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

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Message-ID: <c002018d3765280e135d673f7c731784a90a260d.camel@kernel.crashing.org>
Date:   Wed, 12 Sep 2018 09:56:33 +0200
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Rob Herring <robh@...nel.org>,
        Eddie James <eajames@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, jdelvare@...e.com,
        linux-doc@...r.kernel.org, openbmc@...ts.ozlabs.org,
        gregkh@...uxfoundation.org, mark.rutland@....com,
        linux@...ck-us.net, joel@....id.au
Subject: Re: [PATCH v5 01/10] dt-bindings: fsi: Add P9 OCC device
 documentation

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@...ux.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
> >