From: James Kosin <jkosin@beta.intcomgrp.com>
To: linux-kernel@vger.kernel.org
Subject: Re: [RFD] voltage/current regulator consumer interface
Date: Mon, 20 Apr 2009 11:38:49 -0400 [thread overview]
Message-ID: <49EC9709.8070002@support.intcomgrp.com> (raw)
In-Reply-To: <ct38K-3Fq-11@gated-at.bofh.it>
Mike Rapoport wrote:
> Hi,
>
> Recently there was a brief discussion on linux-arm-kernel list [1] about
> controlling voltage regulator state in cases when there is no consumer device
> for a particular regulator.
>
> I have some thoughts but I'd like to know people opinion before I start
> implementation.
>
> Problem
> -------
> The regulator framework API provides ability to control the state of
> voltage/current regulators from within the kernel. Usually the regulator
> supplies power to a device and device driver or some hooks to the platform code
> from the device driver manipulate the regulator state. However, the regulator
> framework does not have userspace ABI that allows regulator state modifications.
> Lack of this ABI prevents fine-grained control for power consumption of devices
> such as GPS trancievers and GSM modems. Moreover, in SoC based systems it is
> possible to switch on/off power to entire subsystem when it is not used.
>
I'd also ask the question, Why?
If exposing to user space it leaves the possibility of damaging hardware
or completely frying a board.
James
next parent reply other threads:[~2009-04-20 16:19 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <ct38K-3Fq-11@gated-at.bofh.it>
2009-04-20 15:38 ` James Kosin [this message]
2009-04-21 6:07 ` [RFD] voltage/current regulator consumer interface Mike Rapoport
2009-04-21 13:25 ` James Kosin
2009-04-21 14:05 ` Mike Rapoport
2009-04-21 14:31 ` James Kosin
2009-04-25 8:19 ` Pavel Machek
2009-04-25 9:04 ` Mark Brown
2009-04-27 13:47 ` James Kosin
2009-04-27 14:21 ` Mark Brown
2009-04-21 14:30 ` Mark Brown
2009-04-21 10:05 ` Mark Brown
[not found] ` <ct38K-3Fq-9@gated-at.bofh.it>
[not found] ` <ctmXD-1yA-3@gated-at.bofh.it>
[not found] ` <ctnK4-2zP-11@gated-at.bofh.it>
[not found] ` <ctoG9-458-7@gated-at.bofh.it>
[not found] ` <ctoG9-458-5@gated-at.bofh.it>
[not found] ` <ctoPK-4y5-5@gated-at.bofh.it>
[not found] ` <ctoZv-4KN-23@gated-at.bofh.it>
[not found] ` <ctFxn-5OC-11@gated-at.bofh.it>
[not found] ` <ctG0r-6HL-31@gated-at.bofh.it>
2009-04-22 14:31 ` James Kosin
2009-04-22 14:49 ` Alan Cox
2009-04-22 15:00 ` James Kosin
2009-04-20 14:32 Mike Rapoport
2009-04-20 14:56 ` Mark Brown
2009-04-21 12:00 ` Mike Rapoport
2009-04-21 12:55 ` Mark Brown
2009-04-21 13:54 ` Mike Rapoport
2009-04-21 13:56 ` Mark Brown
2009-04-21 14:01 ` Mike Rapoport
2009-04-21 14:14 ` Mark Brown
2009-04-22 7:57 ` Mike Rapoport
2009-04-22 8:26 ` Mark Brown
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=49EC9709.8070002@support.intcomgrp.com \
--to=jkosin@beta.intcomgrp.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.