linux-kernel - Re: [PATCHv2 1/2] dt-bindings: usb: dwc2: add support for STM32MP15 SoCs USB OTG HS and FS

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Date:   Fri, 17 Jan 2020 16:24:49 +0100
From:   Amelie DELAUNAY <amelie.delaunay@...com>
To:     Rob Herring <robh@...nel.org>
CC:     Minas Harutyunyan <hminas@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Fabrice Gasnier <fabrice.gasnier@...com>,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: Re: [PATCHv2 1/2] dt-bindings: usb: dwc2: add support for STM32MP15
 SoCs USB OTG HS and FS

On 1/17/20 3:48 PM, Rob Herring wrote:
> On Thu, Jan 16, 2020 at 03:45:23PM +0100, Amelie Delaunay wrote:
>> Add the specific compatible string for the DWC2 IP found in the STM32MP15
>> SoCs.
>> STM32MP15 SoCs uses sensing comparators to detect Vbus valid levels and
>> ID pin state. usb33d-supply described the regulator supplying Vbus and ID
>> sensing comparators.
>>
>> Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
>> ---
>>   Documentation/devicetree/bindings/usb/dwc2.yaml | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/dwc2.yaml b/Documentation/devicetree/bindings/usb/dwc2.yaml
>> index 71cf7ba32237..0b86250b97a9 100644
>> --- a/Documentation/devicetree/bindings/usb/dwc2.yaml
>> +++ b/Documentation/devicetree/bindings/usb/dwc2.yaml
>> @@ -58,6 +58,8 @@ properties:
>>         - const: st,stm32f4x9-fsotg
>>         - const: st,stm32f4x9-hsotg
>>         - const: st,stm32f7-hsotg
>> +      - const: st,stm32mp15-fsotg
>> +      - const: st,stm32mp15-hsotg
>>         - const: samsung,s3c6400-hsotg
>>   
>>     reg:
>> @@ -103,6 +105,10 @@ properties:
>>     vusb_a-supply:
>>       description: phandle to voltage regulator of analog section.
>>   
>> +  vusb33d_supply:
> 
> Not a valid regulator property.
> 

arrgh, was ok in the v1 in .txt. Will send a v3 fixing it with 
vusb33d-supply instead.

>> +    description: reference to the external VBUS and ID sensing comparators, in
>> +      order to perform OTG operation, used on STM32MP15 SoCs.
> 
> Are they external or part of the SoC? When we have Vbus sense and ID
> GPIOs, those go in the connector node, so this probably should too if
> these are board components.
> 

Yes, they are part of the SoC but external of the DWC2 IP. You can find 
them in the box "3V3 USB Detector" of PWR block diagram of STM32MP15x 
[1]. In OTG block diagram also, it corresponds to "OTG detection" box.
Behind this vusb33d supply, it is a regulator provided by PWR regulator 
driver. Maybe I should say "reference to the VBUS and ID sensing 
comparators *supply*.

[1] 
https://www.st.com/content/ccc/resource/technical/document/reference_manual/group0/51/ba/9e/5e/78/5b/4b/dd/DM00327659/files/DM00327659.pdf/jcr:content/translations/en.DM00327659.pdf

Regards,
Amelie

> Rob
>