From: NeilBrown <neilb@suse.com>
To: Mark Brown <broonie@kernel.org>
Cc: Baolin Wang <baolin.wang@linaro.org>,
Felipe Balbi <balbi@kernel.org>,
Greg KH <gregkh@linuxfoundation.org>,
Sebastian Reichel <sre@kernel.org>,
Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
David Woodhouse <dwmw2@infradead.org>,
robh@kernel.org, Jun Li <jun.li@nxp.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Ruslan Bilovol <ruslan.bilovol@gmail.com>,
Peter Chen <peter.chen@freescale.com>,
Alan Stern <stern@rowland.harvard.edu>,
r.baldyga@samsung.com, grygorii.strashko@ti.com,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
Lee Jones <lee.jones@linaro.org>,
Charles Keepax <ckeepax@opensource.wolfsonmicro.com>,
patches@opensource.wolfsonmicro.com,
Linux PM list <linux-pm@vger.kernel.org>,
USB <linux-usb@vger.kernel.org>,
device-m
Subject: Re: [PATCH v16 0/4] Introduce usb charger framework to deal with the usb gadget power negotation
Date: Wed, 14 Sep 2016 19:50:00 +0200 [thread overview]
Message-ID: <87oa3qz7zr.fsf@notabene.neil.brown.name> (raw)
In-Reply-To: <20160914145703.GX27946@sirena.org.uk>
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On Wed, Sep 14 2016, Mark Brown wrote:
> TI do a lot of the more software managed chargers (which I suspect are
> the main thing Felipe will have looked at) if that's what you're
> referring to here? The device is implementing pretty much the algorithm
> you're describing in that e-mail so I'm a bit confused as to what you're
> saying here.
Ah.... my mistake, sorry.
When earlier you said:
> It's a
> current limiter intended to sit in line with the USB power lines to
> ensure the system doesn't go over the maximum current draw (and also
> integrates with the power source selection logic the chip has to pick
> the best available power source for the system).
I assumed that all it did was limit the current to number given.
If it also limits the current to ensure that voltage doesn't drop
unduly, then I agree with your assertion that it just needs to be told
the upper limit.
I hope you'll agree that other drivers might need to know the lower
limit, so reporting both to all drivers is sensible.
Thanks,
NeilBrown
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next prev parent reply other threads:[~2016-09-14 17:50 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-01 7:09 [PATCH v16 0/4] Introduce usb charger framework to deal with the usb gadget power negotation Baolin Wang
2016-08-01 7:09 ` [PATCH v16 1/4] usb: gadget: Introduce the usb charger framework Baolin Wang
2016-08-01 7:09 ` [PATCH v16 2/4] usb: gadget: Support for " Baolin Wang
2016-08-01 7:09 ` [PATCH v16 3/4] usb: gadget: Integrate with the usb gadget supporting for usb charger Baolin Wang
2016-08-01 7:09 ` [PATCH v16 4/4] power: wm831x_power: Support USB charger current limit management Baolin Wang
[not found] ` <cover.1470034830.git.baolin.wang-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2016-08-11 3:14 ` [PATCH v16 0/4] Introduce usb charger framework to deal with the usb gadget power negotation Baolin Wang
2016-08-29 9:02 ` Baolin Wang
2016-09-06 5:40 ` NeilBrown
[not found] ` <8760q9a8m6.fsf-wvvUuzkyo1HefUI2i7LXDhCRmIWqnp/j@public.gmane.org>
2016-09-06 7:40 ` Felipe Balbi
2016-09-08 6:55 ` Baolin Wang
2016-09-08 7:31 ` NeilBrown
2016-09-08 8:12 ` Baolin Wang
2016-09-08 23:13 ` NeilBrown
2016-09-09 6:46 ` Baolin Wang
2016-09-09 21:19 ` NeilBrown
2016-09-18 9:39 ` Baolin Wang
2016-10-05 7:26 ` Baolin Wang
2016-10-05 7:47 ` Felipe Balbi
[not found] ` <878tu3p78u.fsf-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2016-10-05 7:57 ` Baolin Wang
2016-10-05 10:44 ` NeilBrown
2016-10-08 3:18 ` Baolin Wang
2016-09-09 11:07 ` Mark Brown
2016-09-09 21:57 ` NeilBrown
2016-09-12 12:25 ` Mark Brown
[not found] ` <20160912122549.GZ27946-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-09-12 13:27 ` NeilBrown
[not found] ` <87inu11c5l.fsf-wvvUuzkyo1HefUI2i7LXDhCRmIWqnp/j@public.gmane.org>
2016-09-12 15:26 ` Mark Brown
2016-09-13 8:00 ` NeilBrown
2016-09-14 11:16 ` Mark Brown
2016-09-14 14:11 ` NeilBrown
2016-09-14 14:57 ` Mark Brown
2016-09-14 17:50 ` NeilBrown [this message]
2016-09-14 18:02 ` Mark Brown
2016-09-15 10:33 ` Pavel Machek
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