Add an I2C bus driver for virtio para-virtualization.

The controller can be emulated by the backend driver in
any device model software by following the virtio protocol.

The device specification can be found on
https://lists.oasis-open.org/archives/virtio-comment/202101/msg00008.html.

By following the specification, people may implement different
backend drivers to emulate different controllers according to
their needs.
Co-developed-by: NConghui Chen <conghui.chen@intel.com>
Signed-off-by: NConghui Chen <conghui.chen@intel.com>
Signed-off-by: NJie Deng <jie.deng@intel.com>
Reviewed-by: NViresh Kumar <viresh.kumar@linaro.org>
Tested-by: NViresh Kumar <viresh.kumar@linaro.org>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Commit 1b00767f ("MIPS: Remove PMC MSP71xx platform") removes the
config PMC_MSP in ./arch/mips/Kconfig.

Hence, since then, the corresponding PMC MSP TWI/SMBus/I2C driver is
dead code. Remove this dead driver.
Signed-off-by: NLukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The HiSilicon Kunpeng I2C controller driver relies on ACPI to probe for
its presence.  Hence add a dependency on ACPI, to prevent asking the
user about this driver when configuring a kernel without ACPI firmware
support.

Fixes: d62fbdb9 ("i2c: add support for HiSilicon I2C controller")
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NYicong Yang <yangyicong@hisilicon.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Add HiSilicon I2C controller driver for the Kunpeng SoC. It provides
the access to the i2c busses, which connects to the eeprom, rtc, etc.

The driver works with IRQ mode, and supports basic I2C features and 10bit
address. The DMA is not supported.
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: NDmitry Osipenko <digetx@gmail.com>
Signed-off-by: NYicong Yang <yangyicong@hisilicon.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Create an i2c_adapter for CP2615's I2C master interface
Signed-off-by: NBence Csókás <bence98@sch.bme.hu>
[wsa: switched to '__packed', added some 'static' and an include]
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Commit 92c8c16f ("powerpc/embedded6xx: Remove C2K board support")
moved the last selector of CONFIG_MV64X60.

As it is not a user selectable config, it can be removed.
Signed-off-by: NChristophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Wolfram Sang <wsa@kernel.org> # for I2C
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/19e57d16692dcd1ca67ba880d7273a57fab416aa.1616085654.git.christophe.leroy@csgroup.eu

ARCH_SOCFPGA is being renamed to ARCH_INTEL_SOCFPGA so adjust the
32-bit ARM drivers to rely on new symbol.

The side effect is that the I2C_ALTERA will now be available for both
32-bit and 64-bit Intel SoCFPGA, even though it is used only for 32-bit.
Acked-by: NWolfram Sang <wsa@kernel.org>
Signed-off-by: NKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: NDinh Nguyen <dinguyen@kernel.org>

The zte zx platform is getting removed, so this driver is no
longer needed.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The I2C_SPRD uses Common Clock Framework thus it cannot be built on
platforms without it (e.g. compile test on MIPS with LANTIQ):

    /usr/bin/mips-linux-gnu-ld: drivers/i2c/busses/i2c-sprd.o: in function `sprd_i2c_probe':
    i2c-sprd.c:(.text.sprd_i2c_probe+0x254): undefined reference to `clk_set_parent'

Fixes: 4a2d5f66 ("i2c: Enable compile testing for more drivers")
Reported-by: Nkernel test robot <lkp@intel.com>
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: NBaolin Wang <baolin.wang7@gmail.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The ST-Ericsson U300 platform is getting removed, so this driver is no
longer needed.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The CSR SiRF prima2/atlas platforms are getting removed, so this driver
is no longer needed.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NBarry Song <baohua@kernel.org>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The smp8758 (tango4) SoC was the last generation of set-top-box chips
to come out of Sigma Designs, and support was added by Marc Gonzalez
and Måns Rullgård between 2015 and 2017, before the company went out of
business and the products were abandoned.

The chip is used in some set-top-boxes such as the Popcorn Hour A-500,
which could have seen some adoption by hobbyists. This has not happened
in the past four years, and support for the more widely used MIPS based
SoCs was never merged at all.

Thanks to Marc and Måns for maintaining for the past years even after the
death of the platform.

Cc: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Mans Rullgard <mans@mansr.com>
Link: https://lore.kernel.org/lkml/2d643ebc-09af-a809-eb3f-2aec8ecee501@free.fr/Signed-off-by: NArnd Bergmann <arnd@arndb.de>

Support for this machine was just removed, so drop the now unused i2c
bus driver, too.
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The patch supports slave mode for imx I2C driver
Signed-off-by: NBiwen Li <biwen.li@nxp.com>
Acked-by: NOleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

If this is not enabled, the interfaces used in this driver do not work:

drivers/i2c/busses/i2c-mlxbf.c:1888:3: error: implicit declaration of function 'i2c_slave_event' [-Werror,-Wimplicit-function-declaration]
                i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
                ^
drivers/i2c/busses/i2c-mlxbf.c:1888:26: error: use of undeclared identifier 'I2C_SLAVE_WRITE_REQUESTED'
                i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
                                       ^
drivers/i2c/busses/i2c-mlxbf.c:1890:32: error: use of undeclared identifier 'I2C_SLAVE_WRITE_RECEIVED'
                ret = i2c_slave_event(slave, I2C_SLAVE_WRITE_RECEIVED,
                                             ^
drivers/i2c/busses/i2c-mlxbf.c:1892:26: error: use of undeclared identifier 'I2C_SLAVE_STOP'
                i2c_slave_event(slave, I2C_SLAVE_STOP, &value);
                                       ^

Fixes: b5b5b320 ("i2c: mlxbf: I2C SMBus driver for Mellanox BlueField SoC")
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NKhalil Blaiech <kblaiech@nvidia.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The Mellanox BlueField I2C controller is only present on Mellanox
BlueField SoCs.  Hence add a dependency on MELLANOX_PLATFORM, to prevent
asking the user about this driver when configuring a kernel without
Mellanox platform support.

Fixes: b5b5b320 ("i2c: mlxbf: I2C SMBus driver for Mellanox BlueField SoC")
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Add PCI ID of SMBus controller on Intel Alder Lake PCH-S
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Add BlueField I2C driver to offer master and slave support for
Mellanox BlueField SoCs. The driver implements an SMBus adapter
and interfaces to multiple busses that can be probed using both
ACPI and Device Tree infrastructures.

The driver supports several SMBus operations to transfer data
back and forth from/to various I2C devices. It is mainly intended
to be consumed by userspace tools and utilities, such as i2c-tools
and decode-dimms to collect memory module information.

On the other hand, the driver has a slave function to support,
among others, an IPMB interface that requires both master and
slave functions to handle transfers between the BlueField SoC
and a board management controllers (e.g., BMC).
Signed-off-by: NKhalil Blaiech <kblaiech@mellanox.com>
Reviewed-by: NVadim Pasternak <vadimp@mellanox.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The I2C core can now utilize a slave interface to handle SMBus
HostNotify events. Enable it in this driver.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Rely on the core functions to implement the host-notify
protocol via the a I2C slave device.
Signed-off-by: NAlain Volmat <alain.volmat@st.com>
Reviewed-by: NPierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The i2c-rcar driver utilizes the Generic Reset Controller kernel
feature, so select the RESET_CONTROLLER option when the I2C_RCAR
option is selected with a Gen3 SoC.

Fixes: 2b16fd63 ("i2c: rcar: handle RXDMA HW behaviour on Gen3")
Signed-off-by: NDirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: NAndy Lowe <andy_lowe@mentor.com>
[erosca: Add "if ARCH_RCAR_GEN3" per Wolfram's request]
Signed-off-by: NEugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The default value for a config option defaults to 'n' so it doesn't need
to be set here.
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
[jdelvare: found another one]
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Add support for SMBus controller on Intel Emmitsburg PCH. This is the
same IP as used in Cannon Lake and derivatives.
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The unicore32 port is removed from the kernel.
There is no point to keep stale i2c bus driver for this architecture.
Signed-off-by: NMike Rapoport <rppt@linux.ibm.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NGuenter Roeck <linux@roeck-us.net>

Add Nuvoton NPCM BMC I2C controller driver.
Signed-off-by: NTali Perry <tali.perry1@gmail.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Baikal-T1 System Controller is equipped with a dedicated I2C Controller
which functionality is based on the DW APB I2C IP-core, the only
difference in a way it' registers are accessed. There are three access
register provided in the System Controller registers map, which indirectly
address the normal DW APB I2C registers space. So in order to have the
Baikal-T1 System I2C Controller supported by the common DW APB I2C driver
we created a dedicated Dw I2C controller model quirk, which retrieves the
syscon regmap from the parental dt node and creates a new regmap based on
it.
Signed-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Seeing the DW I2C driver is using flags-based accessors with two
conditional clauses it would be better to replace them with the regmap
API IO methods and to initialize the regmap object with read/write
callbacks specific to the controller registers map implementation. This
will be also handy for the drivers with non-standard registers mapping
(like an embedded into the Baikal-T1 System Controller DW I2C block, which
glue-driver is a part of this series).

As before the driver tries to detect the mapping setup at probe stage and
creates a regmap object accordingly, which will be used by the rest of the
code to correctly access the controller registers. In two places it was
appropriate to convert the hand-written read-modify-write and
read-poll-loop design patterns to the corresponding regmap API
ready-to-use methods.

Note the regmap IO methods return value is checked only at the probe
stage. The rest of the code won't do this because basically we have
MMIO-based regmap so non of the read/write methods can fail (this also
won't be needed for the Baikal-T1-specific I2C controller).
Suggested-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Tested-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Acked-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
[wsa: fix type of 'rx_valid' and remove outdated kdoc var description]
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Currently Intel Baytrail I2C semaphore is a feature of the DW APB I2C
platform driver. It's a bit confusing to see it's config in the menu at
some separated place with no reference to the platform code. Let's move the
config definition to be below the I2C_DESIGNWARE_PLATFORM config and mark
it with "depends on I2C_DESIGNWARE_PLATFORM" statement. By doing so the
config menu will display the feature right below the DW I2C platform
driver item and will indent it to the right so signifying its belonging.
Signed-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

DW APB I2C slave code in fact depends on the DW I2C driver core, but not
on the platform code as it used to be before commit 90bc1ee6de9f ("i2c:
designware: Allow slave mode for PCI enumerated devices"). Yes, the I2C
slave interface is currently supported by both the platform and PCI
versions of the IP core, but it still depends on the DW I2C core
functionality and must be available only if the last one is enabled.
So make sure the DW APB I2C slave config is only available if the
I2C_DESIGNWARE_CORE config is enabled.
Signed-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Acked-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

Allow slave mode for PCI enumerated devices by calling a common i2c_dw_probe()
instead of i2c_dw_probe_master().

While dropping dependency to platform driver in slave module, move its
configuration section above, closer to core.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

The BCM2711, supported by ARCH_BCM2835, also has a controller by the
brcmstb driver so let's allow it to be compiled on that platform.
Acked-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NMaxime Ripard <maxime@cerno.tech>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

This commit adds I2C bus support for the Camera Control Interface
(CCI) I2C controller found on the Qualcomm SoC processors. This I2C
controller supports two masters and they are registered to the core.

CCI versions supported in the driver are msm8916, msm8996 and sdm845.

This is a rework of the patch posted by Vinod:
https://patchwork.kernel.org/patch/10569961/

With additional fixes + most of the comments addressed.
Signed-off-by: NTodor Tomov <todor.tomov@linaro.org>
Signed-off-by: NVinod Koul <vkoul@kernel.org>
Signed-off-by: NLoic Poulain <loic.poulain@linaro.org>
Tested-by: NRobert Foss <robert.foss@linaro.org>
Reviewed-by: NBjorn Andersson <bjorn.andersson@linaro.org>
[wsa: removed err msg after platform_get_irq]
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Update the help text to reflect current support devices:
1. The Exynos high speed I2C driver supports Exynos5 (ARMv7), Exynos5433
   and Exynos7 (both ARMv8) SoCs,
2. The S3C I2C driver supports S3C, S5Pv210 and Exynos{3,4,5} SoCs.
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Some of the I2C bus drivers can be compile tested to increase build
coverage.  This requires also:
1. Adding dependencies on COMMON_CLK for BCM2835 and Meson I2C
   controllers,
2. Adding 'if' conditional to 'default y' so they will not get enabled
   by default on all other architectures,
3. Limiting few compile test options to supported architectures (which
   provide the readsX()/writesX() primitives).
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>
[wsa: revert chunk for ZX2967. it needs more preparation]
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

The driver is not 'new' anymore, so remove details from the driver it
surpassed.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

The justification of a light version of the parport driver was less
overhead for embedded systems. Well, today, even if an embedded system
still has a parport, it surely can handle the fully-fledged parport
driver. Remove it to reduce the maintenance burden.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Adjust indentation from spaces to tab (+optional two spaces) as in
coding style with command like:
	$ sed -e 's/^        /\t/' -i */Kconfig
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>
Acked-by: NPeter Rosin <peda@axentia.se>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

There is no suffix applied to Intel Jasper Lake SOC. Remove it
from the comments and definitions. Besides that, it's a SOC,
thus replace PCH with SOC where it appropriate.

Fixes: e0c61c04 ("i2c: i801: Add support for Intel Jasper Lake")
Cc: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-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 i2c subsystem was enhanced circa 2015 to support operating as
an i2c-slave device.  Prior to that, the i2c-pxa driver supported
an i2c-slave but had its own APIs.  There are no existing in-kernel
drivers or platforms that utilize the i2c-pxa APIs.

Migrate the i2c-pxa driver to the general i2c-slave APIs so that
existing drivers, such as the i2c-slave-eeprom, can be used.

This has been tested with a Marvell EspressoBin, using i2c-pxa and
i2c-slave-eeprom, acting as a slave, and a RaspeberryPi 3, using the
at24 driver, acting as a master.
Signed-off-by: NPatrick Williams <alpawi@amazon.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Add support for SMBus controller on Intel Jasper Lake PCH-N.
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>