linux-kernel - Re: [PATCH 13/13] platform/raspberrypi: vchiq: Register vc-sm-cma as a platform driver

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Message-ID: <503ac2d6-2636-4e32-85d1-490f0fa5b5f9@kernel.org>
Date: Mon, 3 Nov 2025 15:01:36 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jai Luthra <jai.luthra@...asonboard.com>,
 Florian Fainelli <florian.fainelli@...adcom.com>,
 Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
 bcm-kernel-feedback-list@...adcom.com
Cc: Dave Stevenson <dave.stevenson@...pberrypi.com>,
 Phil Elwell <phil@...pberrypi.com>, Stefan Wahren <wahrenst@....net>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Kieran Bingham <kieran.bingham@...asonboard.com>,
 Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....com>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/13] platform/raspberrypi: vchiq: Register vc-sm-cma as
 a platform driver

On 03/11/2025 14:57, Jai Luthra wrote:
> Quoting Krzysztof Kozlowski (2025-11-02 15:03:55)
>> On 31/10/2025 18:27, Jai Luthra wrote:
>>> From: Dave Stevenson <dave.stevenson@...pberrypi.com>
>>>
>>> Register the vc-sm-cma driver as a platform driver under vchiq.
>>>
>>> Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
>>> Signed-off-by: Jai Luthra <jai.luthra@...asonboard.com>
>>> ---
>>>  drivers/platform/raspberrypi/vchiq-interface/vchiq_arm.c | 3 +++
>>>  1 file changed, 3 insertions(+)
>>>
>>> diff --git a/drivers/platform/raspberrypi/vchiq-interface/vchiq_arm.c b/drivers/platform/raspberrypi/vchiq-interface/vchiq_arm.c
>>> index 6a7b96d3dae6275a483ef15dc619c5510454765e..09d33bec46ec45175378fff8dd1084d0a8a12dd6 100644
>>> --- a/drivers/platform/raspberrypi/vchiq-interface/vchiq_arm.c
>>> +++ b/drivers/platform/raspberrypi/vchiq-interface/vchiq_arm.c
>>> @@ -63,6 +63,7 @@
>>>   * the interface.
>>>   */
>>>  static struct vchiq_device *bcm2835_audio;
>>> +static struct vchiq_device *vcsm_cma;
>>
>> Please don't write singletons. How do you handle probe of two devices?
> 
> This driver instantiates all the devices under the vchiq bus during its
> probe.
> 
> The VCHIQ firmware doesn't support device enumeration, hence we have to
> list out the supported devices here.


You did not answer the problem. So if you respond like this, then: fine,
instantiate as you wish but since it is in the probe, you still do not
need singleton.

NAK for the singleton pattern.

Best regards,
Krzysztof