usb: add user selectable option for the whole USB Type-C Support

It is more clear from user perspective to wrap the whole USB
Type-C support under a single option that the user can
select, then it is to always ask the user for every USB
Type-C and USB Power Delivery driver separately.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/Kconfig

@@ -1,13 +1,53 @@
 
-menu "USB Power Delivery and Type-C drivers"
+menuconfig TYPEC
+	tristate "USB Type-C Support"
+	help
+	  USB Type-C Specification defines a cable and connector for USB where
+	  only one type of plug is supported on both ends, i.e. there will not
+	  be Type-A plug on one end of the cable and Type-B plug on the other.
+	  Determination of the host-to-device relationship happens through a
+	  specific Configuration Channel (CC) which goes through the USB Type-C
+	  cable. The Configuration Channel may also be used to detect optional
+	  Accessory Modes - Analog Audio and Debug - and if USB Power Delivery
+	  is supported, the Alternate Modes, where the connector is used for
+	  something else then USB communication.
+
+	  USB Power Delivery Specification defines a protocol that can be used
+	  to negotiate the voltage and current levels with the connected
+	  partners. USB Power Delivery allows higher voltages then the normal
+	  5V, up to 20V, and current up to 5A over the cable. The USB Power
+	  Delivery protocol is also used to negotiate the optional Alternate
+	  Modes when they are supported. USB Power Delivery does not depend on
+	  USB Type-C connector, however it is mostly used together with USB
+	  Type-C connectors.
+
+	  USB Type-C and USB Power Delivery Specifications define a set of state
+	  machines that need to be implemented in either software or firmware.
+	  Simple USB Type-C PHYs, for example USB Type-C Port Controller
+	  Interface Specification compliant "Port Controllers" need the state
+	  machines to be handled in the OS, but stand-alone USB Type-C and Power
+	  Delivery controllers handle the state machines inside their firmware.
+	  The USB Type-C and Power Delivery controllers usually function
+	  autonomously, and do not necessarily require drivers.
+
+	  Enable this configurations option if you have USB Type-C connectors on
+	  your system and 1) you know your USB Type-C hardware requires OS
+	  control (a driver) to function, or 2) if you need to be able to read
+	  the status of the USB Type-C ports in your system, or 3) if you need
+	  to be able to swap the power role (decide are you supplying or
+	  consuming power over the cable) or data role (host or device) when
+	  both roles are supported.
+
+	  For more information, see the kernel documentation for USB Type-C
+	  Connector Class API (Documentation/driver-api/usb/typec.rst)
+	  <https://www.kernel.org/doc/html/latest/driver-api/usb/typec.html>
+	  and ABI (Documentation/ABI/testing/sysfs-class-typec).
 
-config TYPEC
-	tristate
+if TYPEC
 
 config TYPEC_TCPM
 	tristate "USB Type-C Port Controller Manager"
 	depends on USB
-	select TYPEC
 	help
 	  The Type-C Port Controller Manager provides a USB PD and USB Type-C
 	  state machine for use with Type-C Port Controllers.
@@ -22,7 +62,6 @@ config TYPEC_WCOVE
 	depends on INTEL_SOC_PMIC
 	depends on INTEL_PMC_IPC
 	depends on BXT_WC_PMIC_OPREGION
-	select TYPEC
 	help
 	  This driver adds support for USB Type-C detection on Intel Broxton
 	  platforms that have Intel Whiskey Cove PMIC. The driver can detect the
@@ -31,19 +70,18 @@ config TYPEC_WCOVE
 	  To compile this driver as module, choose M here: the module will be
 	  called typec_wcove
 
-endif
+endif # TYPEC_TCPM
 
 source "drivers/usb/typec/ucsi/Kconfig"
 
 config TYPEC_TPS6598X
 	tristate "TI TPS6598x USB Power Delivery controller driver"
 	depends on I2C
-	select TYPEC
 	help
 	  Say Y or M here if your system has TI TPS65982 or TPS65983 USB Power
 	  Delivery controller.
 
 	  If you choose to build this driver as a dynamically linked module, the
 	  module will be called tps6598x.ko.
 
-endmenu
+endif # TYPEC

drivers/usb/typec/ucsi/Kconfig

@@ -1,7 +1,6 @@
 config TYPEC_UCSI
 	tristate "USB Type-C Connector System Software Interface driver"
 	depends on !CPU_BIG_ENDIAN
-	select TYPEC
 	help
 	  USB Type-C Connector System Software Interface (UCSI) is a
 	  specification for an interface that allows the operating system to