From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: David Brownell <david-b@pacbell.net>
Cc: Felipe Balbi <felipe.balbi@nokia.com>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Anton Vorontsov <avorontsov@ru.mvista.com>,
Grazvydas Ignotas <notasas@gmail.com>,
Madhusudhan Chikkature <madhu.cr@ti.com>,
linux-omap@vger.kernel.org, Greg Kroah-Hartman <gregkh@suse.de>
Subject: Re: [RFC/PATCH 1/5] usb: otg: add notifier support
Date: Tue, 26 Jan 2010 16:13:19 +0000 [thread overview]
Message-ID: <20100126161319.GX15759@rakim.wolfsonmicro.main> (raw)
In-Reply-To: <201001260744.46780.david-b@pacbell.net>
On Tue, Jan 26, 2010 at 07:44:46AM -0800, David Brownell wrote:
> On Tuesday 26 January 2010, Mark Brown wrote:
> > In the sort of design I'm talking about there is generally a system
> > power rail which is generated from the various power sources available
> > to the system, which might include a combination of batteries, USB and
> > wall adaptors.
> Just as an example: drivers/mfd/tps6510.c supports exactly
> that trio of power sources.
Yup, it's a fairly standard feature set for all in one PMICs, WM835x and
WM831x are also examples of this.
> More than one system rail though,
> which (as you know) is pretty common -- core != I/O.
Yes, in this context the system rail is the supply input to the
regulators rather than the regulated voltages that are (mostly)
used directly by the chips.
> Bus powered devices can come up on that 100mA, running
> enough to enumerate ... and request more power, if they
> need it.
> Not all Linux systems can boot with that little power!
Some can even brown themselves out going full pelt with the full 500mA
supply if there's no battery to supplement it :/
next prev parent reply other threads:[~2010-01-26 16:13 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-27 14:44 [PATCH] power_supply: Add driver for TWL4030/TPS65950 BCI charger Grazvydas Ignotas
2009-11-27 14:44 ` Grazvydas Ignotas
2009-11-27 14:54 ` Anton Vorontsov
2009-11-27 15:47 ` Grazvydas Ignotas
2009-11-27 16:23 ` Mark Brown
2009-11-30 18:45 ` Madhusudhan
2009-11-30 18:45 ` Madhusudhan
2009-11-30 18:58 ` Anton Vorontsov
2009-12-02 20:38 ` Grazvydas Ignotas
2009-12-02 20:38 ` Grazvydas Ignotas
2009-12-02 21:27 ` Anton Vorontsov
2009-12-02 21:27 ` Anton Vorontsov
2009-12-02 21:32 ` Grazvydas Ignotas
2009-11-30 21:33 ` Grazvydas Ignotas
2009-12-02 16:59 ` Madhusudhan
2009-12-02 16:59 ` Madhusudhan
2009-12-02 17:33 ` Felipe Balbi
2009-12-02 20:34 ` Grazvydas Ignotas
2009-12-02 20:49 ` Felipe Balbi
2009-12-02 20:49 ` Felipe Balbi
2009-12-02 21:29 ` Grazvydas Ignotas
2009-12-02 21:29 ` Grazvydas Ignotas
2009-12-02 21:54 ` Anton Vorontsov
2009-12-02 22:31 ` Felipe Balbi
2009-12-02 22:59 ` Anton Vorontsov
2009-12-03 8:39 ` Felipe Balbi
2009-12-03 10:55 ` Grazvydas Ignotas
2009-12-03 11:03 ` Felipe Balbi
2009-12-10 14:09 ` Grazvydas Ignotas
2009-12-10 14:18 ` Anton Vorontsov
2009-12-10 14:21 ` Felipe Balbi
2009-12-10 14:44 ` Anton Vorontsov
2009-12-10 16:51 ` Felipe Balbi
2009-12-10 20:51 ` Grazvydas Ignotas
2009-12-11 11:31 ` [RFC/PATCH 0/5] usb transceiver notifier Felipe Balbi
2009-12-11 11:31 ` Felipe Balbi
2009-12-11 11:31 ` [RFC/PATCH 1/5] usb: otg: add notifier support Felipe Balbi
2009-12-11 11:55 ` Mark Brown
2009-12-11 11:55 ` Mark Brown
2009-12-11 11:58 ` Felipe Balbi
2010-01-26 11:16 ` David Brownell
2010-01-26 13:11 ` Mark Brown
2010-01-26 13:35 ` David Brownell
2010-01-26 14:14 ` Felipe Balbi
2010-01-26 14:24 ` Oliver Neukum
2010-01-26 14:30 ` Felipe Balbi
2010-01-26 14:30 ` Felipe Balbi
2010-01-26 15:16 ` David Brownell
2010-01-26 15:21 ` David Brownell
2010-01-26 18:50 ` Felipe Balbi
2010-01-26 14:21 ` Mark Brown
2010-01-26 14:21 ` Mark Brown
2010-01-26 15:44 ` David Brownell
2010-01-26 16:13 ` Mark Brown [this message]
2010-01-26 14:10 ` Felipe Balbi
2010-01-26 14:19 ` Felipe Balbi
2010-01-26 15:33 ` David Brownell
2010-01-26 15:33 ` David Brownell
2010-01-26 15:07 ` David Brownell
2010-01-26 15:07 ` David Brownell
2010-01-26 19:09 ` Felipe Balbi
2010-01-26 19:15 ` Felipe Balbi
2010-01-26 19:15 ` Felipe Balbi
2009-12-11 11:31 ` [RFC/PATCH 2/5] usb: otg: twl4030: add support for notifier Felipe Balbi
2009-12-11 17:22 ` sai pavan
2009-12-11 17:22 ` sai pavan
2009-12-11 20:40 ` Felipe Balbi
2009-12-11 20:40 ` Felipe Balbi
2009-12-12 18:34 ` Mark Brown
2009-12-14 10:30 ` [RFC/PATCH 0/4] twl4030 threaded_irq support Felipe Balbi
2010-01-26 7:06 ` David Brownell
2010-01-26 7:06 ` David Brownell
2010-01-26 7:36 ` David Brownell
2010-01-26 7:36 ` David Brownell
2010-01-26 10:07 ` Mark Brown
2010-01-26 11:02 ` Felipe Balbi
2010-01-26 12:18 ` David Brownell
2010-01-26 12:18 ` David Brownell
2009-12-14 10:30 ` [RFC/PATCH 1/4] input: keyboard: twl4030: move to request_threaded_irq Felipe Balbi
2009-12-14 10:30 ` Felipe Balbi
2009-12-14 10:30 ` [RFC/PATCH 2/4] input: misc: " Felipe Balbi
2009-12-14 10:30 ` Felipe Balbi
2009-12-14 11:31 ` Shilimkar, Santosh
2009-12-14 11:40 ` Felipe Balbi
2009-12-14 13:16 ` Shilimkar, Santosh
2009-12-14 10:30 ` [RFC/PATCH 3/4] rtc: " Felipe Balbi
2009-12-14 10:30 ` [RFC/PATCH 4/4] usb: otg: " Felipe Balbi
2009-12-14 10:30 ` Felipe Balbi
2009-12-11 11:31 ` [RFC/PATCH 3/5] usb: musb: add support for ulpi block Felipe Balbi
2009-12-11 11:31 ` Felipe Balbi
2009-12-11 11:31 ` [RFC/PATCH 4/5] usb: musb: isp1704: add registers from isp1704 Felipe Balbi
2009-12-11 11:31 ` Felipe Balbi
2009-12-11 12:35 ` Krogerus Heikki (EXT-Teleca/Helsinki)
2009-12-11 12:35 ` Krogerus Heikki (EXT-Teleca/Helsinki)
2009-12-11 12:57 ` Felipe Balbi
2009-12-11 12:57 ` Felipe Balbi
2009-12-11 11:31 ` [RFC/PATCH 5/5] usb: musb: musb supports otg notifier Felipe Balbi
2009-12-11 11:40 ` Felipe Balbi
2009-12-11 11:40 ` Felipe Balbi
2009-12-30 19:07 ` [PATCH] power_supply: Add driver for TWL4030/TPS65950 BCI charger Madhusudhan
2009-12-30 19:07 ` Madhusudhan
2009-12-10 14:19 ` Felipe Balbi
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