linux-kernel - Re: [PATCH v3 0/3] Add devicetree support of USB for QDU/QRU1000

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Date: Thu, 2 May 2024 15:18:05 +0530
From: Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Komal Bajaj
	<quic_kbajaj@...cinc.com>
CC: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        Rob Herring <robh@...nel.org>,
        "Krzysztof
 Kozlowski" <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bjorn Andersson <quic_bjorande@...cinc.com>, <quic_wcheng@...cinc.com>,
        <quic_ppratap@...cinc.com>, Jack Pham
	<quic_jackp@...cinc.com>
Subject: Re: [PATCH v3 0/3] Add devicetree support of USB for QDU/QRU1000



On 5/2/2024 2:39 PM, Dmitry Baryshkov wrote:
> On Thu, 2 May 2024 at 12:04, Komal Bajaj <quic_kbajaj@...cinc.com> wrote:
>>
>> This series adds devicetree nodes to support interconnects and usb for qdu/qru1000.
>> This is based on previously sent driver series[1].
>>
>> ------
>> Changes in v3:
>> * As per comments on upstream[2], to get role-switch working on QDU/QRU1000, it was recommended to
>>    use the actual TI switch driver. Since driver doesn't have the functionality to provide role-switch
>>    based on gpio, thus reverting back USB dr_mode to peripheral and removed the remote end-point nodes
>>    and usb-conn-gpio based role switch functionality.
> 
> This is not correct. The recommendation was to describe hardware properly.
> Which means adding schema description, adding  ti,your-switch
> compatible to the usb-conn-gpio.c driver, etc.
> 

Hi Dmitry,

  Sorry for the confusion. In the comments [1],

"So the compatible string should be "ti,hd3ss3220". Which is fine to be
used in the platform driver. Just describe the differences in the
schema."

The compatible "ti,hd3ss3220" is already associated with a TI switch 
driver [2]. But it works based on I2C. So we assumed you wanted us to 
make changes to [2] by adding GPIO functionality (which usb-conn-gpio 
exactly does), since the compatible you suggested matched with the TI 
driver.

If it was to add compatible in usb-conn-gpio, then we can support OTG 
functionality with no schema changes I believe, but the compatible 
string might need a different name to avoid clashing with the name in [2].

[1]: 
https://lore.kernel.org/all/CAA8EJppNZrLzT=vGS0NXnKJT_wL+bMB9jFhJ9K7b7FPgFQbcig@mail.gmail.com/

[2]: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/typec/hd3ss3220.c?h=v6.9-rc2

Regards,
Krishna,

>> * Link to v2: https://lore.kernel.org/linux-arm-msm/20240319091020.15137-1-quic_kbajaj@quicinc.com/
>>
>> Changes in v2:
>> * Changes qmpphy node name
>> * Changes dr_mode to otg and added USB-B port USB role switch
>> * Dropped maximum-speed property from usb dwc3 node
>> * Link to v1: https://lore.kernel.org/linux-arm-msm/20240311120859.18489-1-quic_kbajaj@quicinc.com/
>>
>> [1] https://lore.kernel.org/linux-arm-msm/20240502082017.13777-1-quic_kbajaj@quicinc.com/
>> [2] https://lore.kernel.org/all/CAA8EJppNZrLzT=vGS0NXnKJT_wL+bMB9jFhJ9K7b7FPgFQbcig@mail.gmail.com/
>> ------
>>
>> Komal Bajaj (3):
>>    arm64: dts: qcom: qdu1000: Add USB3 and PHY support
>>    arm64: dts: qcom: qdu1000-idp: enable USB nodes
>>    arm64: dts: qcom: qru1000-idp: enable USB nodes
>>
>>   arch/arm64/boot/dts/qcom/qdu1000-idp.dts |  23 +++++
>>   arch/arm64/boot/dts/qcom/qdu1000.dtsi    | 120 +++++++++++++++++++++++
>>   arch/arm64/boot/dts/qcom/qru1000-idp.dts |  23 +++++
>>   3 files changed, 166 insertions(+)
>>
>> --
>> 2.42.0
>>
>>
> 
>