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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87vbij1vuk.fsf@free.fr>
Date:	Mon, 02 Mar 2015 12:29:07 +0100
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Lee Jones <lee.jones@...aro.org>
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

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>

-- 
Robert
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/