Re: [PATCH] ARM: sti: stih410-clocks: Add PROC_STFE as a critical clock

Lee Jones
2016-10-26T08:49:12Z

> > > If the clock is enabled when Linux boots, the Linux clock framework *needs*
> > > to assume the hardware may have been used in previous boot stages, and it should
> > > not attempt to disable the clock.
> >
> > None of the boot loaders we use do this.
>
> But the Linux kernel isn't just used by us. It is not uncommon for STB
> bootloaders to get information from the frontend as part of the boot process.

Okay, this is the clincher. Since we need to support non-standard
bootloaders, it's difficult to guarantee that the clock will be
disabled at boot. For this reason, I believe that we can call this a
critical clock.

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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