linux-kernel - Re: [PATCH 1/5] include: linux: Destage VCHIQ interface headers

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Message-ID: <c35ab51a-e9df-48f5-bc18-889980098d08@gmx.net>
Date: Thu, 28 Aug 2025 08:19:47 +0200
From: Stefan Wahren <wahrenst@....net>
To: Florian Fainelli <florian.fainelli@...adcom.com>,
 Umang Jain <uajain@...lia.com>, Jai Luthra <jai.luthra@...asonboard.com>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Ray Jui
 <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
 linux-rpi-kernel@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
 kernel-list@...pberrypi.com, Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: Re: [PATCH 1/5] include: linux: Destage VCHIQ interface headers

Hi Florian,

Am 28.08.25 um 04:17 schrieb Florian Fainelli:
>
>
> On 8/27/2025 12:05 PM, Stefan Wahren wrote:
>> Hi,
>>
>> Am 27.08.25 um 16:33 schrieb Umang Jain:
>>> On Wed, Aug 27, 2025 at 02:40:16PM +0200, Laurent Pinchart wrote:
>>>> Hi Jai,
>>>>
>>>> Thank you for the patch.
>>>>
>>>> On Wed, Aug 27, 2025 at 11:54:08AM +0530, Jai Luthra wrote:
>>>>> From: Umang Jain <umang.jain@...asonboard.com>
>>>>>
>>>>> Move the VCHIQ headers from drivers/staging/vc04_services/include to
>>>>> include/linux/vchiq
>>>>>
>>>>> This is done so that they can be shared between the VCHIQ interface
>>>>> (which is going to be de-staged in a subsequent commit from staging)
>>>>> and the VCHIQ drivers left in the staging/vc04_services (namely
>>>>> bcm2835-audio, bcm2835-camera).
>>>>>
>>>>> The include/linux/vchiq/ provides a central location to serve both
>>>>> of these areas.
>>>> Lots of SoC-specific headers are stored in include/linux/soc/$vendor/.
>>>> This would be include/linux/soc/bcm/vchiq/ in this case. I'm also fine
>>>> with include/linux/vchiq/ but other people may have a preference.
>>> I agree with this point and I might have missed to notice the
>>> include/linux/soc earlier. That's seems a better location to me since
>>> it's actually broadcom-specific.
>> I would expect that headers and source would be more related.
>>
>> For example:
>>
>> include/linux/soc/bcm
>>
>> drivers/soc/bcm/
>
> This is not Broadcom code, it is Raspberry Pi AFAICT, therefore, just 
> like drivers/firmware/raspberrypi.c, we would need some namespacing 
> here that reflects that, ideally.
The VCHIQ code originally comes from Broadcom, but the current 
implementation has been adapted and tested for Raspberry Pi. I'm not 
against a Raspberry Pi specific namespace.

Should this also apply to the DT bindings?

Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-vchiq.yaml

Best regards