This device contains both master and slave controllers which can be
enabled simultaneously. Both controllers share the same SDA/SCL lines
and interrupt source but has separate control and status registers.
Controllers also works in loopback mode - slave device can communicate
with its own master controller internally. The controller can handle up
to two addresses, both of which may be 10 bit. Most of the logic
(sending (N)ACK, handling repeated start or switching between
write/read) is handled automatically which makes working with this
controller quite easy.

For simplicity, this patch adds basic support, limiting to only one
slave address. Support for the 2nd device may be added in the future.

Note that synchronize_irq() is used to ensure any running slave interrupt
is finished to make sure slave i2c_client structure can be safely used
by i2c_slave_event.
Signed-off-by: NKrzysztof Adamski <krzysztof.adamski@nokia.com>
Reviewed-by: NAlexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Since the 2019 a1k.org community re-print of these PCBs sports an
LTC2990 hwmon chip as an example use case, let this driver autoprobe
for that as well. If it is present, modprobing ltc2990 is sufficient.

The property_entry enables the three additional inputs available on
this particular board:

  in1 will be the voltage of the 5V rail, divided by 2.
  in2 will be the voltage of the 12V rail, divided by 4.
  temp3 will be measured using a PCB loop next the chip.
Signed-off-by: NMax Staudt <max@enpas.org>
Reviewed-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

This is the i2c-icy driver for the ICY board for Amiga computers.
It connects a PCF8584 I2C controller to the Zorro bus, providing I2C
connectivity. The original documentation can be found on Aminet:

https://aminet.net/package/docs/hard/icy

IRQ support is currently not implemented, as i2c-algo-pcf is built for
the ISA bus and a straight implementation of the same stack locks up a
Zorro machine.
Signed-off-by: NMax Staudt <max@enpas.org>
Reviewed-by: NGeert Uytterhoeven <geert@linux-m68k.org>
[wsa: added a missing newline reported by checkpatch]
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Now there is no need to keep our I2C driver to be initialized so early,
thus changing to module level and let it can be built as a module,
meanwhile adding some module information.
Signed-off-by: NBaolin Wang <baolin.wang@linaro.org>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add SMBUS PCI ID for Intel Tiger Lake -LP.
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

This patch adds a driver for the I2C controller found on the MediaTek
MT7621/7628/7688 SoC's. The base version of this driver was done by
Steven Liu (according to the copyright and MODULE_AUTHOR lines). It
can be found in the OpenWRT repositories (v4.14 at the time I looked).

The base driver had many issues, which are disccussed here:

https://en.forum.labs.mediatek.com/t/openwrt-15-05-loads-non-working-i2c-kernel-module-for-mt7688/1286/3

>From this link an enhanced driver version (complete rewrite, mayor
changes: support clock stretching, repeated start, ACK handling and
unlimited message length) from Jan Breuer can be found here:

https://gist.github.com/j123b567/9b555b635c2b4069d716b24198546954

This patch now adds this enhanced I2C driver to mainline.

Changes by Stefan Roese for upstreaming:
- Add devicetree bindings
- checkpatch clean
- Use module_platform_driver()
- Minor cosmetic enhancements
- Removed IO warpped functions
- Use readl_relaxed_poll_timeout() and drop poll_down_timeout()
- Removed superfluous barrier() in mtk_i2c_reset()
- Use i2c_8bit_addr_from_msg()
- Added I2C_FUNC_PROTOCOL_MANGLING
- Removed adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
Signed-off-by: NStefan Roese <sr@denx.de>
Tested-by: NRené van Dorst <opensource@vdorst.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add PCI ID for Intel Elkhart Lake PCH.
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Depending on MACH_JZ4780 prevent us from creating a generic kernel that
works on more than one MIPS board. Instead, we just depend on MIPS being
set.
Signed-off-by: NPaul Cercueil <paul@crapouillou.net>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

ARCH_BRCMSTB platforms have the BCM2835 I2C controllers, allow
selecting the i2c-bcm2835 driver on such platforms.
Signed-off-by: NKamal Dasu <kdasu.kdev@gmail.com>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The Hygon Dhyana CPU has the SMBus device with PCI device ID 0x790b,
which is the same as AMD CZ SMBus device. So add Hygon Dhyana support
to the i2c-piix4 driver by using the code path of AMD.
Signed-off-by: NPu Wen <puwen@hygon.cn>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add slave mode support to the iProc I2C driver.
Signed-off-by: NRayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Signed-off-by: NMichael Cheng <ccheng@broadcom.com>
Signed-off-by: NShreesha Rajashekar <shreesha.rajashekar@broadcom.com>
Signed-off-by: NRay Jui <ray.jui@broadcom.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

MP2 controllers have two separate busses, so may accommodate up to two I2C
adapters. Those adapters are listed in the ACPI namespace with the
"AMDI0011" HID, and probed by a platform driver.

Communication with the MP2 takes place through MMIO registers, or through
DMA for more than 32 bytes transfers.

This is major rework of the patch submitted by Nehal-bakulchandra Shah from
AMD (https://patchwork.kernel.org/patch/10597369/).

Most of the event handling of v3 was rewritten to make it work with more
than one bus (e.g on Ryzen-based Lenovo Yoga 530), and this version
contains many other improvements.
Signed-off-by: NElie Morisse <syniurge@gmail.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Slave mode driver is based on the concept of i2c-designware driver.
Signed-off-by: NJuergen Fitschen <me@jue.yt>
[ludovic.desroches@microchip.com: rework Kconfig and replace IS_ENABLED
by defined]
Signed-off-by: NLudovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add PCI ID for Intel Comet Lake PCH.
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Latest NVIDIA GPU card has USB Type-C interface. There is a
Type-C controller which can be accessed over I2C.

This driver adds I2C bus driver to communicate with Type-C controller.
I2C client driver will be part of USB Type-C UCSI driver.
Signed-off-by: NAjay Gupta <ajayg@nvidia.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
[wsa: kept Makefile sorting]
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Allow I2C_OMAP to be built for K3 platforms.
Signed-off-by: NVignesh R <vigneshr@ti.com>
Reviewed-by: NGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

ARCH_BCM_63XX which is used by ARM-based DSL SoCs from Broadcom uses the
same controller, make it possible to select the STB driver and update
the Kconfig and help text a bit.
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add Actions Semiconductor Owl family S900 I2C driver.
Signed-off-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: NPeter Rosin <peda@axentia.se>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

This bus driver supports the GENI based i2c hardware controller in the
Qualcomm SOCs. The Qualcomm Generic Interface (GENI) is a programmable
module supporting a wide range of serial interfaces including I2C. The
driver supports FIFO mode and DMA mode of transfer and switches modes
dynamically depending on the size of the transfer.
Signed-off-by: NKarthikeyan Ramasubramanian <kramasub@codeaurora.org>
Signed-off-by: NSagar Dharia <sdharia@codeaurora.org>
Signed-off-by: NGirish Mahadevan <girishm@codeaurora.org>
Reviewed-by: NDouglas Anderson <dianders@chromium.org>
Reviewed-by: NStephen Boyd <swboyd@chromium.org>
Tested-by: NStephen Boyd <swboyd@chromium.org>
[wsa: squashed the MAINTAINER addition and a RPM fix by Evan Green]
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add register definitions for FSI-attached I2C master and functions to
access those registers over FSI. Add an FSI driver so that our I2C bus
is probed up during an FSI scan.
Signed-off-by: NEddie James <eajames@linux.vnet.ibm.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: NJoel Stanley <joel@jms.id.au>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Intel Ice Lake has the same SMBus host controller than Intel Cannon
Lake. Add the PCI ID to the drivers list of supported devices.
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
[jarkko.nikula@linux.intel.com: Add entries to Documentation and Kconfig]
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Make list of supported chipsets a little bit shorter by consolidating
names that belong to the same family.
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

The driver will not probe unless bq24190 is loaded, so
making it a dependency.
Signed-off-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This patch adds slave support for I2C controller embedded in STM32F7 SoC
Signed-off-by: NM'boumba Cedric Madianga <cedric.madianga@gmail.com>
Signed-off-by: NPierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Remove dependencies on HAS_DMA where a Kconfig symbol depends on another
symbol that implies HAS_DMA, and, optionally, on "|| COMPILE_TEST".
In most cases this other symbol is an architecture or platform specific
symbol, or PCI.

Generic symbols and drivers without platform dependencies keep their
dependencies on HAS_DMA, to prevent compiling subsystems or drivers that
cannot work anyway.

This simplifies the dependencies, and allows to improve compile-testing.
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: NMark Brown <broonie@kernel.org>
Acked-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

This is a cleaned up version of the I2C controller driver for
the Fujitsu F_I2C IP, which was never supported upstream, and
has now been incorporated into the Socionext SynQuacer SoC.
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
[wsa: updated MAINTAINERS entry and removed two empty lines]
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

The blackfin architecture is getting removed, so the
twi driver can also be removed.
Acked-by: NAaron Wu <aaron.wu@analog.com>
Acked-by: NWolfram Sang <wsa@the-dreams.de>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

Now that arch/metag/ has been removed, remove the METAG dependency from
the IMG SCB I2C device driver. The hardware is also present on MIPS SoCs
so the driver still has value.
Signed-off-by: NJames Hogan <jhogan@kernel.org>
Acked-by: NWolfram Sang <wsa@the-dreams.de>
Cc: linux-i2c@vger.kernel.org
Cc: linux-metag@vger.kernel.org

Commits adding PCI IDs for Intel Braswell and Kaby Lake PCH-H lacked the
respective Kconfig and Documentation/i2c/busses/i2c-i801 change. Add
them now.
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add fault injection capabilities to the i2c-gpio driver. When connected
to another I2C bus, it can create unusual states which the other I2C bus
master driver needs to handle. Only for debugging!
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>

Add device-properties to make the bq24292i charger connected to
the bus get its input-current-limit from the fusb302 Type-C port
controller which is used on boards with the cht-wc PMIC,
as well as regulator_init_data for the 5V boost converter on
the bq24292i.

Since this means we now hook-up the bq24292i to the fusb302 Type-C port
controller add a check for the ACPI device which instantiates the fusb302.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add PCI ID for Intel Cedar Fork PCH.
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

This patch adds initial support for the STM32F7 I2C controller.
Signed-off-by: NM'boumba Cedric Madianga <cedric.madianga@gmail.com>
Signed-off-by: NPierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add driver support for the Altera I2C Controller. The I2C
controller is soft IP for use in FPGAs.
Signed-off-by: NThor Thayer <thor.thayer@linux.intel.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Since the i2c driver of Spreadtrum can not be build as one module, thus
it should depend on CONFIG_I2C is build in.
Signed-off-by: NBaolin Wang <baolin.wang@spreadtrum.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

This patch adds the I2C controller driver for Spreadtrum SC9860 platform.
Signed-off-by: NBaolin Wang <baolin.wang@spreadtrum.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

The Intel Cherry Trail Whiskey Cove PMIC does not contain a builtin
battery charger, instead boards with this PMIC use an external TI
bq24292i charger IC, which is connected to a SMBUS controller built into
the PMIC.

This commit adds an i2c-bus driver for the PMIC's builtin SMBUS
controller. The probe function for this i2c-bus will also register an
i2c-client for the TI bq24292i charger after the i2c-bus has been
registered.

Note that several device-properties are set on the client-device to
tell the bq24190 power-supply driver to integrate the Whiskey Cove PMIC
and e.g. use the PMIC's BC1.2 detection (through extcon) to determine
the maximum input current.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Allow i2c-versatile to be enabled for ARM MPS platforms.
Signed-off-by: NRussell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Only certain system configurations may use the I2C slave mode so let the
support be optional. This allow reducing module size if needed:

   text    data     bss     dec     hex filename
  10328    1336      16   11680    2da0 drivers/i2c/busses/i2c-designware-core.ko
   7222    1136       8    8366    20ae drivers/i2c/busses/i2c-designware-core.ko
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: NLuis Oliveira <lolivei@synopsys.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>