linux-kernel - Re: [PATCH 2/2] PCI: dwc: Add multi-port controller support

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Message-ID: <aVzvANWTavhabhEB@ryzen>
Date: Tue, 6 Jan 2026 12:16:16 +0100
From: Niklas Cassel <cassel@...nel.org>
To: Manivannan Sadhasivam <mani@...nel.org>
Cc: Sumit Kumar <sumit.kumar@....qualcomm.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Yue Wang <yue.wang@...ogic.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
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	Chuanhua Lei <lchuanhua@...linear.com>,
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	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Pratyush Anand <pratyush.anand@...il.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, imx@...ts.linux.dev,
	linux-amlogic@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org, linux-tegra@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 2/2] PCI: dwc: Add multi-port controller support

On Tue, Jan 06, 2026 at 11:55:46AM +0100, Niklas Cassel wrote:
> For iterating, to avoid manually traversing the array, we could do like
> libata and create a simple macro, e.g. ata_qc_for_each():
> https://github.com/torvalds/linux/blob/v6.19-rc4/drivers/ata/libata-eh.c#L851-L854
> https://github.com/torvalds/linux/blob/v6.19-rc4/include/linux/libata.h#L1657-L1659
> 
> And at least personally, I think my brain will parse dw_pcie_port_for_each() { }
> faster than it parses list_for_each_entry(port, &pcie->ports, list) { },
> since it is more unique, but perhaps I am the weird one here :)

Or... for_each_dw_pcie_port()

We also don't need to supply an integer to the macro, we could do like e.g.
for_each_nhlt_endpoint():
https://github.com/torvalds/linux/blob/v6.19-rc4/include/acpi/nhlt.h#L63-L64

which has does "for (unsigned int __i = 0; " in the macro.


Kind regards,
Niklas