From: Ben Dooks <ben.dooks@codethink.co.uk>
To: Ulf Hansson <ulf.hansson@linaro.org>,
Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: linux-kernel@lists.codethink.co.uk,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Ian Molton <ian@mnementh.co.uk>,
linux-mmc <linux-mmc@vger.kernel.org>,
Linux-sh list <linux-sh@vger.kernel.org>
Subject: Re: [Linux-kernel] [RFC PATCH 5/7] mmc: sh_mobile_sdhi: Add UHS-I mode support
Date: Tue, 05 May 2015 11:35:21 +0300 [thread overview]
Message-ID: <554880C9.8080201@codethink.co.uk> (raw)
In-Reply-To: <CAPDyKFodZscxZJmKgYyMV8m8mNWYc9GitkoKbixTKS5r7rv_fA@mail.gmail.com>
On 05/05/15 10:56, Ulf Hansson wrote:
> On 30 April 2015 at 14:32, Ben Hutchings <ben.hutchings@codethink.co.uk> wrote:
>> Implement voltage switch, supporting modes up to SDR-50.
>>
>> Based on work by Shinobu Uehara, Rob Taylor, William Towle and Ian Molton.
>>
>> This uses two voltage regulators, one external and one on the pfc.
>
> Why two? If there is a parent child relation ship, that should be
> handled through the regulator tree, right!? Please elaborate.
The card main power is separate from the IO line voltages.
To get to the high-speed, card power is left at 3.3V and the IO
voltage is changed to 1.8V.
In the systems we have the power gate is separate from the controls
for the IO but not integrated into the MMC controller itself.
--
Ben Dooks http://www.codethink.co.uk/
Senior Engineer Codethink - Providing Genius
next prev parent reply other threads:[~2015-05-05 8:35 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-30 12:29 [RFC PATCH 0/7] UHS-I support for sh_mobile_sdhi Ben Hutchings
2015-04-30 12:31 ` [RFC PATCH 2/7] mmc: sh_mobile_sdhi: Add actual clock rate support Ben Hutchings
2015-04-30 16:34 ` Sergei Shtylyov
[not found] ` <554259A0.9030307-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org>
2015-05-06 1:05 ` Ben Hutchings
2015-05-06 1:10 ` Ben Hutchings
2015-04-30 12:31 ` [RFC PATCH 3/7] pinctrl: sh-pfc: r8a7790: Add regulators for SD voltage switch Ben Hutchings
2015-05-05 7:52 ` Ulf Hansson
2015-05-06 1:12 ` Ben Hutchings
2015-04-30 12:31 ` [RFC PATCH 4/7] ARM: shmobile: r8a7790: Add nodes for pfc SD voltage regulators Ben Hutchings
2015-05-01 0:57 ` Simon Horman
2015-05-06 1:18 ` Ben Hutchings
[not found] ` <1430875082.4222.28.camel-2NU49sBE5Aze9VDwLV8dzJPsBRI6B4nW9dF7HbQ/qKg@public.gmane.org>
2015-05-07 4:33 ` Simon Horman
2015-04-30 12:32 ` [RFC PATCH 5/7] mmc: sh_mobile_sdhi: Add UHS-I mode support Ben Hutchings
2015-04-30 16:04 ` Sergei Shtylyov
[not found] ` <554252A1.6070302-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org>
2015-05-06 1:41 ` Ben Hutchings
2015-05-05 7:56 ` Ulf Hansson
2015-05-05 8:35 ` Ben Dooks [this message]
[not found] ` <554880C9.8080201-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
2015-05-05 8:47 ` [Linux-kernel] " Ulf Hansson
2015-05-06 1:38 ` Ben Hutchings
2015-05-06 8:44 ` Ulf Hansson
2015-05-06 13:49 ` Ben Hutchings
2015-05-11 8:54 ` Ulf Hansson
2015-05-11 14:01 ` Ben Hutchings
2015-05-11 14:58 ` Ulf Hansson
2015-04-30 12:32 ` [RFC PATCH 6/7] ARM: shmobile: r8a7790-lager.dts: Set sdhi and mmcif clock rates Ben Hutchings
2015-04-30 16:06 ` Sergei Shtylyov
2015-05-06 1:44 ` Ben Hutchings
[not found] ` <1430397166.5802.45.camel-2NU49sBE5Aze9VDwLV8dzJPsBRI6B4nW9dF7HbQ/qKg@public.gmane.org>
2015-05-01 0:59 ` Simon Horman
[not found] ` <20150501005920.GH13754-/R6kz+dDXgpPR4JQBCEnsQ@public.gmane.org>
2015-05-06 1:46 ` Ben Hutchings
2015-05-07 4:29 ` Simon Horman
[not found] ` <1430396995.5802.39.camel-2NU49sBE5Aze9VDwLV8dzJPsBRI6B4nW9dF7HbQ/qKg@public.gmane.org>
2015-04-30 12:30 ` [RFC PATCH 1/7] mmc: tmio: Add UHS-I mode support Ben Hutchings
2015-05-11 3:38 ` Kuninori Morimoto
[not found] ` <87egmn4wfo.wl%kuninori.morimoto.gx-zM6kxYcvzFBBDgjK7y7TUQ@public.gmane.org>
2015-05-11 14:04 ` Ben Hutchings
2015-05-11 14:10 ` Ben Hutchings
2015-04-30 12:33 ` [RFC PATCH 7/7] ARM: shmobile: r8a7790-lager.dts: Assert UHS-I SDR-50 capability Ben Hutchings
2015-04-30 16:08 ` Sergei Shtylyov
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