linux-kernel - Re: [PATCH v3 0/4] clk: st: New always-on clock domain

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Message-ID: <20150302113718.GG32347@x1>
Date:	Mon, 2 Mar 2015 11:37:18 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	mturquette@...aro.org, sboyd@...eaurora.org, kernel@...inux.com,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v3 0/4] clk: st: New always-on clock domain

On Mon, 02 Mar 2015, Robert Jarzmik wrote:

> Lee Jones <lee.jones@...aro.org> writes:
> 
> > On Sat, 28 Feb 2015, Robert Jarzmik wrote:
> >
> >> Lee Jones <lee.jones@...aro.org> writes:
> >>     it doesn't specify which usecase is not covered by CLK_IGNORE_UNUSED, it
> >>     says, up to my understanding, that is it another way to have to
> >>     CLK_IGNORE_UNUSED flag applied.
> >
> > Well that is exactly what we're doing.  Is there an issue with that?
> >
> > This is a way to do it at a platform level.  It means we can support
> > multiple platforms where clocksources have been switched around
> > without writing new driver code in drivers/clk/st.
> >
> > If you have something else in mind, let me know.
> >
> >>  2) I still fail to see why this is necessary
> >>     IOW why declaring the mandatory always-on clocks with the proper flag should
> >>     be augmented with a new clock list. Isn't the existing flag the generic way
> >>     ?
> >
> > I'm not sure what you mean by this, would you be able to expland a
> > little?
> >
> >> I might not understand the real motivation behind that of course, that's why I'm
> >> asking.
> >
> > Please bear in mind that we don't supply our clocks statically.  All
> > of the information is extracted from DT, so if the always-on
> > information does reside in there, where do you propose it comes from?
> 
> I thought the standard clock binding provided a way to set this flag. Now I
> crosschecked the binding, it doesn't ...
> 
> My point was I didn't want the flag to be settable from 2 different places,
> where consistency was to be kept across different device-tree leafs.
> 
> > We could just write this code inside our own driver and apply the
> > CLK_IGNORE_UNUSED at a local level, but that's not the generic
> > solution I am searching for.
> 
> All right, I'm convinced now I undertand the flag was not settable from
> devicetree binding before this patchset.
> 
> You can add to patch 3/4 :
> Reviewed-by: Robert Jarzmik <robert.jarzmik@...e.fr>

Until told otherwise, I'm going to apply this onto the other
patchset.  This one has already been NACKed, due to DT push-back.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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