i2c: spacemit: add support for SpacemiT K1 SoC

This patch introduces basic I2C support for the SpacemiT K1 SoC,
utilizing interrupts for transfers.

The driver has been tested using i2c-tools on a B

i2c: spacemit: add support for SpacemiT K1 SoC

This patch introduces basic I2C support for the SpacemiT K1 SoC,
utilizing interrupts for transfers.

The driver has been tested using i2c-tools on a Bananapi-F3 board,
and basic I2C read/write operations have been confirmed to work.

Signed-off-by: Troy Mitchell <[email protected]>
Reviewed-by: Alex Elder <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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i2c: Add driver for the RTL9300 I2C controller

Add support for the I2C controller on the RTL9300 SoC. There are two I2C
controllers in the RTL9300 that are part of the Ethernet switch register
block

i2c: Add driver for the RTL9300 I2C controller

Add support for the I2C controller on the RTL9300 SoC. There are two I2C
controllers in the RTL9300 that are part of the Ethernet switch register
block. Each of these controllers owns a SCL pin (GPIO8 for the fiorst
I2C controller, GPIO17 for the second). There are 8 possible SDA pins
(GPIO9-16) that can be assigned to either I2C controller. This
relationship is represented in the device tree with a child node for
each SDA line in use.

This is based on the openwrt implementation[1] but has been
significantly modified

[1] - https://git.openwrt.org/?p=openwrt/openwrt.git;a=blob;f=target/linux/realtek/files-5.15/drivers/i2c/busses/i2c-rtl9300.c

Signed-off-by: Chris Packham <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>

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i2c: busses: Use *-y instead of *-objs in Makefile

*-objs suffix is reserved rather for (user-space) host programs while
usually *-y suffix is used for kernel drivers (although *-objs works
for that

i2c: busses: Use *-y instead of *-objs in Makefile

*-objs suffix is reserved rather for (user-space) host programs while
usually *-y suffix is used for kernel drivers (although *-objs works
for that purpose for now).

Let's correct the old usages of *-objs in Makefiles.

While at it, fix an obvious typo in help section of the Kconfig.

Signed-off-by: Andy Shevchenko <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>

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i2c: Drop legacy muxing pseudo-drivers

The i2c-amd756-s4882 and i2c-nforce2-s4985 muxing pseudo-drivers were
written at a time when the i2c core did not support muxing. They are
essentially board-sp

i2c: Drop legacy muxing pseudo-drivers

The i2c-amd756-s4882 and i2c-nforce2-s4985 muxing pseudo-drivers were
written at a time when the i2c core did not support muxing. They are
essentially board-specific hacks. If we had to add support for these
boards today, we would implement it in a completely different way.

These Tyan server boards are 19 years old by now, so I very much doubt
any of these is still running today. So let's just drop this clumsy
code. If anyone really still needs this support and complains, I'll
rewrite it in a proper way on top of i2c-mux.

This also fixes the following warnings:
drivers/i2c/busses/i2c-amd756.c:286:20: warning: symbol 'amd756_smbus' was not declared. Should it be static?
drivers/i2c/busses/i2c-nforce2.c:123:20: warning: symbol 'nforce2_smbus' was not declared. Should it be static?

Signed-off-by: Jean Delvare <[email protected]>
Cc: Andi Shyti <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>

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i2c: amd-asf: Add ACPI support for AMD ASF Controller

The AMD ASF controller is presented to the operating system as an ACPI
device. The AMD ASF driver can use ACPI to obtain information about the
A

i2c: amd-asf: Add ACPI support for AMD ASF Controller

The AMD ASF controller is presented to the operating system as an ACPI
device. The AMD ASF driver can use ACPI to obtain information about the
ASF controller's attributes, such as the ASF address space and interrupt
number, and to handle ASF interrupts.

Currently, the piix4 driver assumes that a specific port address is
designated for AUX operations. However, with the introduction of ASF, the
same port address may also be used by the ASF controller. Therefore, a
check needs to be added to ensure that if ASF is advertised and enabled in
ACPI, the AUX port should not be configured.

Reviewed-by: Andy Shevchenko <[email protected]>
Co-developed-by: Sanket Goswami <[email protected]>
Signed-off-by: Sanket Goswami <[email protected]>
Signed-off-by: Shyam Sundar S K <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>

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i2c: Congatec Board Controller i2c bus driver

Add i2c support for the Congatec Board Controller.

The Board Controller has two i2c busses, a General Purpose bus and a Power
Management bus.

Acked-by

i2c: Congatec Board Controller i2c bus driver

Add i2c support for the Congatec Board Controller.

The Board Controller has two i2c busses, a General Purpose bus and a Power
Management bus.

Acked-by: Andi Shyti <[email protected]>
Signed-off-by: Thomas Richard <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

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i2c: keba: Add KEBA I2C controller support

The KEBA I2C controller is found in the system FPGA of KEBA PLC devices.
It is used to connect EEPROMs and hardware monitoring chips. The

It is a simple I

i2c: keba: Add KEBA I2C controller support

The KEBA I2C controller is found in the system FPGA of KEBA PLC devices.
It is used to connect EEPROMs and hardware monitoring chips. The

It is a simple I2C controller with a fixed bus speed of 100 kbit/s. The
whole message transmission is executed by the driver. The driver
triggers all steps over control, status and data register. There are no
FIFOs or interrupts.

Signed-off-by: Gerhard Engleder <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>

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i2c: viai2c: turn common code into a proper module

The i2c-viai2c-common.c file is used by two drivers, but is not a proper
abstraction and can get linked into both modules in the same configuration

i2c: viai2c: turn common code into a proper module

The i2c-viai2c-common.c file is used by two drivers, but is not a proper
abstraction and can get linked into both modules in the same configuration,
which results in a warning:

scripts/Makefile.build:236: drivers/i2c/busses/Makefile: i2c-viai2c-common.o is added to multiple modules: i2c-wmt i2c-zhaoxin

The other problems with this include the incorrect use of a __weak function
when both are built-in, and the fact that the "common" module is sprinked
with 'if (i2c->plat == ...)' checks that have knowledge about the differences
between the drivers using it.

Avoid the link time warning by making the common driver a proper module
with MODULE_LICENCE()/MODULE_AUTHOR() tags, and remove the __weak function
by slightly rearranging the code.

This adds a little more duplication between the two main drivers, but
those versions get more readable in the process.

Fixes: a06b80e83011 ("i2c: add zhaoxin i2c controller driver")
Signed-off-by: Arnd Bergmann <[email protected]>
Tested-by: Hans Hu <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>

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i2c: add zhaoxin i2c controller driver

Add Zhaoxin I2C controller driver. It provides the access to the i2c
busses, which connects to the touchpad, eeprom, I2S, etc.

Zhaoxin I2C controller has two

i2c: add zhaoxin i2c controller driver

Add Zhaoxin I2C controller driver. It provides the access to the i2c
busses, which connects to the touchpad, eeprom, I2S, etc.

Zhaoxin I2C controller has two separate busses, so may accommodate up
to two I2C adapters. Those adapters are listed in the ACPI namespace
with the IIC1D17 HID, and probed by a platform driver.

The driver works with IRQ mode, and supports basic I2C features. Flags
I2C_AQ_NO_ZERO_LEN and I2C_AQ_COMB_WRITE_THEN_READ are used to limit
the unsupported access.

Acked-by: Wolfram Sang <[email protected]>
Signed-off-by: Hans Hu <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>

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i2c: wmt: split out common files

Since the I2C IP of both wmt and zhaoxin originates from VIA,
it is better to separate the common code first.
The common driver is named as i2c-viai2c-common.c.
Old

i2c: wmt: split out common files

Since the I2C IP of both wmt and zhaoxin originates from VIA,
it is better to separate the common code first.
The common driver is named as i2c-viai2c-common.c.
Old i2c-wmt.c renamed to i2c-viai2c-wmt.c.

The MAINTAINERS file will be updated accordingly in upcoming commits.

Reviewed-by: Wolfram Sang <[email protected]>
Signed-off-by: Hans Hu <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>

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i2c: pasemi: split driver into two separate modules

On powerpc, it is possible to compile test both the new apple (arm) and
old pasemi (powerpc) drivers for the i2c hardware at the same time,
which

i2c: pasemi: split driver into two separate modules

On powerpc, it is possible to compile test both the new apple (arm) and
old pasemi (powerpc) drivers for the i2c hardware at the same time,
which leads to a warning about linking the same object file twice:

scripts/Makefile.build:244: drivers/i2c/busses/Makefile: i2c-pasemi-core.o is added to multiple modules: i2c-apple i2c-pasemi

Rework the driver to have an explicit helper module, letting Kbuild
take care of whether this should be built-in or a loadable driver.

Fixes: 9bc5f4f660ff ("i2c: pasemi: Split pci driver to its own file")
Signed-off-by: Arnd Bergmann <[email protected]>
Reviewed-by: Sven Peter <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>

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i2c: Add support for Intel LJCA USB I2C driver

Implements the I2C function of Intel USB-I2C/GPIO/SPI adapter device
named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA I2C
module with spe

i2c: Add support for Intel LJCA USB I2C driver

Implements the I2C function of Intel USB-I2C/GPIO/SPI adapter device
named "La Jolla Cove Adapter" (LJCA). It communicate with LJCA I2C
module with specific protocol through interfaces exported by LJCA
USB driver.

Signed-off-by: Wentong Wu <[email protected]>
Reviewed-by: Sakari Ailus <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Tested-by: Hans de Goede <[email protected]>
Reviewed-by: Wolfram Sang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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i2c: Add GXP SoC I2C Controller

The GXP SoC supports 10 I2C engines. Each I2C engine is completely
independent and can function both as an I2C master and I2C slave. The
I2C master can operate in a m

i2c: Add GXP SoC I2C Controller

The GXP SoC supports 10 I2C engines. Each I2C engine is completely
independent and can function both as an I2C master and I2C slave. The
I2C master can operate in a multi master environment. The engines support
a scalable speed from 8kHZ to 1.5 Mhz.

Signed-off-by: Nick Hawkins <[email protected]>
Reviewed-by: Joel Stanley <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: ls2x: Add driver for Loongson-2K/LS7A I2C controller

This I2C module is integrated into the Loongson-2K SoCs and Loongson
LS7A bridge chip.

Signed-off-by: Binbin Zhou <[email protected]>

i2c: ls2x: Add driver for Loongson-2K/LS7A I2C controller

This I2C module is integrated into the Loongson-2K SoCs and Loongson
LS7A bridge chip.

Signed-off-by: Binbin Zhou <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: microchip: pci1xxxx: Add driver for I2C host controller in multifunction endpoint of pci1xxxx switch

Microchip pci1xxxx is an unmanaged PCIe3.1a Switch for Consumer,
Industrial and Automotive a

i2c: microchip: pci1xxxx: Add driver for I2C host controller in multifunction endpoint of pci1xxxx switch

Microchip pci1xxxx is an unmanaged PCIe3.1a Switch for Consumer,
Industrial and Automotive applications. This switch has multiple
downstream ports. In one of the Switch's Downstream port, there
is a multifunction endpoint for peripherals which includes an I2C
host controller. The I2C function in the endpoint operates at 100KHz,
400KHz and 1 MHz and has buffer depth of 128 bytes.
This patch provides the I2C controller driver for the I2C function
of the switch.

Signed-off-by: Tharun Kumar P <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: Add Renesas RZ/V2M controller

Yet another i2c controller from Renesas that is found on the RZ/V2M
(r9a09g011) SoC. It can support only 100kHz and 400KHz operation.

Signed-off-by: Phil Edworthy

i2c: Add Renesas RZ/V2M controller

Yet another i2c controller from Renesas that is found on the RZ/V2M
(r9a09g011) SoC. It can support only 100kHz and 400KHz operation.

Signed-off-by: Phil Edworthy <[email protected]>
Reviewed-by: Biju Das <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Philipp Zabel <[email protected]>
[wsa: removed superfluous class type and renamed a function]
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: add support for microchip fpga i2c controllers

Add Microchip CoreI2C i2c controller support. This driver supports the
"hard" i2c controller on the Microchip PolarFire SoC & the basic feature
se

i2c: add support for microchip fpga i2c controllers

Add Microchip CoreI2C i2c controller support. This driver supports the
"hard" i2c controller on the Microchip PolarFire SoC & the basic feature
set for "soft" i2c controller implemtations in the FPGA fabric.

Co-developed-by: Daire McNamara <[email protected]>
Signed-off-by: Daire McNamara <[email protected]>
Signed-off-by: Conor Dooley <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: npcm: Support NPCM845

Add NPCM8XX I2C support.
The NPCM8XX uses a similar i2c module as NPCM7XX.
The internal HW FIFO is larger in NPCM8XX.

Signed-off-by: Tyrone Ting <[email protected]>
Acke

i2c: npcm: Support NPCM845

Add NPCM8XX I2C support.
The NPCM8XX uses a similar i2c module as NPCM7XX.
The internal HW FIFO is larger in NPCM8XX.

Signed-off-by: Tyrone Ting <[email protected]>
Acked-by: Tomer Maimon <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: Introduce common module to instantiate CCGx UCSI

Introduce a common module to provide an API to instantiate UCSI device
for Cypress CCGx Type-C controller. Individual bus drivers need to select

i2c: Introduce common module to instantiate CCGx UCSI

Introduce a common module to provide an API to instantiate UCSI device
for Cypress CCGx Type-C controller. Individual bus drivers need to select
this one on demand.

Signed-off-by: Andy Shevchenko <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: designware: Add AMD PSP I2C bus support

Implement an I2C controller sharing mechanism between the host (kernel)
and PSP co-processor on some platforms equipped with AMD Cezanne SoC.

On these p

i2c: designware: Add AMD PSP I2C bus support

Implement an I2C controller sharing mechanism between the host (kernel)
and PSP co-processor on some platforms equipped with AMD Cezanne SoC.

On these platforms we need to implement "software" i2c arbitration.
Default arbitration owner is PSP and kernel asks for acquire as well
as inform about release of the i2c bus via mailbox mechanism.

+---------+
<- ACQUIRE | |
+---------| CPU |\
| | | \ +----------+ SDA
| +---------+ \ | |-------
MAILBOX +--> | I2C-DW | SCL
| +---------+ | |-------
| | | +----------+
+---------| PSP |
<- ACK | |
+---------+

+---------+
<- RELEASE | |
+---------| CPU |
| | | +----------+ SDA
| +---------+ | |-------
MAILBOX +--> | I2C-DW | SCL
| +---------+ / | |-------
| | | / +----------+
+---------| PSP |/
<- ACK | |
+---------+

The solution is similar to i2c-designware-baytrail.c implementation, where
we are using a generic i2c-designware-* driver with a small "wrapper".

In contrary to baytrail semaphore implementation, beside internal
acquire_lock() and release_lock() methods we are also applying quirks to
lock_bus() and unlock_bus() global adapter methods. With this in place
all i2c clients drivers may lock i2c bus for a desired number of i2c
transactions (e.g. write-wait-read) without being aware of that such bus
is shared with another entity.

Modify i2c_dw_probe_lock_support() to select correct semaphore
implementation at runtime, since now we have more than one available.

Configure new matching ACPI ID "AMDI0019" and register
ARBITRATION_SEMAPHORE flag in order to distinguish setup with PSP
arbitration.

Add myself as a reviewer for I2C DesignWare in order to help with reviewing
and testing possible changes touching new i2c-designware-amdpsp.c module.

Signed-off-by: Jan Dabros <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Jarkko Nikula <[email protected]>
Tested-by: Jarkko Nikula <[email protected]>
[wsa: removed unneeded blank line and curly braces]
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: Remove unused Netlogic/Sigma Designs XLR driver

Commits 95b8a5e0111a ("MIPS: Remove NETLOGIC support") and edd4488aea9c
("ARM: remove tango platform") removed Netlogic XLR and Sigma Designs
Tan

i2c: Remove unused Netlogic/Sigma Designs XLR driver

Commits 95b8a5e0111a ("MIPS: Remove NETLOGIC support") and edd4488aea9c
("ARM: remove tango platform") removed Netlogic XLR and Sigma Designs
Tango platforms which means there are no platforms using the XLR I2C
driver and it can be removed.

Signed-off-by: Rob Herring <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: pasemi: Add Apple platform driver

With all the previous preparations we can now finally add
the platform driver to support the PASemi-based controllers
in Apple SoCs. This does not work on the

i2c: pasemi: Add Apple platform driver

With all the previous preparations we can now finally add
the platform driver to support the PASemi-based controllers
in Apple SoCs. This does not work on the M1 yet but should
work on the early iPhones already.

Reviewed-by: Arnd Bergmann <[email protected]>
Signed-off-by: Sven Peter <[email protected]>
Acked-by: Olof Johansson <[email protected]>
Tested-by: Christian Zigotzky <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: pasemi: Split pci driver to its own file

Split off the PCI driver so that we can reuse common code for the
platform driver.

Reviewed-by: Arnd Bergmann <[email protected]>
Signed-off-by: Sven Peter

i2c: pasemi: Split pci driver to its own file

Split off the PCI driver so that we can reuse common code for the
platform driver.

Reviewed-by: Arnd Bergmann <[email protected]>
Signed-off-by: Sven Peter <[email protected]>
Acked-by: Olof Johansson <[email protected]>
Tested-by: Christian Zigotzky <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: virtio: add a virtio i2c frontend driver

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 th

i2c: virtio: add a virtio i2c frontend driver

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: Conghui Chen <[email protected]>
Signed-off-by: Conghui Chen <[email protected]>
Signed-off-by: Jie Deng <[email protected]>
Reviewed-by: Viresh Kumar <[email protected]>
Tested-by: Viresh Kumar <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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i2c: remove dead PMC MSP TWI/SMBus/I2C driver

Commit 1b00767fd8e1 ("MIPS: Remove PMC MSP71xx platform") removes the
config PMC_MSP in ./arch/mips/Kconfig.

Hence, since then, the corresponding PMC M

i2c: remove dead PMC MSP TWI/SMBus/I2C driver

Commit 1b00767fd8e1 ("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: Lukas Bulwahn <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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