RE: [PATCH v4 1/2] pinctrl: Add RZ/A2 pin and gpio controller

[Chris Brandt <Chris.Brandt@xxxxxxxxxxx>]

Hi Geert,

On Tuesday, November 13, 2018, Geert Uytterhoeven wrote:
> > It makes the files show up under /sys look nice.
> >
> > For example, P5_6 is button SW4:
> >
> >  $ echo 912 > /sys/class/gpio/export
> >
> > Then you end up with "/sys/class/gpio/P5_6/"
> >
> >  $ echo in > /sys/class/gpio/P5_6/direction
> >  $ cat /sys/class/gpio/P5_6/direction
> >  $ cat /sys/class/gpio/P5_6/value
> 
> (Ah, the legacy and deprecated sysfs GPIO interface, being replaced
>  by /dev/gpiochip[0-9]+ and https://github.com/brgl/libgpiod)
> 
> Cool, I didn't know that.
> But you still need to know which number to write to the export file
> in the first place?

True, meaning the table does not help you as much as you want.
Jacopo also mentioned the new libgpiod.
So, I think I might just drop this table in the next revision.

What I really want to do is just say "make P5_6 an input" and
not have to convert to a global ID number. But, I'm not sure how
libgpiod is going to know what "P5_6" is.


> > > Some people prefer "reverse Xmas tree ordering" i.e. sorted by
> decreasing
> > > declaration length.
> >
> > https://lwn.net/Articles/758552/
> >
> > "only a few maintainers insist on that, while most really do not care or
> > think that it's actively silly."
> >
> > So are you one of those maintainers?????   :)
> 
> Sorry, got baptised by Laurent...

 (insert picture of Laurent handing out Kool-Aid here)


Chris