linux-kernel - Re: [PATCH v3 06/19] dt-bindings: usb: dwc3: Add a gpio-usb-connector description

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Date:   Tue, 4 Feb 2020 23:54:03 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        gregkh@...uxfoundation.org, jackp@...eaurora.org, balbi@...nel.org,
        bjorn.andersson@...aro.org, linux-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 06/19] dt-bindings: usb: dwc3: Add a gpio-usb-connector
 description

On 27/01/2020 18:43, Rob Herring wrote:
> On Wed, Jan 22, 2020 at 06:55:57PM +0000, Bryan O'Donoghue wrote:
>> A USB connector should be a child node of the USB controller
>> connector/usb-connector.txt. This patch adds a property
>> "gpio_usb_connector" which declares a connector child device. Code in the
>> DWC3 driver will then
>>
>> - Search for "gpio_usb_controller"
>> - Do an of_platform_populate() if found
>>
>> This will have the effect of making the declared node a child of the USB
>> controller and will make sure that USB role-switch events detected with the
>> gpio_usb_controller driver propagate into the DWC3 controller code
>> appropriately.
> 
> This is all driver specifics. This is a binding patch.
> 
>>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Cc: Rob Herring <robh+dt@...nel.org>
>> Cc: Mark Rutland <mark.rutland@....com>
>> Cc: linux-usb@...r.kernel.org
>> Cc: devicetree@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>> ---
>>   Documentation/devicetree/bindings/usb/dwc3.txt | 11 +++++++++++
>>   1 file changed, 11 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
>> index 66780a47ad85..b019bd472f83 100644
>> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
>> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
>> @@ -108,6 +108,9 @@ Optional properties:
>>   			When just one value, which means INCRX burst mode enabled. When
>>   			more than one value, which means undefined length INCR burst type
>>   			enabled. The values can be 1, 4, 8, 16, 32, 64, 128 and 256.
>> + - gpio_usb_connector: Declares a USB connector named 'gpio_usb_connector' as a
>> +		       child node of the DWC3 block. Use when modelling a USB
>> +		       connector based on the gpio-usb-b-connector driver.
> 
> Should be just 'connector'. That's already implicitly allowed for any
> USB controller, so you don't really need a binding change. And the
> specific type of connector is outside the scope of the DWC3 binding.
> 
>>   
>>    - in addition all properties from usb-xhci.txt from the current directory are
>>      supported as well
>> @@ -121,4 +124,12 @@ dwc3@...30000 {
>>   	interrupts = <0 92 4>
>>   	usb-phy = <&usb2_phy>, <&usb3,phy>;
>>   	snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
>> +	usb_con: gpio_usb_connector {
>> +		compatible = "gpio-usb-b-connector";
>> +		id-gpio = <&tlmm 116 GPIO_ACTIVE_HIGH>;
>> +		vbus-gpio = <&pms405_gpios 12 GPIO_ACTIVE_HIGH>;
> 
> *-gpios is the preferred form and should be what's documented.

Hi Rob,

If I've understood you right here you don't favour documenting a new 
binding but you're OK with adding an example ?

---
bod