From: Stephen Boyd <swboyd@chromium.org>
To: Bryan O'Donoghue <bryan.odonoghue@linaro.org>,
balbi@kernel.org, gregkh@linuxfoundation.org,
linux-usb@vger.kernel.org
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
bjorn.andersson@linaro.org, jackp@codeaurora.org,
robh@kernel.org, Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org
Subject: Re: [PATCH 2/7] dt-bindings: usb: dwc3: Add a gpio-usb-connector example
Date: Thu, 19 Mar 2020 09:40:45 -0700 [thread overview]
Message-ID: <158463604559.152100.9219030962819234620@swboyd.mtv.corp.google.com> (raw)
In-Reply-To: <aa6aa234-e2d1-bdcd-0f0e-64b2a7e497d3@linaro.org>
Quoting Bryan O'Donoghue (2020-03-19 08:22:14)
> On 19/03/2020 01:08, Stephen Boyd wrote:
> >
> > Maybe it should be a virtual node at the root of the DT if it's GPIO
> > controlled? And then the phy can be connected to the usb connector
> > through the graph binding.
>
> Graph binding can probably work.
>
> Re: the PHY.
>
> For myself the hardware model is
>
> Connector -> PHY -> Host controller -> Host controller wrapper
>
> Only
>
> Connector -> Host controller -> Host controller wrapper
>
> care about the USB role though.
>
> If your PHY did care about the role, you'd really need to write a
> connector/phy type-c type driver, to detect the state and toggle your
> PHY bits before doing usb_role_switch_set_role() back to DWC3.
>
Yes some PHYs do care about the role. Sometimes they have to toggle some
bit to switch between host and gadget mode for example. I haven't fully
read this patch series but maybe the PHY can be the one that controls
the gpio for the connector?
We (ChromeOS) need to integrate the type-c connector class, etc. on
sc7180 with the dwc3 driver and the current thinking has the type-c
connectors underneath the cros_ec node because the EC is the type-c
manager. The EC will have a type-c driver associated with it.
next prev parent reply other threads:[~2020-03-19 16:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 19:14 [PATCH 0/7] DWC3/Qualcomm connector based role-switching Bryan O'Donoghue
2020-03-11 19:14 ` [PATCH 1/7] usb: dwc3: Registering a role switch in the DRD code Bryan O'Donoghue
2020-03-11 19:14 ` [PATCH 2/7] dt-bindings: usb: dwc3: Add a gpio-usb-connector example Bryan O'Donoghue
2020-03-19 1:08 ` Stephen Boyd
2020-03-19 15:22 ` Bryan O'Donoghue
2020-03-19 16:40 ` Stephen Boyd [this message]
2020-03-19 18:03 ` Bryan O'Donoghue
2020-03-19 20:30 ` Stephen Boyd
2020-03-11 19:14 ` [PATCH 3/7] dt-bindings: usb: dwc3: Add a usb-role-switch to the example Bryan O'Donoghue
2020-03-11 19:14 ` [PATCH 4/7] usb: dwc3: qcom: Add support for usb-conn-gpio connectors Bryan O'Donoghue
2020-03-11 19:14 ` [PATCH 5/7] usb: dwc3: " Bryan O'Donoghue
2020-03-11 19:15 ` [PATCH 6/7] usb: dwc3: Add support for a role-switch notifier Bryan O'Donoghue
2020-07-23 8:13 ` Vincent Whitchurch
2020-03-11 19:15 ` [PATCH 7/7] usb: dwc3: qcom: Enable gpio-usb-conn based role-switching Bryan O'Donoghue
2020-03-17 6:31 ` Bjorn Andersson
2020-03-17 15:22 ` Bryan O'Donoghue
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