linux-kernel - Re: [PATCH] dt-bindings: firmware: xilinx: Describe soc-vvmem subnode

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Date: Mon, 29 Jan 2024 16:57:35 +0000
From: Conor Dooley <conor@...nel.org>
To: Michal Simek <michal.simek@....com>
Cc: linux-kernel@...r.kernel.org, monstr@...str.eu, michal.simek@...inx.com,
	git@...inx.com, 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>,
	kishore Manne <nava.kishore.manne@....com>,
	"moderated list:ARM/ZYNQ ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] dt-bindings: firmware: xilinx: Describe soc-vvmem subnode

On Mon, Jan 29, 2024 at 01:25:06PM +0100, Michal Simek wrote:
> Describe soc-nvmem subnode as the part of firmware node. The name can't be
> pure nvmem because dt-schema already defines it as array property that's
> why different name should be used.
> 
> Signed-off-by: Michal Simek <michal.simek@....com>
> ---
> 
> Dt binding for nvmem node has been already merged and it is the part of
> linux-next tree.
> Here is the reference to it just in case:
> https://lore.kernel.org/r/170635581622.41421.8980881999042944764.b4-ty@linaro.org
> 
> ---
>  .../bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml   | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml
> index 7586fbff7ad6..108772ef574f 100644
> --- a/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml
> +++ b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml
> @@ -62,6 +62,12 @@ properties:
>        interface.
>      type: object
>  
> +  soc-nvmem:
> +    $ref: /schemas/nvmem/xlnx,zynqmp-nvmem.yaml#
> +    description: The ZynqMP MPSoC provides access to the hardware related data
> +      like SOC revision, IDCODE and specific purpose efuses.
> +    type: object
> +
>    pcap:
>      $ref: /schemas/fpga/xlnx,zynqmp-pcap-fpga.yaml
>      description: The ZynqMP SoC uses the PCAP (Processor Configuration Port) to
> @@ -110,6 +116,9 @@ examples:
>      firmware {
>        zynqmp_firmware: zynqmp-firmware {
>          #power-domain-cells = <1>;
> +        soc-nvmem {
> +          compatible = "xlnx,zynqmp-nvmem-fw";
> +        };

Would it not be better to have an actual nvmem-layout in here? The
~empty node here looks rather odd.

Also, there's a type in $subject of nvmem.

Thanks,
Conor.

>          gpio {
>            compatible = "xlnx,zynqmp-gpio-modepin";
>            gpio-controller;
> -- 
> 2.36.1
> 

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