ChromeOS Embedded Controller multifunction device

modulename: cros_ec_dev.ko

configname: CONFIG_MFD_CROS_EC_DEV

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>ChromeOS Embedded Controller multifunction device
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Select this to get support for ChromeOS Embedded Controller
sub-devices. This driver will instantiate additional drivers such
as RTC, USBPD, etc. but you have to select the individual drivers.

To compile this driver as a module, choose M here: the module will be
called cros-ec-dev.

source code: