linux-kernel - [PATCH 0/2] phy: qcom-usb-hs: Add DT controlled VBUS pullup waggle

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Date:   Thu, 21 May 2020 01:50:29 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     agross@...nel.org, bjorn.andersson@...aro.org, kishon@...com,
        vkoul@...nel.org, robh+dt@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, bryan.odonoghue@...aro.org
Subject: [PATCH 0/2] phy: qcom-usb-hs: Add DT controlled VBUS pullup waggle

On an MSM8939 we have a system behind both a type-c controller and a USB
Hub. VBUS is not connected to the PHY and no GPIO is available to signal
VBUS state to the USB controller and PHY.

In this case we've used USB role-switching to transition between
host and device mode.

The current code in qcom-usb-hs only touches the VBUS pullup control bits
if we have an extcon but, setting those bits is still required on the
example I gave of the MSM8939.

This series takes the downstream concept of a DT driven flag for the VBUS
pullup bits and applies it to upstream in the poweron/poweroff path of the
PHY.

I've opted to unset the bits on PHY poweroff though in downstream the bits
are only ever switched on if the flag is present, downstream never switches
the bits off again. I think though, setting the bits off on PHY power-off
is the right thing to do, so I've done it.

Bryan O'Donoghue (2):
  dt-bindings: phy-qcom-usb-hs-phy: Add qcom,enable-vbus-pullup
  phy: qcom-usb-hs: Add qcom,enable-vbus-pullup support

 .../bindings/phy/qcom,usb-hs-phy.txt          |  8 +++++
 drivers/phy/qualcomm/phy-qcom-usb-hs.c        | 36 +++++++++++++++++++
 2 files changed, 44 insertions(+)

-- 
2.25.1