linux-kernel - Re: [PATCH v3 06/25] docs: Xen ARM DT bindings

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Date:	Mon, 27 Aug 2012 18:03:52 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	linaro-dev@...ts.linaro.org, Ian.Campbell@...rix.com,
	arnd@...db.de, konrad.wilk@...cle.com, catalin.marinas@....com,
	devicetree-discuss@...ts.ozlabs.org, tim@....org,
	David Vrabel <david.vrabel@...rix.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 06/25] docs: Xen ARM DT bindings

On 08/16/2012 10:35 AM, Stefano Stabellini wrote:
> Add a doc to describe the Xen ARM device tree bindings
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> CC: devicetree-discuss@...ts.ozlabs.org
> CC: David Vrabel <david.vrabel@...rix.com>
> ---
>  Documentation/devicetree/bindings/arm/xen.txt |   22 ++++++++++++++++++++++
>  1 files changed, 22 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/arm/xen.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/xen.txt b/Documentation/devicetree/bindings/arm/xen.txt
> new file mode 100644
> index 0000000..ec6d884
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/xen.txt
> @@ -0,0 +1,22 @@
> +* Xen hypervisor device tree bindings
> +
> +Xen ARM virtual platforms shall have the following properties:
> +
> +- compatible:
> +	compatible = "xen,xen", "xen,xen-<version>";
> +  where <version> is the version of the Xen ABI of the platform.
> +
> +- reg: specifies the base physical address and size of a region in
> +  memory where the grant table should be mapped to, using an
> +  HYPERVISOR_memory_op hypercall. 
> +
> +- interrupts: the interrupt used by Xen to inject event notifications.

You should look at ePAPR 1.1 which defines hypervisor related bindings.
While it is a PPC doc, we should reuse or extend what makes sense.

See section 7.5:

https://www.power.org/resources/downloads/Power_ePAPR_APPROVED_v1.1.pdf

Rob

> +
> +
> +Example:
> +
> +hypervisor {
> +	compatible = "xen,xen", "xen,xen-4.3";
> +	reg = <0xb0000000 0x20000>;
> +	interrupts = <1 15 0xf08>;
> +};
> 

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