[PATCH 2/4] dt-bindings: display: bcm2835-v3d: Add an optional reset line

[Maíra Canal]

On 03/09/26 16:38, Florian Fainelli wrote:
> On 8/18/26 03:35, Maíra Canal wrote:
>> Hi Krzysztof,
>>
>> On 18/08/26 06:05, Krzysztof Kozlowski wrote:
>>> On Sun, Aug 16, 2026 at 11:05:41AM -0300, Maíra Canal wrote:
>>>> The BCM2835 PM block has exposed a reset line for the V3D block since
>>>> commit 670c672608a1 ("soc: bcm: bcm2835-pm: Add support for power 
>>>> domains
>>>
>>> This is a reset provider driver, so not really relevant here. Driver
>>> commit would be relevant if it was about consumer who implemented
>>> undocumented ABI. I suggest to drop reference to driver and instead
>>> describe the hardware.
>>
>> Ack.
>>
>>>
>>>> under a new binding."), which allows the GPU to be reset without
>>>> power-cycling its domain. Document it so that the vc4 driver can use 
>>>> it to
>>>> recover from a GPU hang.
>>>
>>> Does every device have it? Cygnus as well?
>>
>> I'm not familiar to the Cygnus hardware, only Raspberry Pi, so I'd
>> appreciate if one of the folks from Broadcom could help us with this
>> information.
>>
>> However, just like the power domain, I added this property as optional
>> to accommodate the fact that the current Cygnus DT doesn't expose any
>> power domain or reset controller.
> 
> I really don't know and have no visibility into these older chips, let's 
> assume they don't.

Considering Florian's feedback, what would you suggest, Krzysztof?
Should I document that not all devices have a reset line?

Best regards,
- Maíra