linux-kernel - Re: [PATCH 6/8] usb: misc: eud: Add High-Speed Phy control for EUD operations

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Message-ID: <240305c2-54d3-4b75-a938-7b40abedddc9@quicinc.com>
Date: Wed, 31 Jul 2024 15:38:20 -0700
From: Elson Serrao <quic_eserrao@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <gregkh@...uxfoundation.org>
CC: <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 6/8] usb: misc: eud: Add High-Speed Phy control for EUD
 operations



On 7/30/2024 10:39 PM, Krzysztof Kozlowski wrote:
> On 31/07/2024 00:24, Elson Roy Serrao wrote:
>> The Embedded USB Debugger(EUD) is a HS-USB on-chip hub to support the
>> debug and trace capabilities on Qualcomm devices. It is physically
>> present in between the usb connector and the usb controller. Being a
>> HS USB hub, it relies on HS Phy for its functionality. Add HS phy
>> support in the eud driver and control the phy during eud enable/disable
>> operations.
>>
> 
> ...
>>  static ssize_t enable_show(struct device *dev,
>> @@ -186,6 +216,11 @@ static int eud_probe(struct platform_device *pdev)
>>  
>>  	chip->dev = &pdev->dev;
>>  
>> +	chip->usb2_phy = devm_phy_get(chip->dev, "usb2-phy");
>> +	if (IS_ERR(chip->usb2_phy))
>> +		return dev_err_probe(chip->dev, PTR_ERR(chip->usb2_phy),
>> +				     "no usb2 phy configured\n");
> 
> This nicely breaks all users.
> 
> NAK
> 

As per my comment in [patch 1/8], phy would be a required property and hence I will first modify
and enable EUD on the existing user (sc7280 SoC) and then extend this to other users.

Thanks
Elson