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From: Lee Jones <>
To: Robert Jarzmik <>
Subject: Re: [PATCH v3 0/4] clk: st: New always-on clock domain
Date: Mon, 2 Mar 2015 08:30:19 +0000	[thread overview]
Message-ID: <20150302083019.GD31325@x1> (raw)
In-Reply-To: <>

On Sat, 28 Feb 2015, Robert Jarzmik wrote:

> Lee Jones <> writes:
> >> I wonder why there is a need for a new clock when CLK_IGNORE_UNUSED does
> >> exist. What is the usecase that is covered by this patchset which is not used by
> >> CLK_IGNORE_UNUSED clock flag ?
> >> 
> >> And if that reason exists, I'd like to find it in the commit message.
> >
> > The problem is applying that flag in a generic way.
> >
> > However, I guess you haven't seen this [1] yet?
> >
> > [1]
> I have.
> And yet :
>  1) This won't go in a _commit_ message (as opposed to cover-letter). Moreover

Did you read rest of the set, or just the cover-letter?  I referenced
0/0 because it is the thread parent and from there you can drill down
into the commits where I believe there is adequate explanation in
each.  If you could be more specific and tell me which commit you
think requires more explanation, I'd be happy to take a look.

>     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

> 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?

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.

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

  reply	other threads:[~2015-03-02  8:30 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-24 17:33 Lee Jones
2015-02-24 17:33 ` [PATCH v3 1/4] ARM: sti: stih407-family: Supply defines for CLOCKGEN A0 Lee Jones
2015-02-24 17:33 ` [PATCH v3 2/4] ARM: sti: stih407-family: Add platform interconnects to always-on clk domain Lee Jones
2015-02-24 17:33 ` [PATCH v3 3/4] clk: Provide an always-on clock domain framework Lee Jones
2015-02-24 17:33 ` [PATCH v3 4/4] clk: dt: Introduce always-on clock domain documentation Lee Jones
2015-02-24 17:42 ` [PATCH v3 0/4] clk: st: New always-on clock domain Lee Jones
2015-02-27 21:37 ` Robert Jarzmik
2015-02-27 21:49   ` Lee Jones
2015-02-27 23:38     ` Robert Jarzmik
2015-03-02  8:30       ` Lee Jones [this message]
2015-03-02 11:29         ` Robert Jarzmik
2015-03-02 11:37           ` Lee Jones
2015-03-04 12:00 ` Lee Jones
2015-03-06 19:08   ` Mike Turquette
2015-03-09  9:28     ` Lee Jones
2015-03-25  4:11       ` Geert Uytterhoeven
2015-03-26 13:51         ` Lee Jones
2015-03-26 16:55           ` Geert Uytterhoeven
2015-03-26 19:38             ` Lee Jones
2015-04-02  8:31               ` Geert Uytterhoeven
2015-04-02 10:48                 ` Lee Jones

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