usb: typec: bm92txx: add Rohm BM92TXX support

Add a driver for the Rohm Semiconductor BM92TXX family of USB Type-C
and Power Delivery controllers. The IC integrates an MCU that runs the
PD state machine; the host configures it and observes status over I2C
and reacts to a level-triggered ALERT interrupt.

The driver exposes the controller through extcon and a USB role switch,
manages the VBUS sink, optional VBUS source and battery-charger
regulators along with the VCONN-enable GPIO, and applies per-PDO
charging current limits (5 V, 9 V, 12 V, 15 V) sourced from device
tree. DisplayPort alternate-mode handling and dock LED behaviour are
configurable through rohm,* properties so the same driver can serve
boards that wire the part up differently. A debugfs interface under
bm92txx/ is provided for register dumps and low-level command access
when CONFIG_DEBUG_FS is enabled.

Signed-off-by: CTCaer <ctcaer@gmail.com>
Signed-off-by: Alexandre Hamamdjian <azkali.limited@gmail.com>

MAINTAINERS

@@ -23259,6 +23259,13 @@ L:	linux-iio@vger.kernel.org
 S:	Supported
 F:	drivers/iio/pressure/rohm-bm1390.c
 
+ROHM BM92TXX USB TYPE-C CONTROLLER DRIVER
+M:	CTCaer <ctcaer@gmail.com>
+M:	Alexandre Hamamdjian <azkali.limited@gmail.com>
+L:	linux-usb@vger.kernel.org
+S:	Maintained
+F:	drivers/usb/typec/bm92txx.c
+
 ROHM BU270xx LIGHT SENSOR DRIVERs
 M:	Matti Vaittinen <mazziesaccount@gmail.com>
 L:	linux-iio@vger.kernel.org

drivers/usb/typec/Kconfig

@@ -64,6 +64,17 @@ config TYPEC_ANX7411
 	  If you choose to build this driver as a dynamically linked module, the
 	  module will be called anx7411.ko.
 
+config TYPEC_BM92TXX
+	tristate "Rohm Semiconductor BM92TXX USB Type-C Support"
+	depends on I2C
+	depends on USB_ROLE_SWITCH
+	help
+	  Say Y or M here if your system has Rohm BM92TXX USB Type-C and
+	  Power Delivery controller.
+
+	  If you choose to build this driver as a dynamically linked module, the
+	  module will be called bm92txx.ko
+
 config TYPEC_RT1719
 	tristate "Richtek RT1719 Sink Only Type-C controller driver"
 	depends on USB_ROLE_SWITCH || !USB_ROLE_SWITCH

drivers/usb/typec/Makefile

@@ -7,6 +7,7 @@ obj-$(CONFIG_TYPEC_TCPM)	+= tcpm/
 obj-$(CONFIG_TYPEC_UCSI)	+= ucsi/
 obj-$(CONFIG_TYPEC_TPS6598X)	+= tipd/
 obj-$(CONFIG_TYPEC_ANX7411)	+= anx7411.o
+obj-$(CONFIG_TYPEC_BM92TXX)	+= bm92txx.o
 obj-$(CONFIG_TYPEC_HD3SS3220)	+= hd3ss3220.o
 obj-$(CONFIG_TYPEC_STUSB160X) 	+= stusb160x.o
 obj-$(CONFIG_TYPEC_RT1719)	+= rt1719.o