linux-kernel - [RFC PATCH 0/1] usb: dwc3: Extcon hotplug support to of-simple

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Date:   Fri, 22 May 2020 21:12:00 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     enric.balletbo@...labora.com, bleung@...omium.org,
        groeck@...omium.org, Prashant Malani <pmalani@...omium.org>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org (open list:DESIGNWARE USB3 DRD IP DRIVER)
Subject: [RFC PATCH 0/1] usb: dwc3: Extcon hotplug support to of-simple

Some platforms like rk3399 would like to power on the USB PHY layer only
when external devices are connected. This patch introduces optional
support for extcon USB_HOST events, so that child devices are
populated/depopulated when external devices are connected/disconnected,
respectively.

This is also useful since some PHY drivers like phy-rockchip-typec only
configure their Type C Phy on power on; if they are only powered on once
at boot by dwc3, these drivers will not be able to reconfigure their PHY
for peripherals plugged in later, like (Display Port) DP monitors.

I thought I’d send out an initial RFC patch, for comments and feedback
about the approach. Depending on feedback, we can refine this approach
and modify the bindings file.

Thanks,

Prashant Malani (1):
  usb: dwc3: of-simple: Add extcon support

 drivers/usb/dwc3/dwc3-of-simple.c | 149 +++++++++++++++++++++++++++++-
 1 file changed, 146 insertions(+), 3 deletions(-)

-- 
2.27.0.rc0.183.gde8f92d652-goog