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

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Message-ID: <b229ea9b-96c9-4910-a827-f4d9cc14fa96@broadcom.com>
Date: Wed, 3 Sep 2025 09:16:57 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Stefan Wahren <wahrenst@....net>, Jai Luthra
 <jai.luthra@...asonboard.com>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Umang Jain <uajain@...lia.com>,
 Dave Stevenson <dave.stevenson@...pberrypi.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
Subject: Re: [PATCH 1/5] include: linux: Destage VCHIQ interface headers

On 9/3/25 08:03, Stefan Wahren wrote:
> Am 03.09.25 um 15:48 schrieb Jai Luthra:
>> Hi Florian, Stefan,
>>
>> Quoting Stefan Wahren (2025-08-28 11:49:47)
>>> 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.
>> Thanks for the suggestions. For v2 I'll use:
>>
>> include/linux/soc/raspberrypi
>> drivers/soc/raspberrypi
> I'm fine with this.

Still is not properly name spaced IMHO. There is clearly a lot of cross 
pollination between Raspberry Pi and Broadcom on the BCM283x and BCM27xx 
SoCs, but ultimately, Broadcom makes the SoC and delivers it to 
Raspberry Pi.

I would really rather that you used drivers/platform/raspberrypi and 
include/linux/raspberrypi than the previously suggested paths.
-- 
Florian