From: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
To: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>,
linuxppc-dev-mnsaURCQ41sdnm+yROfE0A@public.gmane.org,
devicetree-discuss-mnsaURCQ41sdnm+yROfE0A@public.gmane.org
Subject: Re: [PATCH 1/2] powerpc: i2c-mpc: preserve I2C clocking
Date: Wed, 01 Apr 2009 09:40:13 +0200 [thread overview]
Message-ID: <49D31A5D.8030204@grandegger.com> (raw)
In-Reply-To: <20090331230626.GB23304-787xzQ0H9iRg7VrjXcPTGA@public.gmane.org>
David Gibson wrote:
> On Tue, Mar 31, 2009 at 02:43:39PM +0200, Wolfgang Grandegger wrote:
>> The I2c node property "fsl,preserve-clocking" allows to overtake the
>> clock settings from the boot loader and avoids the hard-coded setting.
>
> Hrm. This is dubious. The device tree should generally describe
> hardware, not OS/driver behaviour which is what this appears to be
> doing. There are exceptions, but you need to justify them.
I think the purpose of this property is clear. How would you provide
that functionality instead? I suggested that a "clock-frequency = <0>"
property should do the trick but Grant preferred to be more explicit.
Wolfgang.
next prev parent reply other threads:[~2009-04-01 7:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-31 12:43 [PATCH 0/2] test Wolfgang Grandegger
2009-03-31 12:43 ` [PATCH 1/2] powerpc: i2c-mpc: preserve I2C clocking Wolfgang Grandegger
2009-03-31 23:06 ` David Gibson
[not found] ` <20090331230626.GB23304-787xzQ0H9iRg7VrjXcPTGA@public.gmane.org>
2009-04-01 7:40 ` Wolfgang Grandegger [this message]
[not found] ` <49D31A5D.8030204-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2009-04-02 0:07 ` David Gibson
2009-03-31 12:43 ` [PATCH 2/2] powerpc: i2c-mpc: make I2C bus speed configurable Wolfgang Grandegger
-- strict thread matches above, loose matches on Subject: below --
2009-03-31 12:50 [PATCH 0/2] " Wolfgang Grandegger
2009-03-31 12:50 ` [PATCH 1/2] powerpc: i2c-mpc: preserve I2C clocking Wolfgang Grandegger
[not found] ` <20090331125451.600446749-ynQEQJNshbs@public.gmane.org>
2009-03-31 13:39 ` Wolfram Sang
2009-03-31 13:47 ` Wolfgang Grandegger
[not found] ` <49D21EF1.9050200-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2009-03-31 13:56 ` Wolfram Sang
[not found] ` <20090331135629.GC3044-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2009-03-31 15:44 ` Grant Likely
[not found] ` <fa686aa40903310844j11a85fb6w3558923e12670ba9-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-03-31 20:05 ` Wolfgang Grandegger
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