On Mon, 3 Aug 2020 20:01:06 -0600 Rob Herring <robh+dt@xxxxxxxxxx> wrote: > On Mon, Aug 3, 2020 at 1:00 PM Stephen Boyd <swboyd@xxxxxxxxxxxx> wrote: > > > > Quoting Jonathan Cameron (2020-08-01 08:06:39) > > > On Fri, 31 Jul 2020 10:48:38 -0600 > > > Daniel Campello <campello@xxxxxxxxxxxx> wrote: > > > > diff --git a/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml b/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml > > > > new file mode 100644 > > > > index 00000000000000..5739074d3592fe > > > > --- /dev/null > > > > +++ b/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml > > > > @@ -0,0 +1,65 @@ > > [...] > > > > + > > > > + "#io-channel-cells": > > > > + const: 1 > > > > + > > > > +required: > > > > + - compatible > > > > + - reg > > > > + - "#io-channel-cells" > > > > > > Missed this in earlier review (only noticed when I saw whilst santity > > > checking earlier versions. > > > > > > Fairly sure we should only need #io-channel-cells if we have > > > a consumer of a channel somewhere else in DT. So it's not > > > required as far as I can see. > > > > > > > This is mostly a decision for Rob to make, but I would make it required > > because the device is always an io channel provider. It may be that it > > isn't providing anything in the DT to something else in the DT but it is > > providing this information somewhere so always having to spell that out > > is simple and doesn't hurt. > > I agree. If the user is split in a board file or overlay, we don't > want to have to be adding it to the provider at that time. That is perhaps a reasonable view point for devices with channels that are likely to be used by consumer drivers, but in this particular case we are talking about a proximity sensor. So far I don't think we have any consumer drivers for this type of sensor (I might have forgotten one of course!) I'm not that fussed though, so will leave it in. The argument is a lot stronger for ADCs and such like, so we can start encouraging it for those. Jonathan > > Rob
