Tegra HSP (Hardware Synchronization Primitives) Driver

modulename: tegra-hsp.ko

configname: CONFIG_TEGRA_HSP_MBOX

Linux Kernel Configuration
└─>Device Drivers
└─>Mailbox Hardware Support
└─>Tegra HSP (Hardware Synchronization Primitives) Driver
In linux kernel since version 4.1 (release Date: 2015-06-21)  
The Tegra HSP driver is used for the interprocessor communication
between different remote processors and host processors on Tegra186
and later SoCs. Say Y here if you want to have this support.
If unsure say N.

source code: