linux-kernel - Re: [PATCH v4 14/19] arm64: dts: mediatek: asurada: Enable PCIe and add WiFi

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Message-ID: <a58d5fa4-0d00-4ca1-941b-3ad69e65de80@notapiano>
Date: Mon, 6 Jan 2025 16:10:32 -0300
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	kernel@...labora.com, Chen-Yu Tsai <wenst@...omium.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v4 14/19] arm64: dts: mediatek: asurada: Enable PCIe and
 add WiFi

On Fri, Jan 03, 2025 at 03:14:46PM -0600, Bjorn Helgaas wrote:
> On Wed, Jun 29, 2022 at 11:59:51AM -0400, Nícolas F. R. A. Prado wrote:
> > Enable MT8192's PCIe controller and add support for the MT7921e WiFi
> > card that is present on that bus for the Asurada platform.
> 
> > +&pcie {
> > +	pinctrl-names = "default";
> > +	pinctrl-0 = <&pcie_pins>;
> > +
> > +	pcie0: pcie@0,0 {
> > +		device_type = "pci";
> > +		reg = <0x0000 0 0 0 0>;
> > +		num-lanes = <1>;
> > +		bus-range = <0x1 0x1>;
> 
> Hi Nícolas, what's the purpose of this bus-range?  IIUC this describes
> a Root Port, where we can read and configure the secondary/subordinate
> bus numbers from the RP config space, so it seems like we don't need
> to describe them here.

Hi Bjorn,

that was carried over from the downstream sources. I just tried removing it and
indeed I don't see any difference in the PCI log messages, or the bus number,
and the wifi works just fine. I can send a follow up patch removing it.

Thanks,
Nícolas