From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Felipe Balbi <balbi@kernel.org>
Cc: Shawn Guo <shawn.guo@linaro.org>,
linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [PATCH v2] usb: dwc3: qcom: add URS Host support for sdm845 ACPI boot
Date: Fri, 15 Jan 2021 08:12:48 -0600 [thread overview]
Message-ID: <YAGi4N26BUdTeIPA@builder.lan> (raw)
In-Reply-To: <87mtxa1gb9.fsf@kernel.org>
On Fri 15 Jan 07:27 CST 2021, Felipe Balbi wrote:
> Hi,
>
> Shawn Guo <shawn.guo@linaro.org> writes:
> > For sdm845 ACPI boot, the URS (USB Role Switch) node in ACPI DSDT table
> > holds the memory resource, while interrupt resources reside in the child
> > nodes USB0 and UFN0. It adds USB0 host support by probing URS node,
> > creating platform device for USB0 node, and then retrieve interrupt
> > resources from USB0 platform device.
>
> just so I understand this: the interrupt was listed under a separate
> device altogether?
>
Correct, this seems to be the standard structure for a role-switching
usb controller, as shown under "ACPI System configuration" at
https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-dual-role-driver-stack-architecture
Regards,
Bjorn
> Nothing wrong with the patch itself, but just curious.
>
> --
> balbi
next prev parent reply other threads:[~2021-01-15 14:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-15 3:50 [PATCH v2] usb: dwc3: qcom: add URS Host support for sdm845 ACPI boot Shawn Guo
2021-01-15 4:02 ` Bjorn Andersson
2021-01-15 13:27 ` Felipe Balbi
2021-01-15 14:12 ` Bjorn Andersson [this message]
2021-01-18 11:28 ` Felipe Balbi
2021-03-01 19:59 ` patchwork-bot+linux-arm-msm
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=YAGi4N26BUdTeIPA@builder.lan \
--to=bjorn.andersson@linaro.org \
--cc=balbi@kernel.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=shawn.guo@linaro.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 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).