Commit Graph

359 Commits

Author SHA1 Message Date
Wolfram Sang
0161ee9dd3 Documentation: i2c: add fault code for not supporting 10 bit addresses
Document the specific fault code when 10 bit addresses cannot be
supported. It is used for years, only the documentation slipped through
the cracks.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2023-10-29 21:03:35 +01:00
Jarkko Nikula
8c56f9ef25 i2c: i801: Add support for Intel Birch Stream SoC
Add SMBus PCI ID on Intel Birch Stream SoC.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2023-10-10 21:46:16 +02:00
Linus Torvalds
307d59039f media updates for v6.6-rc1
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Merge tag 'media/v6.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

Pull media updates from Mauro Carvalho Chehab:

 - new i2c drivers: ds90ub913, ds90ub953, ds90ub960, dw9719, ds90ub913

 - new Intel IVSC MEI drivers

 - some Mediatek platform drivers were moved to a common location

 - Intel atomisp2 driver is now working with the main ov2680 driver. Due
   to that, the atomisp2 ov2680 staging one was removed

 - the bttv driver was finally converted to videobuf2 framework. This
   was the last one upstream using videobuf version 1 core. We'll likely
   remove the old videobuf framework on 6.7

 - lots of improvements at atomisp driver: it now works with normal I2C
   sensors. Several compile-mode dependecies to select between ISP2400
   and ISP2401 are now solved in runtime

 - a new ipu-bridge logic was added to work with IVSC MEI drivers

 - venus driver gained better support for new VPU versions

 - the v4l core async framework has gained lots of improvements and
   cleanups

 - lots of other cleanups, improvements and driver fixes

* tag 'media/v6.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (358 commits)
  media: ivsc: Add ACPI dependency
  media: bttv: convert to vb2
  media: bttv: use audio defaults for winfast2000
  media: bttv: refactor bttv_set_dma()
  media: bttv: move vbi_skip/vbi_count out of buffer
  media: bttv: remove crop info from bttv_buffer
  media: bttv: remove tvnorm field from bttv_buffer
  media: bttv: remove format field from bttv_buffer
  media: bttv: move do_crop flag out of bttv_fh
  media: bttv: copy vbi_fmt from bttv_fh
  media: bttv: copy vid fmt/width/height from fh
  media: bttv: radio use v4l2_fh instead of bttv_fh
  media: bttv: replace BUG with WARN_ON
  media: bttv: use video_drvdata to get bttv
  media: i2c: rdacm21: Fix uninitialized value
  media: coda: Remove duplicated include
  media: vivid: fix the racy dev->radio_tx_rds_owner
  media: i2c: ccs: Check rules is non-NULL
  media: i2c: ds90ub960: Fix PLL config for 1200 MHz CSI rate
  media: i2c: ds90ub953: Fix use of uninitialized variables
  ...
2023-09-01 12:21:32 -07:00
Uwe Kleine-König
7d711966f9 i2c: Update documentation to use .probe() again
Since commit 03c835f498 ("i2c: Switch .probe() to not take an id
parameter") .probe() is the recommended callback to implement (again).
Reflect this in the documentation and don't mention .probe_new() any
more.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2023-08-14 18:14:04 +02:00
Luca Ceresoli
a076a860ac media: i2c: add I2C Address Translator (ATR) support
An ATR is a device that looks similar to an i2c-mux: it has an I2C
slave "upstream" port and N master "downstream" ports, and forwards
transactions from upstream to the appropriate downstream port. But it
is different in that the forwarded transaction has a different slave
address. The address used on the upstream bus is called the "alias"
and is (potentially) different from the physical slave address of the
downstream chip.

Add a helper file (just like i2c-mux.c for a mux or switch) to allow
implementing ATR features in a device driver. The helper takes care of
adapter creation/destruction and translates addresses at each transaction.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
2023-07-14 13:11:44 +02:00
Jarkko Nikula
bcfc2ab7f4 i2c: i801: Add support for Intel Meteor Lake PCH-S
Add SMBus PCI ID on Intel Meteor Lake PCH-S.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2023-06-05 10:13:48 +02:00
Randy Dunlap
38bd413638 Documentation: i2c: correct spelling
Correct spelling problems for Documentation/i2c/ as reported
by codespell.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2023-02-15 20:59:44 +01:00
Quan Nguyen
09a7bab68b docs: i2c: slave-interface: return errno when handle I2C_SLAVE_WRITE_REQUESTED
In case backend is not ready, ie: fail to wakeup or initialization, on
the returning of the I2C_SLAVE_WRITE_REQUESTED event, bus driver should
aware the backend status and might auto sending NACK on the next
incoming bytes for I2C master to retry.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
Links:https://lore.kernel.org/linux-arm-kernel/556fa9e1-c54b-8370-4de7-c2d3ec7d6906@os.amperecomputing.com/
[wsa: made some wording more precise]
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-09-28 21:41:59 +02:00
Wolfram Sang
85f17d677f Merge branch 'master' into i2c/for-mergewindow 2022-09-27 21:33:37 +02:00
Wolfram Sang
9d55e7b0bd Documentation: i2c: fix references to other documents
Similar to commit fe99b81948 ("docs: i2c: i2c-sysfs: fix hyperlinks"),
make other links in documentation consistent with the preferred way.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-09-16 20:53:58 +01:00
Wolfram Sang
d819524d31 Merge tag 'v6.0-rc5' into i2c/for-mergewindow
Linux 6.0-rc5
2022-09-16 20:42:18 +01:00
Bruce Duncan
53b774718f docs: i2c: piix4: Fix typos, add markup, drop link
[JD: Update the subject
     One more typo fixed
     Drop the link to lm-sensors' README, it's irrelevant]

Signed-off-by: Bruce Duncan <bwduncan@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-29 22:08:40 +02:00
Luca Ceresoli
92d5d6434d docs: i2c: i2c-topology: reorder sections more logically
The sequence of sections is a bit confusing here:

 * we list the mux locking scheme for existing drivers before introducing
   what mux locking schemes are
 * we list the caveats for each locking scheme (which are tricky) before
   the example of the simple use case

Restructure it entirely with the following logic:

 * Intro ("I2C muxes and complex topologies")
 * Locking
   - mux-locked
     - example
     - caveats
   - parent-locked
     - example
     - caveats
 * Complex examples
 * Mux type of existing device drivers

While there, also apply some other improvements:

 * convert the caveat list from a table (with only one column carrying
   content) to a bullet list.
 * add a small introductory text to bridge the gap from listing the use
   cases to telling about the hardware components to handle them and then
   the device drivers that implement those.
 * make empty lines usage more uniform

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-29 12:28:13 +02:00
Luca Ceresoli
12c035a1a8 docs: i2c: i2c-topology: fix incorrect heading
"Etc" here was never meant to be a heading, it became one while converting
to ReST.

It would be easy to just convert it to plain text, but rather remove it and
add an introductory text before the list that conveys the same meaning but
with a better reading flow.

Fixes: ccf988b66d ("docs: i2c: convert to ReST and add to driver-api bookset")
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-29 12:28:13 +02:00
Luca Ceresoli
6292b4ba60 docs: i2c: i2c-topology: fix typo
"intension" should have probably been "intention", however "intent" seems
even better.

Reported-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-29 12:28:13 +02:00
Uwe Kleine-König
ed5c2f5fd1 i2c: Make remove callback return void
The value returned by an i2c driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com>
Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Crt Mori <cmo@melexis.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/*
Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5
Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio
Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860
Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b
Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes
Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power
Acked-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-16 12:46:26 +02:00
Luca Ceresoli
fe99b81948 docs: i2c: i2c-sysfs: fix hyperlinks
dts files cannot be linked conveniently, thus replace them with literal
formatting.

The links to other rst pages are broken, fix them using the proper syntax.

Fixes: 31df7195b1 ("Documentation: i2c: Add doc for I2C sysfs")
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-11 23:25:05 +02:00
Luca Ceresoli
55bdfb8b55 docs: i2c: i2c-sysfs: improve wording
Improve wording in a couple sentences.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
[wsa: improved a little more]
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-11 23:25:05 +02:00
Luca Ceresoli
43310e279d docs: i2c: instantiating-devices: add syntax coloring to dts and C blocks
These blocks can be nicely coloured via Sphinx.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-11 23:07:19 +02:00
Luca Ceresoli
6c12ec2772 docs: i2c: smbus-protocol: improve DataLow/DataHigh definition
Use a more professional wording.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-11 23:06:11 +02:00
Luca Ceresoli
0721ceee2f docs: i2c: i2c-protocol: remove unused legend items
"Comm", "Count", "DataLow", "DataHigh" are not used in this section.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-11 23:05:11 +02:00
Luca Ceresoli
24d129d4f2 docs: i2c: i2c-protocol,smbus-protocol: remove nonsense words
"as usual" does not mean much here, especially as these are introductory
sections and 10-bit addressing hasn't been introduced yet.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-11 23:03:02 +02:00
Luca Ceresoli
9bbebdf778 docs: i2c: i2c-protocol: update introductory paragraph
This sentence dates back to the pre-git era and it does not look very
professional... As there is no clear definition of "finished", and given
this page is already a pretty good overview, not to mention it is not the
kernel responsibility to document the protocol in detail, let's update the
text accordingly.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-11 23:02:52 +02:00
Jarkko Nikula
24fff66f1f i2c: i801: Add support for Intel Meteor Lake-P
Add SMBus PCI ID on Intel Meteor Lake-P.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-07-06 16:04:48 +02:00
Stephen Kitt
32d4536133 docs: i2c: reference simple probes
Instead of documenting old-style probes, reference "simple probes" and
document the i2c_match_id function. This might help reduce the use of
two-argument probes in new code.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-05-04 22:35:19 +02:00
Jarkko Nikula
9c02d4011e i2c: i801: Add support for Intel Raptor Lake PCH-S
Add SMBus PCI ID on Intel Raptor Lake PCH-S.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-02-15 10:03:40 +01:00
Deep Majumder
c116fe1e18 Docs: Fixes link to I2C specification
The link to the I2C specification is broken. Although
"https://www.nxp.com" hosts Rev 7 (2021) of this specification, it is
behind a login-wall. Thus, an additional link has been added (which
doesn't require a login) and the NXP official docs link has been
updated.

Signed-off-by: Deep Majumder <deep@fastmail.in>
[wsa: minor updates to text and commit message]
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-12-31 14:39:28 +01:00
Miquel Raynal
bed68f4f4d docs: i2c: smbus-protocol: mention the repeated start condition
Sr is a repeated start, it is used in both I2C and SMBus protocols.

Provide its description and replace start ("S") conditions with repeated
start ("Sr") conditions when relevant. This allows the documentation to
match the SMBus specification available at [1].

[1] http://www.smbus.org/specs/SMBus_3_1_20180319.pdf

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-11-23 12:59:41 +01:00
Hu Haowen
3f12cc4bb0 Documentation: i2c: add i2c-sysfs into index
Append i2c-sysfs to toctree in order to get rid of building warnings.

Fixes: 31df7195b1 ("Documentation: i2c: Add doc for I2C sysfs")
Signed-off-by: Hu Haowen <src.res@email.cn>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-08-10 22:58:32 +02:00
Linus Torvalds
855ff900b8 Merge branch 'i2c/for-mergewindow' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wolfram Sang:

 - core supports now bus regulators controlling power for SCL/SDA

 - quite some DT binding conversions to YAML

 - added a seperate DT binding for the optional SMBus Alert feature

 - documentation with examples how to deal with I2C sysfs files

 - some bigger rework for the i801 driver

 - and a few usual driver updates

* 'i2c/for-mergewindow' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (42 commits)
  i2c: ali1535: mention that the device should not be disabled
  i2c: mpc: Restore reread of I2C status register
  i2c: core-smbus: Expose PEC calculate function for generic use
  Documentation: i2c: Add doc for I2C sysfs
  i2c: core: Disable client irq on reboot/shutdown
  dt-bindings: i2c: update bindings for MT8195 SoC
  i2c: imx: Fix some checkpatch warnings
  i2c: davinci: Simplify with dev_err_probe()
  i2c: cadence: Simplify with dev_err_probe()
  i2c: xiic: Simplify with dev_err_probe()
  i2c: cadence: Clear HOLD bit before xfer_size register rolls over
  dt-bindings: i2c: ce4100: Replace "ti,pcf8575" by "nxp,pcf8575"
  i2c: i801: Improve i801_setup_hstcfg
  i2c: i801: Use driver name constant instead of function dev_driver_string
  i2c: i801: Simplify initialization of i2c_board_info in i801_probe_optional_slaves
  i2c: i801: Improve status polling
  i2c: cht-wc: Replace of_node by NULL
  i2c: riic: Add RZ/G2L support
  dt-bindings: i2c: renesas,riic: Document RZ/G2L I2C controller
  dt-bindings: i2c: renesas,iic: Convert to json-schema
  ...
2021-07-04 11:47:18 -07:00
Alex Qiu
31df7195b1 Documentation: i2c: Add doc for I2C sysfs
This doc helps Linux users navigate through I2C sysfs and learn
the system I2C topology.

Signed-off-by: Alex Qiu <xqiu@google.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-06-25 15:58:25 +02:00
Mauro Carvalho Chehab
25edd3a162 docs: i2c: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/569722e3f7d73d746c145ea78d2b4fbe5defee90.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:38 -06:00
Wolfram Sang
b39ab96aa8 i2c: testunit: add support for block process calls
Devices offering SMBus block process calls are rare, so add it to the
testunit. This is also a good test case for testing proper
I2C_M_RECV_LEN flag handling of I2C bus masters emulating SMBus.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-02-12 11:11:04 +01:00
Wolfram Sang
40daf09a30 Documentation: i2c: add testunit docs to index
Fixes: a8335c64c5 ("i2c: add slave testunit driver")
Reported-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-10-05 22:57:45 +02:00
Wolfram Sang
35baff672f i2c: testunit: improve documentation
Mention that new CMDs will be NACKed while the old one is still
on-going, that the I2C address parameter of READ_BYTES is 7 bit only,
and reword one paragraph to be more precise.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-10-05 22:57:39 +02:00
Jarkko Nikula
332fdaebb6 i2c: i801: Add support for Intel Alder Lake PCH-S
Add PCI ID of SMBus controller on Intel Alder Lake PCH-S

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-09-29 21:34:26 +02:00
Wolfram Sang
a8335c64c5 i2c: add slave testunit driver
Here is an I2C slave backend driver which allows to test some uncommon
functionalities of the I2C and SMBus world. Usually, you need specific
devices to test e.g. SMBus Host Notify and such. With this driver you
just need the slave interface of another I2C controller.

This initial version has testcases for multi-master and SMBus Host
Notify. Already planned but not yet implemented are SMBus Alert and
messages with I2C_M_RECV_LEN.

Please read the documentation for further details.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-09-21 11:02:17 +02:00
Linus Torvalds
e764a1e323 Merge branch 'i2c/for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wolfram Sang:

 - bus recovery can now be given a pinctrl handle and the I2C core will
   do all the steps to switch to/from GPIO which can save quite some
   boilerplate code from drivers

 - "fallthrough" conversion

 - driver updates, mostly ID additions

* 'i2c/for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (32 commits)
  i2c: iproc: fix race between client unreg and isr
  i2c: eg20t: use generic power management
  i2c: eg20t: Drop PCI wakeup calls from .suspend/.resume
  i2c: mediatek: Fix i2c_spec_values description
  i2c: mediatek: Add i2c compatible for MediaTek MT8192
  dt-bindings: i2c: update bindings for MT8192 SoC
  i2c: mediatek: Add access to more than 8GB dram in i2c driver
  i2c: mediatek: Add apdma sync in i2c driver
  i2c: i801: Add support for Intel Tiger Lake PCH-H
  i2c: i801: Add support for Intel Emmitsburg PCH
  i2c: bcm2835: Replace HTTP links with HTTPS ones
  Documentation: i2c: dev: 'block process call' is supported
  i2c: at91: Move to generic GPIO bus recovery
  i2c: core: treat EPROBE_DEFER when acquiring SCL/SDA GPIOs
  i2c: core: add generic I2C GPIO recovery
  dt-bindings: i2c: add generic properties for GPIO bus recovery
  i2c: rcar: avoid race when unregistering slave
  i2c: tegra: Avoid tegra_i2c_init_dma() for Tegra210 vi i2c
  i2c: tegra: Fix runtime resume to re-init VI I2C
  i2c: tegra: Fix the error path in tegra_i2c_runtime_resume
  ...
2020-08-13 18:41:00 -07:00
Linus Torvalds
dddcbc139e A handful of obvious fixes that wandered in during the merge window.
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Merge tag 'docs-5.9-2' of git://git.lwn.net/linux

Pull documentation fixes from Jonathan Corbet:
 "A handful of obvious fixes that wandered in during the merge window"

* tag 'docs-5.9-2' of git://git.lwn.net/linux:
  Documentation/locking/locktypes: fix the typo
  doc/zh_CN: resolve undefined label warning in admin-guide index
  doc/zh_CN: fix title heading markup in admin-guide cpu-load
  docs: remove the 2.6 "Upgrading I2C Drivers" guide
  docs: Correct the release date of 5.2 stable
  mailmap: Update comments for with format and more detalis
  docs: cdrom: Fix a typo and rst markup
  Doc: admin-guide: use correct legends in kernel-parameters.txt
  Documentation/features: refresh RISC-V arch support files
  documentation: coccinelle: Improve command example for make C={1,2}
  Core-api: Documentation: Replace deprecated :c:func: Usage
  Dev-tools: Documentation: Replace deprecated :c:func: Usage
  Filesystems: Documentation: Replace deprecated :c:func: Usage
  docs: trace: fix a typo
2020-08-13 13:57:45 -07:00
Stephen Kitt
7033a95ab4 docs: remove the 2.6 "Upgrading I2C Drivers" guide
All the drivers have long since been upgraded, and all the important
information here is also included in the "Implementing I2C device
drivers" guide.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Reviewed-by: Wolfram Sang <wsa@kernel.org>
Link: https://lore.kernel.org/r/20200806161456.8680-1-steve@sk2.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2020-08-11 10:49:32 -06:00
Mika Westerberg
12745b071e i2c: i801: Add support for Intel Emmitsburg PCH
Add support for SMBus controller on Intel Emmitsburg PCH. This is the
same IP as used in Cannon Lake and derivatives.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-08-05 11:52:28 +02:00
Wolfram Sang
cee807cf9e Documentation: i2c: dev: 'block process call' is supported
And it has been for a while (since 2012 at least), only it was not
documented. Add it.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-08-05 11:52:28 +02:00
Linus Torvalds
2324d50d05 It's been a busy cycle for documentation - hopefully the busiest for a
while to come.  Changes include:
 
  - Some new Chinese translations
 
  - Progress on the battle against double words words and non-HTTPS URLs
 
  - Some block-mq documentation
 
  - More RST conversions from Mauro.  At this point, that task is
    essentially complete, so we shouldn't see this kind of churn again for a
    while.  Unless we decide to switch to asciidoc or something...:)
 
  - Lots of typo fixes, warning fixes, and more.
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Merge tag 'docs-5.9' of git://git.lwn.net/linux

Pull documentation updates from Jonathan Corbet:
 "It's been a busy cycle for documentation - hopefully the busiest for a
  while to come. Changes include:

   - Some new Chinese translations

   - Progress on the battle against double words words and non-HTTPS
     URLs

   - Some block-mq documentation

   - More RST conversions from Mauro. At this point, that task is
     essentially complete, so we shouldn't see this kind of churn again
     for a while. Unless we decide to switch to asciidoc or
     something...:)

   - Lots of typo fixes, warning fixes, and more"

* tag 'docs-5.9' of git://git.lwn.net/linux: (195 commits)
  scripts/kernel-doc: optionally treat warnings as errors
  docs: ia64: correct typo
  mailmap: add entry for <alobakin@marvell.com>
  doc/zh_CN: add cpu-load Chinese version
  Documentation/admin-guide: tainted-kernels: fix spelling mistake
  MAINTAINERS: adjust kprobes.rst entry to new location
  devices.txt: document rfkill allocation
  PCI: correct flag name
  docs: filesystems: vfs: correct flag name
  docs: filesystems: vfs: correct sync_mode flag names
  docs: path-lookup: markup fixes for emphasis
  docs: path-lookup: more markup fixes
  docs: path-lookup: fix HTML entity mojibake
  CREDITS: Replace HTTP links with HTTPS ones
  docs: process: Add an example for creating a fixes tag
  doc/zh_CN: add Chinese translation prefer section
  doc/zh_CN: add clearing-warn-once Chinese version
  doc/zh_CN: add admin-guide index
  doc:it_IT: process: coding-style.rst: Correct __maybe_unused compiler label
  futex: MAINTAINERS: Re-add selftests directory
  ...
2020-08-04 22:47:54 -07:00
Randy Dunlap
e83adbca5b Documentation: i2c: eliminate duplicated word
Drop doubled word "new".

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Wolfram Sang <wsa@kernel.org>
Cc: linux-i2c@vger.kernel.org
Link: https://lore.kernel.org/r/20200707180414.10467-10-rdunlap@infradead.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2020-07-13 09:44:06 -06:00
Wolfram Sang
59d3d6042d i2c: slave-eeprom: update documentation
Add more details which have either been missing ever since or describe
recent additions.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-07-04 08:17:53 +02:00
Daniel Schaefer
a5765124e6 Documentation/i2c: SMBus start signal is S not A
Just like all other I2C/SMBus commands, the start signal for the SMBus
Quick Command is S, not A.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Daniel Schaefer <git@danielschaefer.me>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2020-06-19 09:21:48 +02:00
Mauro Carvalho Chehab
36536a02e5 docs: i2c: rename i2c.svg to i2c_bus.svg
When generating the PDF output, the Documentation/i2c dir
will generate an i2c.pdf. The same happens with i2c.svg:
it will also produce a file with the same name, at the same dir.

This causes errors when building the PDF output. So, rename the
image to i2c_bus.svg.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Link: https://lore.kernel.org/r/ecf3d51909ce46b3e84a1df4b36f07d76989e5da.1586881715.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2020-04-20 15:45:41 -06:00
Wolfram Sang
ed68052226 i2c: convert SMBus alert setup function to return an ERRPTR
Only few drivers use this call, so drivers and I2C core are converted at
once with this patch. By simply using i2c_new_client_device() instead of
i2c_new_device(), we easily can return an ERRPTR for this function as
well. To make out of tree users aware that something changed, the
function is renamed to i2c_new_smbus_alert_device().

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-03-10 12:19:52 +01:00
Luca Ceresoli
4fcb445ec6 docs: i2c: writing-clients: properly name the stop condition
In I2C there is no such thing as a "stop bit". Use the proper naming: "stop
condition".

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Reported-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-01-29 22:02:09 +01:00
Luca Ceresoli
ca5dbb0272 docs: i2c: i2c-protocol: use same wording as smbus-protocol
In smbus-protocol.rst we use the text "Implemented by" for the same meaning
as "This corresponds to". Change everything to "Implemented by" for
coherency.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Reported-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2020-01-29 22:02:07 +01:00