On Thu, Jan 28, 2021 at 5:38 PM Alban Bedel [off-list ref] wrote:

From a quick glance at various datasheet the PCAL6524 seems to be the
only chip in this familly that support setting the drive mode of

chips
family

single pins. Other chips either don't support it at all, or can only
set the drive mode of whole banks, which doesn't map to the GPIO API.

Add a new flag, PCAL6524, to mark chips that have the extra registers
needed for this feature. Then mark the needed register banks as
readable and writable, here we don't set OUT_CONF as writable,
although it is, as we only need to read it. Finally add a function
that configure the OUT_INDCONF register when the GPIO API set the

configures
sets

drive mode of the pins.

Can we actually convert the driver to be a pin control for the starter?
Or split it for some chips to be a pin control, while the rest keeps
just being GPIO.
I would like to avoid more complex changes in it until it's properly
converted to the pin control.

-- 
With Best Regards,
Andy Shevchenko