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 13:12, Sakari Ailus wrote:
> Hi Hans,
> 
> On Wed, Jul 01, 2026 at 01:01:58PM +0200, Hans de Goede wrote:
>> 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.
> 
> I do agree that having a constant name for the regulators would be
> beneficial for the int3472 driver. Still, if, and presumably, when that
> sensor gets DT support, the bindings will use the regulator name from the
> datasheet.
> 
> Let's just use the datasheet name now and add the few lines needed to the
> int3472 driver and avoid the churn in the future. There's a limited number
> of sensor drivers that need this after all.

Ok, if your happy with using "vana" + an int3472 quirk, that works
for me.

Regards,

Hans