From: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
To: Stephen Boyd <swboyd@chromium.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 15:22:14 +0000 [thread overview]
Message-ID: <aa6aa234-e2d1-bdcd-0f0e-64b2a7e497d3@linaro.org> (raw)
In-Reply-To: <158458013177.152100.17920784952083533825@swboyd.mtv.corp.google.com>
On 19/03/2020 01:08, Stephen Boyd wrote:
> Quoting Bryan O'Donoghue (2020-03-11 12:14:56)
>> A USB connector should be a child node of the USB controller
>> connector/usb-connector.txt. This patch adds an example of how to do this
>> to the dwc3 binding descriptions.
>
> I read that as a child of the USB interface controller, which is not the
> same as the USB controller. For example, we're talking about having the
> usb connector be a child of the EC on ChromeOS devices because that
> manages the connector
>
>>
>> It is necessary to declare a connector as a child-node of a USB controller
>> for role-switching to work, so this example should be helpful to others
>> implementing that.
>
> 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.
At least that's my understanding.
---
bod
next prev parent reply other threads:[~2020-03-19 15:21 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 [this message]
2020-03-19 16:40 ` Stephen Boyd
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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