linux-kernel - Re: [PATCH] pci: controller: tegra194: remove dependency on Tegra194 SoC

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Message-ID: <r7gwgljfg4mes5bb4bzyty4jivpmerbe34hqauofblhfvfbxia@4xxjv6m2o3i7>
Date: Mon, 5 Jan 2026 17:47:53 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Niklas Cassel <cassel@...nel.org>
Cc: Jon Hunter <jonathanh@...dia.com>, 
	Francesco Lavra <flavra@...libre.com>, thierry.reding@...il.com, 
	Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kwilczynski@...nel.org>, 
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Mayank Rana <mayank.rana@....qualcomm.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Shradha Todi <shradha.t@...sung.com>, Thippeswamy Havalige <thippeswamy.havalige@....com>, 
	Inochi Amaoto <inochiama@...il.com>, Vidya Sagar <vidyas@...dia.com>, linux-pci@...r.kernel.org, 
	linux-kernel@...r.kernel.org, "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH] pci: controller: tegra194: remove dependency on Tegra194
 SoC

On Mon, Jan 05, 2026 at 01:13:55PM +0100, Niklas Cassel wrote:
> On Mon, Jan 05, 2026 at 05:38:34PM +0530, Manivannan Sadhasivam wrote:
> > On Mon, Jan 05, 2026 at 11:56:37AM +0000, Jon Hunter wrote:
> > > 
> > > 
> > > On 05/01/2026 09:09, Niklas Cassel wrote:
> > > > On Mon, Jan 05, 2026 at 02:09:34PM +0530, Manivannan Sadhasivam wrote:
> > > > > On Fri, Jan 02, 2026 at 10:58:15AM +0000, Jon Hunter wrote:
> > > > > > 
> > > > > > On 23/12/2025 06:45, Manivannan Sadhasivam wrote:
> > > > > > > On Wed, Nov 26, 2025 at 11:25:30AM +0100, Francesco Lavra wrote:
> > > > > > > 
> > > > > > > + Tegra maintainers
> > > > > > > 
> > > > > > > > This driver runs (for both host and endpoint operation) also on other Tegra
> > > > > > > > SoCs (e.g. Tegra234).
> > > > > > > > Replace the Kconfig dependency on ARCH_TEGRA_194_SOC with a more generic
> > > > > > > > dependency on ARCH_TEGRA; in addition, amend the Kconfig help text to
> > > > > > > > reflect the fact that this driver is no longer exclusive to Tegra194.
> > > > > > > > 
> > > > > > > 
> > > > > > > I vaguely remember asking about this a while back during some other patch review
> > > > > > > and I don't remember what we concluded.
> > > > > > > > Thierry, Jon, thoughts?
> > > > > > 
> > > > > > So ARCH_TEGRA means that this can be enabled for the legacy 32-bit Tegra
> > > > > > devices as well as the current 64-bit Tegra devices (such as Tegra194).
> > > > > > Given that this driver is only used for Tegra194 and Tegra234, it seems it
> > > > > > would be better to only enable this for Tegra194 and Tegra234 instead of any
> > > > > > Tegra.
> > > > > > 
> > > > > 
> > > > > The dependency means, whenever someone tries to enable PCIE_TEGRA194_HOST,
> > > > > ARCH_TEGRA should be enabled. So as long as someone not trying to enable
> > > > > PCIE_TEGRA194_HOST for 32bit Tegra systems, ARCH_TEGRA should work fine and
> > > > > PCIE_TEGRA194_HOST is not selected by arch/arm/configs/tegra_defconfig. So I
> > > > > don't see any blocker with this patch. In fact, many other archs do the same.
> > > > > 
> > > > > But I don't like extending the Kconfig with per SoC dependency as it won't
> > > > > scale.
> > > > 
> > > > We already have a patch from Vidya:
> > > > [PATCH V4] PCI: dwc: tegra194: Broaden architecture dependency
> > > > that was sent 2025-05-08
> > > > 
> > > > Back then, the reason why it wasn't merged was because it required a
> > > > similar change to the PHY driver to go in first:
> > > > https://lore.kernel.org/linux-pci/174722268141.85510.14696275121588719556.b4-ty@kernel.org/
> > > > 
> > > > The PHY driver change was merged in v6.16:
> > > > 0c2228731974 ("phy: tegra: p2u: Broaden architecture dependency")
> > > > 
> > > > So, I think we could just merge:
> > > > https://lore.kernel.org/linux-pci/20250508051922.4134041-1-vidyas@nvidia.com/
> > > > 
> > > > (Assuming it still applies.)
> > > 
> > > Yes it does and applying Sagar's patch is fine with me. So it you want to
> > > apply Sagar's patch please add my ...
> > > 
> > 
> > Don't we need:
> > 
> > 	depends on (ARCH_TEGRA && ARM64) || COMPILE_TEST
> 
> This is exactly what I originally suggested to Vidya:
> https://lore.kernel.org/linux-pci/Z6XjWJd9jm0HHNXW@ryzen/
> 

Ah, I didn't notice your reply, as well as mine at that time :)

> 
> > 
> > in the above patch?
> 
> The above patch instead has:
> 
> depends on ARCH_TEGRA && (ARM64 || COMPILE_TEST)
> 
> I don't know why Vidya did not use my suggestion exactly, but I guess I
> assumed that he had a reason not to use my suggestion exactly.
> 

Maybe it got missed? If Jon could confirm, I'll make the change and apply it.

- Mani

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