From: Hans de Goede <hdegoede@redhat.com>
To: John Stultz <john.stultz@linaro.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
Yu Chen <chenyu56@huawei.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Chunfeng Yun <chunfeng.yun@mediatek.com>,
Felipe Balbi <balbi@kernel.org>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Jun Li <lijun.kernel@gmail.com>,
Valentin Schneider <valentin.schneider@arm.com>,
Linux USB List <linux-usb@vger.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>
Subject: Re: [RFC][PATCH 2/3] usb: roles: Add usb role switch notifier.
Date: Wed, 16 Oct 2019 11:10:32 +0200 [thread overview]
Message-ID: <7bd3a621-5983-90e3-8e1f-641a40007ddf@redhat.com> (raw)
In-Reply-To: <CALAqxLVh6GbiKmuK60e6f+_dWh-TS2ZLrwx0WsSo5bKp-F3iLA@mail.gmail.com>
Hi,
On 10/15/19 7:39 AM, John Stultz wrote:
> On Thu, Oct 3, 2019 at 1:51 PM Hans de Goede <hdegoede@redhat.com> wrote:
>> On 03-10-2019 22:37, John Stultz wrote:
>>> Fair point. I'm sort of taking a larger patchset and trying to break
>>> it up into more easily reviewable chunks, but I guess here I mis-cut.
>>>
>>> The user is the hikey960 gpio hub driver here:
>>> https://git.linaro.org/people/john.stultz/android-dev.git/commit/?id=b06158a2d3eb00c914f12c76c93695e92d9af00f
>>
>> Hmm, that seems to tie the TypeC data-role to the power-role, which
>> is not going to work with role swapping.
>
> Thanks again for the feedback here. Sorry for the slow response. Been
> reworking some of the easier changes but am starting to look at how to
> address your feedback here.
>
>> What is controlling the usb-role-switch, and thus ultimately
>> causing the notifier you are suggesting to get called ?
>
> The tcpm_mux_set() call via tcpm_state_machine_work()
>
>> Things like TYPEC_VBUS_POWER_OFF and TYPEC_VBUS_POWER_ON
>> really beg to be modeled as a regulator and then the
>> Type-C controller (using e.g. the drivers/usb/typec/tcpm/tcpm.c
>> framework) can use that regulator to control things.
>> in case of the tcpm.c framework it can then use that
>> regulator to implement the set_vbus callback.
>
> So I'm looking at the bindings and I'm not sure exactly how to tie a
> regulator style driver into the tcpm for this?
> Looking at the driver I just see this commented out bit:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/typec/tcpm/tcpm.c#n3075
>
> Do you happen to have a pointer to something closer to what you are describing?
Look at the tcpm_set_vbus implementation in drivers/usb/typec/tcpm/fusb302.c
you need to do something similar in your Type-C controller driver and
export the GPIO as as a gpio-controlled regulator and tie the regulator to
the connector.
Regards,
Han
next prev parent reply other threads:[~2019-10-16 9:10 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-02 23:16 [RFC][PATCH 0/3] dwc3 role-switch handling for HiKey960 John Stultz
2019-10-02 23:16 ` [RFC][PATCH 1/3] dt-bindings: usb: generic: Add role-switch-default-host binding John Stultz
2019-10-02 23:16 ` [RFC][PATCH 2/3] usb: roles: Add usb role switch notifier John Stultz
2019-10-03 9:25 ` Hans de Goede
2019-10-03 20:37 ` John Stultz
2019-10-03 20:51 ` Hans de Goede
2019-10-04 8:12 ` Heikki Krogerus
2019-10-15 5:39 ` John Stultz
2019-10-16 7:27 ` Hans de Goede
2019-10-18 5:55 ` John Stultz
2019-10-18 8:06 ` Hans de Goede
2019-10-18 18:39 ` John Stultz
2019-10-18 19:30 ` Hans de Goede
2019-10-18 19:53 ` John Stultz
2019-10-18 19:59 ` Hans de Goede
2019-10-18 20:12 ` John Stultz
2019-10-18 20:21 ` Hans de Goede
2019-10-18 20:37 ` John Stultz
2019-10-18 21:05 ` Hans de Goede
2019-10-22 5:58 ` John Stultz
2019-11-14 10:11 ` Hans de Goede
2019-11-15 0:23 ` John Stultz
2019-10-16 9:10 ` Hans de Goede [this message]
2019-10-03 11:26 ` Greg Kroah-Hartman
2019-10-03 20:45 ` John Stultz
2019-10-03 20:56 ` Hans de Goede
2019-10-03 21:33 ` John Stultz
2019-10-06 15:22 ` Hans de Goede
2019-10-15 7:03 ` John Stultz
2019-10-04 8:00 ` Heikki Krogerus
2019-10-02 23:16 ` [RFC][PATCH 3/3] usb: dwc3: Registering a role switch in the DRD code John Stultz
2019-10-15 8:25 ` Roger Quadros
2019-10-15 19:10 ` John Stultz
2019-10-16 9:24 ` Roger Quadros
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=7bd3a621-5983-90e3-8e1f-641a40007ddf@redhat.com \
--to=hdegoede@redhat.com \
--cc=andy.shevchenko@gmail.com \
--cc=balbi@kernel.org \
--cc=chenyu56@huawei.com \
--cc=chunfeng.yun@mediatek.com \
--cc=devicetree@vger.kernel.org \
--cc=gregkh@linuxfoundation.org \
--cc=heikki.krogerus@linux.intel.com \
--cc=john.stultz@linaro.org \
--cc=lijun.kernel@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=robh+dt@kernel.org \
--cc=suzuki.poulose@arm.com \
--cc=valentin.schneider@arm.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).