Re: [PATCH v5 01/10] dt-bindings: fsi: Add P9 OCC device documentation

Benjamin Herrenschmidt
2018-09-12T07:57:23Z

On Mon, 2018-09-10 at 13:16 -0500, Rob Herring wrote:
> On Thu, Aug 30, 2018 at 04:32:32PM -0500, Eddie James wrote:
> > Document the bindings for the FSI-attached POWER9 On-Chip Controller.
> >
> > Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com>
> > ---
> > Documentation/devicetree/bindings/fsi/ibm,p9-occ.txt | 15 +++++++++++++++
> > 1 file changed, 15 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/fsi/ibm,p9-occ.txt
> >
> > diff --git a/Documentation/devicetree/bindings/fsi/ibm,p9-occ.txt b/Documentation/devicetree/bindings/fsi/ibm,p9-occ.txt
> > new file mode 100644
> > index 0000000..46372f6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/fsi/ibm,p9-occ.txt
> > @@ -0,0 +1,15 @@
> > +Device-tree bindings for FSI-attached POWER9 On-Chip Controller (OCC)
> > +---------------------------------------------------------------------
> > +
> > +This is the binding for the P9 On-Chip Controller accessed over FSI from a
> > +service processor. See fsi.txt for details on bindings for FSI slave and CFAM
> > +nodes.
> > +
> > +Required properties:
> > + - compatible = "ibm,p9-occ"
> > +
> > +Examples:
> > +
> > + occ {
>
> FSI slave devices are supposed to have an address according to the
> binding doc.

This isn't the FSI device per-se actually. This is a node below the
"sbefifo" FSI device. The SBE fifo is the mechanism by which we
communicate with the OCC. The sbefifo doesn't really define a "bus",
it's mostly used from userspace directly via /dev/sbefifo* to perform
various tasks in the chip, but it happens to also provide the in-kernel
transport for the OCC commands.

Cheers,
Ben.

> > + compatible = "ibm,p9-occ";
> > + };
> > --
> > 1.8.3.1
> >