From: Chris Ball <cjb@laptop.org>
To: Daniel Drake <dsd@laptop.org>
Cc: linux-mmc@vger.kernel.org, jrudholm@gmail.com,
prakity@nvidia.com, devicetree-discuss@lists.ozlabs.org
Subject: Re: [PATCH 2/2] mmc: add no-1-8-v device tree flag
Date: Mon, 03 Dec 2012 14:04:26 -0500 [thread overview]
Message-ID: <8738znj6th.fsf@octavius.laptop.org> (raw)
In-Reply-To: <20121125180255.DB8ADFAD06@dev.laptop.org> (Daniel Drake's message of "Sun, 25 Nov 2012 13:02:54 -0500 (EST)")
Hi,
On Sun, Nov 25 2012, Daniel Drake wrote:
> The OLPC XO-1.75 laptop includes a SDHCI controller which is 1.8v
> capable, and it truthfully reports so in its capabilities. This
> alternate voltage is used for driving new "UHS-I" SD cards at their
> full speed.
>
> However, what the controller doesn't know is that the motherboard
> physically doesn't have a 1.8v supply available, so attempting to
> switch to the 1.8v level will result in a situation that cannot be
> recovered from without physically replugging the SD card.
>
> Add a device tree flag that can be used on systems like these,
> and hook it up to the equivalent SDHCI quirk.
>
> Signed-off-by: Daniel Drake <dsd@laptop.org>
Thanks, pushed to mmc-next for 3.8.
- Chris.
--
Chris Ball <cjb@laptop.org> <http://printf.net/>
One Laptop Per Child
prev parent reply other threads:[~2012-12-03 19:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-25 18:02 [PATCH 2/2] mmc: add no-1-8-v device tree flag Daniel Drake
2012-12-03 19:04 ` Chris Ball [this message]
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