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

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Message-ID: <7bfb3ebc-2e8b-4fcc-8d13-a6f3e0b7141e@nvidia.com>
Date: Mon, 5 Jan 2026 11:56:37 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Niklas Cassel <cassel@...nel.org>, Manivannan Sadhasivam <mani@...nel.org>
Cc: 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 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 ...

Acked-by: Jon Hunter <jonathanh@...dia.com>

Thanks!
Jon

-- 
nvpublic