Re: [PATCH v6 3/4] platform: int3472: discrete: con_id vana for Sony IMX471 as power enable

[Hans de Goede <hansg@kernel.org>]

Hi,

On 1-Jul-26 08:19, Tarang Raval wrote:
> Hi Hans,                                                                       
>                                                                                
>> On 30-Jun-26 09:32, Tarang Raval wrote:                                      
>>> Hi Kate,                                                                   
>>>                                                                            
>>>> Update the con_id for the Sony IMX471 sensor to "vana" to serve as the    
>>>> power enable. Additionally, the HID values SONY471A and TBE20A0, both     
>>>> associated with the IMX471 image sensor, have been identified on Lenovo   
>>>> laptops.                                                                  
>>>>                                                                           
>>>> Signed-off-by: Kate Hsuan <hpa@redhat.com>                                
>>>                                                                            
>>> Thanks, looks good.                                                        
>>>                                                                            
>>> Reviewed-by: Tarang Raval <tarang.raval@siliconsignals.io>                 
>>                                                                              
>> Hmm, the imx471 driver is still pending upstream:                            
>>                                                                              
>> https://lore.kernel.org/linux-media/20260629074026.35490-5-hpa@redhat.com/   
>>                                                                              
>> As part of this series.                                                      
>>                                                                              
>> Please just use the standardized "avdd" in that driver instead               
>> of "vana" (which also seems to refer to the analog supply vdd,               
>> which is what avdd stands for).                                              
>>                                                                              
>> Then this whole patch is unnecessary and can be dropped from                 
>> this series.                                                                 
>                                                                                
> The regulator name "vana" comes directly from the Sony IMX471 sensor           
> datasheet, which typically refers to the analog supply voltage. Using the      
> datasheet name helps keep the driver consistent with the hardware              
> documentation and makes it easier to cross-reference.                          
>                                                                                
> as per my understanding, the more standardized way is to use the regulator     
> name as per the sensor datasheet. Therefore, I respectfully disagree with 
> your suggestion.                                                           

As shown by the need for this patch on x86 at least because there
is no devicetree it greatly helps if all Linux sensor drivers use
standardized names for their regulators rather then using the exact name
from the datasheet which often is not very consistent.

And "avdd" is the name we've standardized on for this, so lets use that:

hans@shalem:~/projects/linux$ grep -l '"vana"' drivers/media/i2c/*.c | wc -l
4
hans@shalem:~/projects/linux$ grep -l '"avdd"' drivers/media/i2c/*.c | wc -l
36

The alternative is needing to add more and more quirks as different
sensors are used, which is not great.

Regards,

Hans