Re: Question about nct6775 regarding MFD

[Niedermayr, BENEDIKT]

On 16.06.25 14:14, Guenter Roeck wrote:
> On 6/16/25 03:34, Niedermayr, BENEDIKT wrote:
>> Hi folks,
>>
>> we are currently refactoring some parts of the
>> "drivers/platform/x86/siemens/*" which has references to some
>>
>> Nuvoton Super-I/O chips. One of them is the nct6775.
>>
>> The driver in question is not implemented as MFD, even though MFD would
>> have fit perfectly for it (or am I wrong?).
>>
>>
>> My question now:
>>
>> Why wasn't the driver implemented as an MFD? Was MFD discussed during
>> your upstreaming-related conversations?
>>
> 
> Super-IO chips have historically not been implemented as MFD since the 
> functionality
> is well separated except for configuration register access, and that is 
> well handled
> with the various superio_enter() functions which use a multiplexed 
> memory region
> to (temporarily) request chip access. Implementing those drivers as MFD 
> would only
> add complexity with no gain or benefit.
> 
> Guenter
> 

Hi Guenter,

thanks for the quick response.

Made it clear to me!


Regards,
Benedikt