Re: [PATCH 1/6] mfd: Add Delta TN48M CPLD driver

[Michael Walle]

Hi,

Am 2021-05-19 13:53, schrieb Robert Marko:
> On Thu, May 6, 2021 at 6:34 PM Michael Walle <michael@xxxxxxxx> wrote:
> > Am 2021-04-30 14:35, schrieb Robert Marko:
> > > Delta TN48M switches have a Lattice CPLD that serves
> > > multiple purposes including being a GPIO expander.
> > > So lets add the MFD core driver for it.
> >
> > Did you have a look at mfd/simple-mfd-i2c.c?
>
> Yes, that was my first idea but we have a requirement to expose CPLD
> information via debugfs as there are userspace applications using it.
> And simple-mfd-i2c does not allow us to do so.

Mh, last time Lee wasn't very fond of having a driver that just 
populates
sub-drivers while doing almost nothing itself. See
https://lore.kernel.org/lkml/20200605065709.GD3714@dell/

That being said, I'd also like to expose our CPLD version, but until now
haven't found a good solution.

-michael