Re: [PATCH v7 04/10] mfd: nct6694: Rename driver to nct6694-usb and update Kconfig

[Lee Jones]

On Fri, 21 Aug 2026, a0282524688@xxxxxxxxx wrote:

> From: Ming Yu <a0282524688@xxxxxxxxx>
> 
> Rename nct6694.c to nct6694-usb.c to accurately reflect that it
> implements the USB transport backend.
> 
> Additionally, introduce a new MFD_NCT6694_USB Kconfig option and convert
> the existing MFD_NCT6694 into a hidden core symbol. The core symbol is
> now automatically selected by the transport drivers.
> 
> This Kconfig and naming restructure aligns with standard MFD transport
> abstraction practices, paving the way for future interfaces (e.g., HIF)
> to be seamlessly integrated.
> 
> Signed-off-by: Ming Yu <a0282524688@xxxxxxxxx>
> ---
> Changes in v7:

No changes or you forgot to populate it?

> Changes in v6:

> - Split from the monolithic v4 patch to follow the single logical change
>   principle.
> 
>  MAINTAINERS                              |  2 +-
>  drivers/mfd/Kconfig                      | 31 ++++++++++++++++--------
>  drivers/mfd/Makefile                     |  2 +-
>  drivers/mfd/{nct6694.c => nct6694-usb.c} |  0
>  4 files changed, 23 insertions(+), 12 deletions(-)
>  rename drivers/mfd/{nct6694.c => nct6694-usb.c} (100%)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 040df7bfb24f..89d7339f3613 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19356,7 +19356,7 @@ S:	Supported
>  F:	drivers/gpio/gpio-nct6694.c
>  F:	drivers/hwmon/nct6694-hwmon.c
>  F:	drivers/i2c/busses/i2c-nct6694.c
> -F:	drivers/mfd/nct6694.c
> +F:	drivers/mfd/nct6694-usb.c
>  F:	drivers/net/can/usb/nct6694_canfd.c
>  F:	drivers/rtc/rtc-nct6694.c
>  F:	drivers/watchdog/nct6694_wdt.c
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 763ce6a34782..5506a0adf3ec 100644
> --- "a/drivers/mfd/Kconfig"
> +++ "b/drivers/mfd/Kconfig"
> @@ -1164,19 +1164,30 @@ config MFD_MENF21BMC
>  	  will be called menf21bmc.
>  
>  config MFD_NCT6694

So what does this do now?

Will there be another core symbol soon?

> -	tristate "Nuvoton NCT6694 support"
> +	tristate
>  	select MFD_CORE
> +	help
> +	  Core MFD support for the Nuvoton NCT6694 peripheral expander.
> +	  This provides the common APIs and shared structures used by all
> +	  interfaces (USB, HIF) to access the NCT6694 hardware features
> +	  such as GPIO, I2C, CAN-FD, Watchdog, ADC, PWM, and RTC.
> +
> +	  It is selected automatically by the transport interface drivers.
> +
> +config MFD_NCT6694_USB
> +	tristate "Nuvoton NCT6694 USB interface support"
> +	select MFD_NCT6694
>  	depends on USB
>  	help
> -	  This enables support for the Nuvoton USB device NCT6694, which shares
> -	  peripherals.
> -	  The Nuvoton NCT6694 is a peripheral expander with 16 GPIO chips,
> -	  6 I2C controllers, 2 CANfd controllers, 2 Watchdog timers, ADC,
> -	  PWM, and RTC.
> -	  This driver provides core APIs to access the NCT6694 hardware
> -	  monitoring and control features.
> -	  Additional drivers must be enabled to utilize the specific
> -	  functionalities of the device.
> +	  This enables support for the Nuvoton NCT6694 peripheral expander
> +	  connected via the USB interface.
> +
> +	  The transport driver uses USB bulk and interrupt transfers to
> +	  communicate with the NCT6694 firmware. Enable this option if you
> +	  are using the NCT6694 via a USB connection.
> +
> +	  To compile this driver as a module, choose M here: the module
> +	  will be called nct6694-usb.
>  
>  config MFD_OCELOT
>  	tristate "Microsemi Ocelot External Control Support"
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index dd4bb7e77c33..48caac64f3d8 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -124,7 +124,7 @@ obj-$(CONFIG_MFD_MC13XXX_I2C)	+= mc13xxx-i2c.o
>  
>  obj-$(CONFIG_MFD_PF1550)	+= pf1550.o
>  
> -obj-$(CONFIG_MFD_NCT6694)	+= nct6694.o
> +obj-$(CONFIG_MFD_NCT6694_USB)	+= nct6694-usb.o
>  
>  obj-$(CONFIG_MFD_CORE)		+= mfd-core.o
>  
> diff --git a/drivers/mfd/nct6694.c b/drivers/mfd/nct6694-usb.c
> similarity index 100%
> rename from drivers/mfd/nct6694.c
> rename to drivers/mfd/nct6694-usb.c
> -- 
> 2.34.1
> 

-- 
Lee Jones