Hi Peter,
> > 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: Ajay Gupta
> > Reviewed-by: Andy Shevchenko
> > Reviewed-by: Heikki Krogerus
> > ---
> > Changes from v1 -> v2
> > None
> > Changes from v2 -> v3
> > Fixed review comments from Andy and Thierry
> > Rename i2c-gpu.c -> i2c-nvidia-gpu.c
> > Changes from v3 -> v4
> > Fixed review comments from Andy
> > Changes from v4 -> v5
> > Fixed review comments from Andy
> > Changes from v5 -> v6
> > None
> > Changes from v6 -> v7 -> v8
> > Fixed review comments from Peter
> > - Add implicit STOP for last write message
> > - Add i2c_adapter_quirks with max_read_len and
> > I2C_AQ_COMB flags
> >
> > Documentation/i2c/busses/i2c-nvidia-gpu | 18 ++
> > MAINTAINERS | 7 +
> > drivers/i2c/busses/Kconfig | 9 +
> > drivers/i2c/busses/Makefile | 1 +
> > drivers/i2c/busses/i2c-nvidia-gpu.c | 400
>
> > 5 files changed, 435 insertions(+)
> > create mode 100644 Documentation/i2c/busses/i2c-nvidia-gpu
> > create mode 100644 drivers/i2c/busses/i2c-nvidia-gpu.c
> >
> > diff --git a/Documentation/i2c/busses/i2c-nvidia-gpu
> > b/Documentation/i2c/busses/i2c-nvidia-gpu
> > new file mode 100644
> > index 000..31884d2
> > --- /dev/null
> > +++ b/Documentation/i2c/busses/i2c-nvidia-gpu
> > @@ -0,0 +1,18 @@
> > +Kernel driver i2c-nvidia-gpu
> > +
> > +Datasheet: not publicly available.
> > +
> > +Authors:
> > + Ajay Gupta
> > +
> > +Description
> > +---
> > +
> > +i2c-nvidia-gpu is a driver for I2C controller included in NVIDIA
> > +Turing and later GPUs and it is used to communicate with Type-C controller
> on GPUs.
> > +
> > +If your 'lspci -v' listing shows something like the following,
> > +
> > +01:00.3 Serial bus controller [0c80]: NVIDIA Corporation Device 1ad9
> > +(rev a1)
> > +
> > +then this driver should support the I2C controller of your GPU.
> > diff --git a/MAINTAINERS b/MAINTAINERS index 9ad052a..2d1c5a1 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -6797,6 +6797,13 @@ L: linux-a...@vger.kernel.org
> > S: Maintained
> > F: drivers/i2c/i2c-core-acpi.c
> >
> > +I2C CONTROLLER DRIVER FOR NVIDIA GPU
> > +M: Ajay Gupta
> > +L: linux-...@vger.kernel.org
> > +S: Maintained
> > +F: Documentation/i2c/busses/i2c-nvidia-gpu
> > +F: drivers/i2c/busses/i2c-nvidia-gpu.c
> > +
> > I2C MUXES
> > M: Peter Rosin
> > L: linux-...@vger.kernel.org
> > diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> > index 451d4ae..eed827b 100644
> > --- a/drivers/i2c/busses/Kconfig
> > +++ b/drivers/i2c/busses/Kconfig
> > @@ -224,6 +224,15 @@ config I2C_NFORCE2_S4985
> > This driver can also be built as a module. If so, the module
> > will be called i2c-nforce2-s4985.
> >
> > +config I2C_NVIDIA_GPU
> > + tristate "NVIDIA GPU I2C controller"
> > + depends on PCI
> > + help
> > + If you say yes to this option, support will be included for the
> > + NVIDIA GPU I2C controller which is used to communicate with the
> GPU's
> > + Type-C controller. This driver can also be built as a module called
> > + i2c-nvidia-gpu.
> > +
> > config I2C_SIS5595
> > tristate "SiS 5595"
> > depends on PCI
> > diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> > index 18b26af..d499813 100644
> > --- a/drivers/i2c/busses/Makefile
> > +++ b/drivers/i2c/busses/Makefile
> > @@ -140,5 +140,6 @@ obj-$(CONFIG_I2C_SIBYTE)+= i2c-sibyte.o
> > obj-$(CONFIG_I2C_XGENE_SLIMPRO) += i2c-xgene-slimpro.o
> > obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
> > obj-$(CONFIG_I2C_FSI) += i2c-fsi.o
> > +obj-$(CONFIG_I2C_NVIDIA_GPU) += i2c-nvidia-gpu.o
> >
> > ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG diff --git
> > a/drivers/i2c/busses/i2c-nvidia-gpu.c
> > b/drivers/i2c/busses/i2c-nvidia-gpu.c
> > new file mode 100644
> > index 000..4816a31
> > --- /dev/null
> > +++ b/drivers/i2c/busses/i2c-nvidia-gpu.c
> > @@ -0,0 +1,400 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Nvidia GPU I2C controller Driver
> > + *
> > + * Copyright (C) 2018 NVIDIA Corporation. All rights reserved.
> > + * Author: Ajay Gupta */ #include
> > +#include #include #include
> > + #include #include
> > + #include #include
> > +
> > +
> > +#include
> > +
> > +/* I2C definitions */
> > +#define I2C_MST_CNTL 0x00
> > +#define I2C_MST_CNTL_GEN_START BIT(0)
> > +#define I2C_MST_CNTL_GEN_STOP BIT(1)
> > +#define I2C_MST_CNTL_CMD_NONE (0 << 2)
> > +#define I2C_MST_CNTL_CMD_READ (1 << 2)
> > +#define I2C_MST_CNTL_CMD_WRITE
