[PATCH dev-5.0 1/2] dt-bindings: misc: aspeed-p2a-ctrl: add support

[Patrick Venture]

On Thu, Apr 25, 2019 at 11:16 AM Patrick Venture <venture at google.com> wrote:
>
> +OpenBMC Maillist
>
> On Thu, Apr 25, 2019 at 11:15 AM Patrick Venture <venture at google.com> wrote:
> >
> > Document the ast2400, ast2500 PCI-to-AHB bridge control driver bindings.
> >
> > Signed-off-by: Patrick Venture <venture at google.com>
> > Reviewed-by: Rob Herring <robh at kernel.org>
> > Reviewed-by: Andrew Jeffery <andrew at aj.id.au>
> > Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> > (cherry picked from commit 28703c6ef6228635f7c8b248c1d846511a2b60a3)
> > ---
> >  .../bindings/misc/aspeed-p2a-ctrl.txt         | 47 +++++++++++++++++++
> >  1 file changed, 47 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..854bd67ffec6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt
> > @@ -0,0 +1,47 @@
> > +======================================================================
> > +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"
> > +
> > +Optional properties:
> > +===================
> > +
> > +- memory-region: A phandle to a reserved_memory region to be used for the PCI
> > +               to AHB mapping
> > +
> > +The p2a-control node should be the child of a syscon node with the required
> > +property:
> > +
> > +- compatible : Should be one of the following:
> > +               "aspeed,ast2400-scu", "syscon", "simple-mfd"
> > +               "aspeed,g4-scu", "syscon", "simple-mfd"
> > +               "aspeed,ast2500-scu", "syscon", "simple-mfd"
> > +               "aspeed,g5-scu", "syscon", "simple-mfd"
> > +
> > +Example
> > +===================
> > +
> > +g4 Example
> > +----------
> > +
> > +syscon: scu at 1e6e2000 {
> > +       compatible = "aspeed,ast2400-scu", "syscon", "simple-mfd";
> > +       reg = <0x1e6e2000 0x1a8>;
> > +
> > +       p2a: p2a-control {
> > +               compatible = "aspeed,ast2400-p2a-ctrl";
> > +               memory-region = <&reserved_memory>;
> > +       };
> > +};
> > --
> > 2.21.0.593.g511ec345e18-goog
> >
>
> --suppress-cc=all really meant all.