From: Liam Girdwood <lrg@kernel.org>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: linux-kernel@vger.kernel.org, patches@opensource.wolfsonmicro.com
Subject: Re: [PATCH] regulator: Support voltage offsets to compensate for drops in system
Date: Mon, 09 May 2011 17:01:35 +0100 [thread overview]
Message-ID: <1304956895.3192.16.camel@odin> (raw)
In-Reply-To: <1304889217-12319-1-git-send-email-broonie@opensource.wolfsonmicro.com>
On Sun, 2011-05-08 at 22:13 +0100, Mark Brown wrote:
> Some systems, particularly physically large systems used for early
> prototyping, may experience substantial voltage drops between the regulator
> and the consumers as a result of long traces in the system. With these
> systems voltages may need to be set higher than requested in order to
> ensure reliable system operation.
>
> Allow systems to work around such hardware issues by allowing constraints
> to supply an offset to be applied to any requested and reported voltages.
> This is not ideal, especially since the voltage drop may be load dependant,
> but is sufficient for most affected systems, it is not expected to be used
> in production hardware. The offset is applied after all constraint
> processing so constraints should be specified in terms of consumer values
> not physically configured values.
>
> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
> ---
Applied.
Thanks
Liam
prev parent reply other threads:[~2011-05-09 16:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-08 21:13 [PATCH] regulator: Support voltage offsets to compensate for drops in system Mark Brown
2011-05-09 16:01 ` Liam Girdwood [this message]
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