linux-kernel - Re: [PATCH] ARM: sti: stih410-clocks: Add PROC

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Message-ID: <20161026085620.GA5476@griffinp-ThinkPad-X1-Carbon-2nd>
Date:   Wed, 26 Oct 2016 09:56:20 +0100
From:   Peter Griffin <peter.griffin@...aro.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...inux.com, patrice.chotard@...com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] ARM: sti: stih410-clocks: Add PROC_STFE as a critical
 clock

Hi Lee,

On Wed, 26 Oct 2016, Lee Jones wrote:

> > > > 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.
> 
That's good news as the STi maintainer already acked and applied the patch.

Peter.