cfb93c1c82
r8a779f0 is also know as S4, this SoC is part of the Gen4 SoC series, has 8 Cortex-A55 and a dual core lockstep Cortex-R52 processor. SCIF0 is dedicated to Zephyr and SCIF3 to Linux. **Control Domains** IMPORTANT: This SoC is divided into two "domains": - Application domain contains some peripherals as well as A55 & R52 cores. - Control domain that contain a G4MH/RH850 MCU and other peripherals. In order to access control domain peripherals such as gpio4-7 and CAN-FD from application domain, the G4MH MCU has to unlock a protection mechanism from control domain buses. "Protected" controllers will be flagged in gen4 device trees, warning users that they need to flash a custom G4MH firmware to unlock access to these controllers. **Clock controller** This SoC clock controller is offering "domains" for each world (Zephyr/Linux). These domains are several "entry points" to the clock controller which are arbitrated to avoid a world from turning off a clock needed by another one. We decided to use the same domain as Linux because the security mechanism as to be implemented before accessing another domain. Signed-off-by: Aymeric Aillet <aymeric.aillet@iot.bzh> |
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