Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the usb gadget power negotation

From	NeilBrown <neilb@suse.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the usb gadget power negotation
Date	2016-11-08 21:40 +0100
Message-ID	<sBllw-5TP-9@gated-at.bofh.it> (permalink)
References	(3 earlier) <sxeVj-8rj-15@gated-at.bofh.it> <sy8kN-3fc-7@gated-at.bofh.it> <syGPv-nk-15@gated-at.bofh.it> <szf0R-5x4-21@gated-at.bofh.it> <sBaq6-76t-33@gated-at.bofh.it>
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On Tue, Nov 08 2016, Peter Chen wrote:

> On Thu, Nov 03, 2016 at 12:25:42PM +1100, NeilBrown wrote:
>> 
>> 
>> 
>> 2/ Change all usb phys to register an extcon and to send appropriate
>>    notifications.  Many already do, but I don't think it is universal.
>>    It is probable that the extcon should be registered using common code
>>    instead of each phy driver having its own
>>    extcon_get_edev_by_phandle()
>>    or whatever.
>>    If the usb phy driver needs to look at battery charger registers to
>>    know what sort of cable was connected (which I believe is the case
>>    for the chips you are interested in), then it should do that.
>
> Not only USB PHY to register an extcon, but also for the drivers which
> can detect USB charger type, it may be USB controller driver, USB type-c
> driver, pmic driver, and these drivers may not have an extcon device
> since the internal part can finish the vbus detect.

Can you point to an example of the sort of hardware/driver you are
referring to, preferably in the mainline kernel.  Concrete examples make
this sort of thing much easier to understand.

I think I would argue that if some piece of hardware can detect the USB
charger type, then that piece of hardware is part of the "USB PHY", even
if the hardware manufacturer has chosen to partition the register set in
a way which doesn't make that obvious.

NeilBrown

Thread

Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the  usb gadget power negotation Baolin Wang <baolin.wang@linaro.org> - 2016-10-27 09:40 +0200
  Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the usb gadget power negotation NeilBrown <neilb@suse.com> - 2016-10-28 00:10 +0200
    Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the  usb gadget power negotation Baolin Wang <baolin.wang@linaro.org> - 2016-10-28 15:00 +0200
      Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the  usb gadget power negotation Mark Brown <broonie@kernel.org> - 2016-10-28 19:10 +0200
        Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the  usb gadget power negotation Baolin Wang <baolin.wang@linaro.org> - 2016-10-31 12:30 +0100
      Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the usb gadget power negotation NeilBrown <neilb@suse.com> - 2016-10-31 01:10 +0100
        Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the  usb gadget power negotation Baolin Wang <baolin.wang@linaro.org> - 2016-11-01 14:00 +0100
          Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the usb gadget power negotation NeilBrown <neilb@suse.com> - 2016-11-03 02:30 +0100
            Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the  usb gadget power negotation Baolin Wang <baolin.wang@linaro.org> - 2016-11-07 09:20 +0100
              Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the usb gadget power negotation NeilBrown <neilb@suse.com> - 2016-11-07 22:00 +0100
                Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the  usb gadget power negotation Baolin Wang <baolin.wang@linaro.org> - 2016-11-10 10:50 +0100
            Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the  usb gadget power negotation Peter Chen <hzpeterchen@gmail.com> - 2016-11-08 10:00 +0100
              Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the usb gadget power negotation NeilBrown <neilb@suse.com> - 2016-11-08 21:40 +0100
                Re: [PATCH v18 0/4] Introduce usb charger framework to deal with the  usb gadget power negotation Peter Chen <hzpeterchen@gmail.com> - 2016-11-09 02:40 +0100

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