linux-kernel - Re: [PATCH V3 6/6] dt-bindings: xen: Clarify "reg" purpose

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Date:   Sun, 28 Nov 2021 19:01:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Oleksandr Tyshchenko <olekstysh@...il.com>
Cc:     xen-devel@...ts.xenproject.org,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Julien Grall <julien@....org>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH V3 6/6] dt-bindings: xen: Clarify "reg" purpose

On Wed, 24 Nov 2021 22:53:43 +0200, Oleksandr Tyshchenko wrote:
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
> 
> Xen on Arm has gained new support recently to calculate and report
> extended regions (unused address space) safe to use for external
> mappings. These regions are reported via "reg" property under
> "hypervisor" node in the guest device-tree. As region 0 is reserved
> for grant table space (always present), the indexes for extended
> regions are 1...N.
> 
> No device-tree bindings update is needed (except clarifying the text)
> as guest infers the presence of extended regions from the number
> of regions in "reg" property.
> 
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
> ---
> According to the recent update to Xen's guest.txt:
> https://xenbits.xen.org/gitweb/?p=xen.git;a=blob_plain;f=docs/misc/arm/device-tree/guest.txt;hb=refs/heads/master
> 
> Changes V2 -> V3:
>    - new patch
> ---
>  Documentation/devicetree/bindings/arm/xen.txt | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 

Acked-by: Rob Herring <robh@...nel.org>