imx7 uart clock management

[vsiles]

Hi !

In order to run a secure OS along side linux, I'd Linux to stop disabling the clock for UART (at the moment, CCM is still accessible from Linux in the normal world. At some point this will be removed but we are in the early phases of this project).

In order to achieve that, I removed all the clk_disable_unprepare and all the clk_unprepare from drivers/tty/serial/imx.c, but I still end up having UART's TARGET_ROOT value set to 0 sometimes.

Is there another part of the Linux code where uart's clock are disabled ?

Best,

V.

[vsiles · Accepted solution]

In the end, the clocks are fine, it is the whole module that is disabled by Linux. I need to prevent that.