usb: typec: add support for the nb7vpq904m Type-C Linear Redriver

Add support for the ON Semiconductor NB7VPQ904M Type-C USB SuperSpeed
and DisplayPort ALT Mode Linear Redriver chip found on some devices
with a Type-C port.

The redriver compensates ultra High-Speeed DisplayPort and USB
Super Speed signal integrity losses mainly due to PCB & transmission
cables.

The redriver doesn't support SuperSpeed lines swapping, but
can support Type-C SBU lines swapping.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Message-ID: <20230601-topic-sm8x50-upstream-redriver-v4-2-91d5820f3a03@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/mux/Kconfig

@@ -35,4 +35,12 @@ config TYPEC_MUX_INTEL_PMC
 	  control the USB role switch and also the multiplexer/demultiplexer
 	  switches used with USB Type-C Alternate Modes.
 
+config TYPEC_MUX_NB7VPQ904M
+	tristate "On Semiconductor NB7VPQ904M Type-C redriver driver"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Say Y or M if your system has a On Semiconductor NB7VPQ904M Type-C
+	  redriver chip found on some devices with a Type-C port.
+
 endmenu

drivers/usb/typec/mux/Makefile

@@ -4,3 +4,4 @@ obj-$(CONFIG_TYPEC_MUX_FSA4480)		+= fsa4480.o
 obj-$(CONFIG_TYPEC_MUX_GPIO_SBU)	+= gpio-sbu-mux.o
 obj-$(CONFIG_TYPEC_MUX_PI3USB30532)	+= pi3usb30532.o
 obj-$(CONFIG_TYPEC_MUX_INTEL_PMC)	+= intel_pmc_mux.o
+obj-$(CONFIG_TYPEC_MUX_NB7VPQ904M)	+= nb7vpq904m.o