linux-kernel - Re: [RFC 6/9] dt-bindings: vendor-prefixes: add a PCI prefix for Qualcomm Atheros

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Date: Tue, 9 Jan 2024 10:17:38 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Rob Herring <robh@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>
Cc: Kalle Valo <kvalo@...nel.org>, "David S . Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Heiko Stuebner <heiko@...ech.de>,
 Jernej Skrabec <jernej.skrabec@...il.com>,
 Chris Morgan <macromorgan@...mail.com>,
 Linus Walleij <linus.walleij@...aro.org>,
 Geert Uytterhoeven <geert+renesas@...der.be>, Arnd Bergmann <arnd@...db.de>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Nícolas F . R . A . Prado <nfraprado@...labora.com>,
 Marek Szyprowski <m.szyprowski@...sung.com>, Peng Fan <peng.fan@....com>,
 Robert Richter <rrichter@....com>, Dan Williams <dan.j.williams@...el.com>,
 Terry Bowman <terry.bowman@....com>,
 Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Huacai Chen <chenhuacai@...nel.org>, Alex Elder <elder@...aro.org>,
 Srini Kandagatla <srinivas.kandagatla@...aro.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-pci@...r.kernel.org,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [RFC 6/9] dt-bindings: vendor-prefixes: add a PCI prefix for
 Qualcomm Atheros

On 09/01/2024 03:56, Rob Herring wrote:
> On Mon, Jan 8, 2024 at 12:22 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>>
>> On Mon, Jan 8, 2024 at 8:10 PM Rob Herring <robh@...nel.org> wrote:
>>>
>>> On Thu, Jan 04, 2024 at 02:01:20PM +0100, Bartosz Golaszewski wrote:
>>>> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>>>>
>>>> Document the PCI vendor prefix for Qualcomm Atheros so that we can
>>>> define the QCA PCI devices on device tree.
>>>
>>> Why? vendor-prefixes.yaml is only applied to property names. 'qca'
>>> should be the prefix for those.
>>>
>>> Rob
>>
>> I didn't have any better idea. PCI devices on DT are defined by their
>> "pci<vendor ID>,<model ID>" compatible, not regular human-readable
>> strings and this makes checkpatch.pl complain.
>>
>> I'm open to suggestions.
> 
> The checkpatch.pl check predates schemas and we could consider just
> dropping it. The only thing it provides is checking a patch rather
> than the tree (which the schema do). It's pretty hacky because it just
> greps the tree for a compatible string which is not entirely accurate.
> Also, we can extract an exact list of compatibles with
> "dt-extract-compatibles" which would make a better check, but I'm not
> sure making dtschema a dependency on checkpatch would be good.
> 
> The other option is just ignore the warning. PCI compatibles are fairly rare.

Yep, the same warnings are for EEPROM and USB VID/PID compatibles, and
we live with these, so I don't think PCI should be treated differently.

Best regards,
Krzysztof