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

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

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@quicinc.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@9200000 {
>>  			interrupts = <GIC_SPI 582 IRQ_TYPE_LEVEL_HIGH>;
>>  		};
>>  
>> +		usb_2: usb@a4f8800 {
>> +			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