linux-kernel - Re: [PATCH v13 08/10] arm64: dts: qcom: sc8280xp: Add multiport controller node for SC8280

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Message-ID: <44b485a0-e8ff-4263-8762-04e11977ab18@linaro.org>
Date:   Mon, 23 Oct 2023 19:16:04 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Johan Hovold <johan@...nel.org>,
        Krishna Kurapati <quic_kriskura@...cinc.com>
Cc:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        quic_pkondeti@...cinc.com, quic_ppratap@...cinc.com,
        quic_jackp@...cinc.com, ahalaney@...hat.com,
        quic_shazhuss@...cinc.com
Subject: Re: [PATCH v13 08/10] arm64: dts: qcom: sc8280xp: Add multiport
 controller node for SC8280

On 23/10/2023 18:09, Johan Hovold wrote:
> On Sat, Oct 07, 2023 at 09:18:04PM +0530, Krishna Kurapati wrote:
>> Add USB and DWC3 node for tertiary port of SC8280 along with multiport
>> IRQ's and phy's. This will be used as a base for SA8295P and SA8295-Ride
>> platforms.
>>
>> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
>> ---
>>  arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 84 ++++++++++++++++++++++++++
>>  1 file changed, 84 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
>> index cad59af7ccef..5f64f75b07db 100644
>> --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
>> @@ -3330,6 +3330,90 @@ system-cache-controller@...0000 {
>>  			interrupts = <GIC_SPI 582 IRQ_TYPE_LEVEL_HIGH>;
>>  		};
>>  
>> +		usb_2: usb@...8800 {
>> +			compatible = "qcom,sc8280xp-dwc3-mp", "qcom,dwc3";
> 
> So you went with a dedicated compatible even though you are now
> inferring the number of ports from the interrupts property.
> 
> Should we drop that compatible again or is there any other reason to
> keep a separate one?

Please keep the dedicated compatible even if currently it is not used.
https://elixir.bootlin.com/linux/v6.1-rc1/source/Documentation/devicetree/bindings/writing-bindings.rst#L42

Best regards,
Krzysztof