linux-kernel - Re: [PATCH v2] dt-bindings: firmware: xilinx: Describe soc-nvmem subnode

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Date: Wed, 31 Jan 2024 15:34:30 +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 v2] dt-bindings: firmware: xilinx: Describe soc-nvmem
 subnode

On Wed, Jan 31, 2024 at 10:17:28AM +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>

Acked-by: Conor Dooley <conor.dooley@...rochip.com>

Cheers,
Conor.

> ---
> 
> Changes in v2:
> - Fix typo in subject
> - Make example bigger requested by Conor
> 
> 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
> 
> v1 available here:
> https://lore.kernel.org/r/3869498c995cbb123127122f429e90de0a3f4014.1706531104.git.michal.simek@amd.com
> 
> ---
>  .../firmware/xilinx/xlnx,zynqmp-firmware.yaml  | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml
> index 870b94813a43..741f17c830f4 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 +116,18 @@ examples:
>      firmware {
>        zynqmp_firmware: zynqmp-firmware {
>          #power-domain-cells = <1>;
> +        soc-nvmem {
> +          compatible = "xlnx,zynqmp-nvmem-fw";
> +          nvmem-layout {
> +            compatible = "fixed-layout";
> +            #address-cells = <1>;
> +            #size-cells = <1>;
> +
> +            soc_revision: soc-revision@0 {
> +                reg = <0x0 0x4>;
> +            };
> +          };
> +        };
>          gpio {
>            compatible = "xlnx,zynqmp-gpio-modepin";
>            gpio-controller;
> -- 
> 2.36.1
> 

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