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Date:   Mon, 11 Mar 2019 17:20:07 -0500
From:   Rob Herring <robh@...nel.org>
To:     Patrick Venture <venture@...gle.com>
Cc:     mark.rutland@....com, joel@....id.au, andrew@...id.au,
        gregkh@...uxfoundation.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/2] dt-bindings: misc: aspeed-p2a-ctrl: add support

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.

Rob



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