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SubjectRe: [PATCH v4 1/2] dt-bindings: counter: add pulse-counter binding
On Thu, Jan 28, 2021 at 02:39:22PM +0100, Oleksij Rempel wrote:
> On Thu, Jan 28, 2021 at 09:17:23AM +0100, Linus Walleij wrote:
> > Hi Oleksij,
> >
> > thanks for your patch!
> >
> > On Tue, Jan 26, 2021 at 2:15 PM Oleksij Rempel <o.rempel@pengutronix.de> wrote:
> >
> > > Add binding for the pulse counter node
> > >
> > > Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> > (...)
> >
> > > +properties:
> > > + compatible:
> > > + const: virtual,pulse-counter
> >
> > What is so virtual about this? The device seems very real.
>
> Currently there are two ways:
> 1. use "virtual" or "linux" vendor. Same as "virtual,mdio-gpio"

virtual is used by exactly one case. linux for a few more, mostly
linux,spdif-dit and extcon (deprecated).

> 2. Extend the list of "not vendor" prefixes in the prefixes list:
> Documentation/devicetree/bindings/vendor-prefixes.yaml

Pretty sure that says 'DON'T ADD MORE'. Maybe I forgot to scream it.

>
> Since both ways seems to be valid, i personally prefer to use existing
> prefix instead of maintaining the vendor-prefixes.yaml
>
> @Rob, what do you prefer?

For vendorless bindings, no vendor prefix! 'gpio-counter' if only gpio
interfaced. No idea what other options would be.

>
> > However it is certainly a GPIO counter.
>
> This was my first implementation. @Jonathan you suggest to use GPIO-free
> way, can you and Linus please decide what is the way to go.
>
> I personally can imagine that this driver can be attached to any IRQ
> source, including drivers/iio/trigger/iio-trig-sysfs.c
>
> > I would call it "gpio-counter" simply.
> >
> > Define:
> > $nodename:
> > pattern: "^counter(@.*)?$"
> >
> > > + counter-0 {
> >
> > counter@0 {
> >
> > > + counter-1 {
> >
> > counter@1 {
>
> In this case the dtc compiler will say:
> /counter@0: node has a unit name, but no reg property

counter-0 then.

>
> Regards,
> Oleksij
> --
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