 10:33:49 +01:00
iio docs: driver-api: iio: fix errors in documentation 2019-03-04 12:51:17 -07:00
pci Documentation: Kill all references to mmiowb() 2019-04-08 12:00:45 +01:00
pm Documentation: PM: Unify copyright notices 2019-04-08 12:57:47 +02:00
soundwire Documentation: soundwire: Ensure that code is inside the code blocks 2019-04-02 07:59:56 -06:00
usb USB: core: Fix bug caused by duplicate interface PM usage counter 2019-04-19 21:15:13 +02:00
basics.rst docs: Introduce deprecated APIs list 2018-10-18 12:22:43 -06:00
clk.rst This time we have a good set of changes to the core framework that do some 2018-06-09 12:06:24 -07:00
component.rst drm/doc: document recommended component helper usage 2019-02-19 12:22:24 +01:00
conf.py doc-rst: make driver-api folder buildable stand-alone 2016-10-26 17:25:00 -06:00
device_connection.rst Documentation: driver-api: fix device_connection.rst kernel-doc error 2018-04-27 17:17:34 -06:00
device_link.rst typed componented support + i915/snd-hda changes 2019-02-11 20:32:31 +01:00
device-io.rst Documentation: Kill all references to mmiowb() 2019-04-08 12:00:45 +01:00
dma-buf.rst dma-fence: Polish kernel-doc for dma-fence.c 2018-07-04 12:18:37 +02:00
edac.rst edac.rst: move concepts dictionary from edac.h 2016-12-15 08:58:12 -02:00
firewire.rst FireWire: add driver-api Introduction section 2018-09-06 09:41:16 -06:00
frame-buffer.rst
generic-counter.rst docs: Add Generic Counter interface documentation 2019-04-25 21:33:38 +02:00
hsi.rst docs: split up serial-interfaces.rst 2016-09-06 09:14:52 -06:00
i2c.rst Merge branch 'i2c/for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-07-12 10:04:56 -07:00
index.rst Staging / IIO driver patches for 5.2-rc1 2019-05-07 13:31:29 -07:00
infrastructure.rst dma-mapping: move all DMA mapping code to kernel/dma 2018-06-14 08:50:37 +02:00
input.rst
libata.rst libata: remove ata_sff_data_xfer_noirq() 2018-07-11 10:45:28 -07:00
message-based.rst docs: Don't format internal MPT docs 2016-09-06 09:15:48 -06:00
misc_devices.rst docs-rst: core_api: move driver-specific stuff to drivers_api 2017-04-02 14:17:43 -06:00
miscellaneous.rst docs: driver-api: Remove trailing blank line 2017-08-07 14:27:45 -06:00
mtdnand.rst mtd: rawnand: Deprecate ->chip_delay 2018-10-03 11:12:25 +02:00
pinctl.rst pinctrl.txt: Remove outdated information 2019-01-28 10:07:58 +01:00
rapidio.rst docs-rst: convert rapidio book to ReST 2017-05-16 08:44:16 -03:00
regulator.rst docs: Convert the regulator docbook to RST 2017-01-31 17:31:41 -07:00
s390-drivers.rst s390/docs: reword airq section 2018-02-02 10:47:15 +01:00
scsi.rst scsi: target: add driver-api document 2018-04-20 19:14:40 -04:00
slimbus.rst slimbus: stream: add stream support 2018-07-07 17:25:23 +02:00
sound.rst
spi.rst docs: split up serial-interfaces.rst 2016-09-06 09:14:52 -06:00
target.rst scsi: target: add driver-api document 2018-04-20 19:14:40 -04:00
uio-howto.rst docs/uio: fix a grammar nitpick 2018-10-16 11:15:51 +02:00
vme.rst docs: Update VME documentation to include kerneldoc comments 2017-03-17 15:10:49 +09:00
w1.rst There has been a fair amount of activity in the docs tree this time 2017-07-03 21:13:25 -07:00