linux-kernel - Re: [PATCH v2 2/4] arm64: dts: qcom: x1e80100: add bus topology for PCIe domain 3

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Message-ID: <aAt4TBrekUqyTjfi@hovoldconsulting.com>
Date: Fri, 25 Apr 2025 13:55:56 +0200
From: Johan Hovold <johan@...nel.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Wenbin Yao <quic_wenbyao@...cinc.com>, catalin.marinas@....com,
	will@...nel.org, linux-arm-kernel@...ts.infradead.org,
	andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, krishna.chundru@....qualcomm.com,
	quic_vbadigan@...cinc.com, quic_mrana@...cinc.com,
	quic_cang@...cinc.com, quic_qianyu@...cinc.com
Subject: Re: [PATCH v2 2/4] arm64: dts: qcom: x1e80100: add bus topology for
 PCIe domain 3

On Fri, Apr 25, 2025 at 12:22:56PM +0200, Konrad Dybcio wrote:
> On 4/25/25 11:29 AM, Wenbin Yao wrote:
> > From: Qiang Yu <quic_qianyu@...cinc.com>
> > 
> > Add pcie3port node to represent the PCIe bridge of PCIe3 so that PCI slot
> > voltage rails can be described under this node in the board's dts.
> > 
> > Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
> > Signed-off-by: Wenbin Yao <quic_wenbyao@...cinc.com>
> > ---
> >  arch/arm64/boot/dts/qcom/x1e80100.dtsi | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> > index 46b79fce9..430f9d567 100644
> > --- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> > @@ -3287,6 +3287,17 @@ opp-128000000 {
> >  					opp-peak-kBps = <15753000 1>;
> >  				};
> >  			};
> > +
> > +			pcie3port: pcie@0 {
> 
> @0,0 for PCIe adressing (bus,device)

No, the bus number is not included in the unit address, so just the
device number (0) is correct here (when the function is 0) IIUC.

Johan