linux-kernel - Re: [PATCH] dt-bindings: soc: xilinx: Add support for KV260 CC

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Message-ID: <170664786216.2319402.12093555371732757149.robh@kernel.org>
Date: Tue, 30 Jan 2024 14:51:02 -0600
From: Rob Herring <robh@...nel.org>
To: Michal Simek <michal.simek@....com>
Cc: michal.simek@...inx.com,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, git@...inx.com,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>, monstr@...str.eu,
	"moderated list:ARM/ZYNQ ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: soc: xilinx: Add support for KV260 CC


On Tue, 23 Jan 2024 15:23:08 +0100, Michal Simek wrote:
> When DT overlay is applied at run time compatible string or model AFAIK is
> not updated. But when fdtoverlay tool is used it actually creates full
> description for used SOM and carrier card(CC). That's why there is no
> reason to use generic SOM name and its compatible strings because they are
> not properly reflected in newly created DT.
> Composing dt overlays together was introduced by commit 7a4c31ee877a
> ("arm64: zynqmp: Add support for Xilinx Kria SOM board") and later renamed
> by commit 45fe0dc4ea2e ("arm64: xilinx: Use zynqmp prefix for SOM dt
> overlays").
> DTB selection is done prior booting OS that's why there is no need to do
> run time composition for SOM and CC combination. And user space can use
> compatible string and all listed revisions to figured it out which SOM and
> CC combinations OS is running at.
> 
> Signed-off-by: Michal Simek <michal.simek@....com>
> ---
> 
> We are using U-Boot DTB reselection feature to identify SOM + CC
> combination.
> 
> This patch depends on
> https://lore.kernel.org/r/90e1a393154c3d87e8ee7dc9eef07fc937c1eaf7.1706019397.git.michal.simek@amd.com
> 
> ---
>  .../bindings/soc/xilinx/xilinx.yaml           | 34 +++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 

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