linux-kernel - Re: [PATCH v6 1/2] dt-bindings: misc: aspeed-p2a-ctrl: add support

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Message-ID: <CAL_Jsq+M2P8eEkwS9-mLXfoA3LC6K-_WHUns5sH75E6h6qC2fA@mail.gmail.com>
Date:   Mon, 11 Mar 2019 21:38:41 -0500
From:   Rob Herring <robh@...nel.org>
To:     Patrick Venture <venture@...gle.com>
Cc:     Mark Rutland <mark.rutland@....com>, Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Greg KH <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed@...ts.ozlabs.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/2] dt-bindings: misc: aspeed-p2a-ctrl: add support

On Mon, Mar 11, 2019 at 6:49 PM Patrick Venture <venture@...gle.com> wrote:
>
> On Mon, Mar 11, 2019 at 3:20 PM Rob Herring <robh@...nel.org> wrote:
> >
> > On Mon, Mar 04, 2019 at 10:55:36AM -0800, Patrick Venture wrote:
> > > Document the ast2400, ast2500 PCI-to-AHB bridge control driver bindings.
> > >
> > > Signed-off-by: Patrick Venture <venture@...gle.com>
> > > ---
> > > Changes for v6:
> > > - None
> > > Changes for v5:
> > > - None
> > > Changes for v4:
> > > - None
> > > Changes for v3:
> > > - None
> > > Changes for v2:
> > > - Added comment about syscon required parameter.
> > > ---
> > >  .../bindings/misc/aspeed-p2a-ctrl.txt         | 32 +++++++++++++++++++
> > >  1 file changed, 32 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt b/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt
> > > new file mode 100644
> > > index 000000000000..1092d62d1c92
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt
> > > @@ -0,0 +1,32 @@
> > > +======================================================================
> > > +Device tree bindings for Aspeed AST2400/AST2500 PCI-to-AHB Bridge Control Driver
> > > +======================================================================
> > > +
> > > +The bridge is available on platforms with the VGA enabled on the Aspeed device.
> > > +In this case, the host has access to a 64KiB window into all of the BMC's
> > > +memory.  The BMC can disable this bridge.  If the bridge is enabled, the host
> > > +has read access to all the regions of memory, however the host only has read
> > > +and write access depending on a register controlled by the BMC.
> > > +
> > > +Required properties:
> > > +===================
> > > +
> > > + - compatible: must be one of:
> > > +     - "aspeed,ast2400-p2a-ctrl"
> > > +     - "aspeed,ast2500-p2a-ctrl"
> > > +
> > > + - syscon: handle to syscon device node controlling PCI.
> > > +
> > > +Optional properties:
> > > +===================
> > > +
> > > +- memory-region: A phandle to a reserved_memory region to be used for the PCI
> > > +             to AHB mapping
> > > +
> > > +Example:
> > > +
> > > +p2a: p2a-control@...e2000 {
> > > +     compatible = "aspeed,ast2400-p2a-ctrl";
> > > +     memory-region = <&reserved_memory>;
> > > +     syscon = <&syscon>;
> >
> > Make this node a child of what you are pointing to instead if this the
> > only control interface.
>
> You're suggesting I make this a child of the syscon?

Yes.

Rob