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

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Date: Wed, 31 Jan 2024 10:09:24 +0100
From: Michal Simek <michal.simek@....com>
To: linux-kernel@...r.kernel.org, monstr@...str.eu, michal.simek@...inx.com,
 git@...inx.com
Cc: Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Rob Herring <robh+dt@...nel.org>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>,
 "moderated list:ARM/ZYNQ ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] dt-bindings: soc: xilinx: Add support for KV260 CC



On 1/23/24 15:23, 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(+)
> 
> diff --git a/Documentation/devicetree/bindings/soc/xilinx/xilinx.yaml b/Documentation/devicetree/bindings/soc/xilinx/xilinx.yaml
> index 7c75dbb4f307..131aba5ed9f4 100644
> --- a/Documentation/devicetree/bindings/soc/xilinx/xilinx.yaml
> +++ b/Documentation/devicetree/bindings/soc/xilinx/xilinx.yaml
> @@ -148,6 +148,40 @@ properties:
>             - contains:
>                 const: xlnx,zynqmp-smk-k26
>   
> +      - description: Xilinx Kria SOM KV260 revA/Y/Z
> +        minItems: 3
> +        items:
> +          enum:
> +            - xlnx,zynqmp-sk-kv260-revA
> +            - xlnx,zynqmp-sk-kv260-revY
> +            - xlnx,zynqmp-sk-kv260-revZ
> +            - xlnx,zynqmp-sk-kv260
> +            - xlnx,zynqmp
> +        allOf:
> +          - contains:
> +              const: xlnx,zynqmp-sk-kv260-revA
> +          - contains:
> +              const: xlnx,zynqmp-sk-kv260
> +          - contains:
> +              const: xlnx,zynqmp
> +
> +      - description: Xilinx Kria SOM KV260 rev2/1/B
> +        minItems: 3
> +        items:
> +          enum:
> +            - xlnx,zynqmp-sk-kv260-rev2
> +            - xlnx,zynqmp-sk-kv260-rev1
> +            - xlnx,zynqmp-sk-kv260-revB
> +            - xlnx,zynqmp-sk-kv260
> +            - xlnx,zynqmp
> +        allOf:
> +          - contains:
> +              const: xlnx,zynqmp-sk-kv260-revB
> +          - contains:
> +              const: xlnx,zynqmp-sk-kv260
> +          - contains:
> +              const: xlnx,zynqmp
> +
>         - description: AMD MicroBlaze V (QEMU)
>           items:
>             - const: qemu,mbv

Applied.
M