[PATCH v10 1/2] dt-bindings: misc: aspeed-p2a-ctrl: add support

[Andrew Jeffery]

On Tue, 9 Apr 2019, at 00:12, Patrick Venture 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>

> ---
> Changes for v10:
>  - Chopped out nearly identical information.
> Changes for v9:
>  - Added missing details about syscon parent
> Changes for v8:
> - None
> Changes for v7:
> - Moved node under the syscon node it requires
> 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         | 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 0000000000000..854bd67ffec68
> --- /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>;
> +	};
> +};
> -- 
> 2.21.0.392.gf8f6787159e-goog
> 
>