linux-kernel - Re: [PATCH 2/5] dt-bindings: nvmem: Convert xlnx,zynqmp-nvmem.txt to yaml

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Date:   Fri, 13 Oct 2023 11:23:03 -0500
From:   Rob Herring <robh@...nel.org>
To:     Praveen Teja Kundanala <praveen.teja.kundanala@....com>
Cc:     srinivas.kandagatla@...aro.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, michal.simek@....com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] dt-bindings: nvmem: Convert xlnx,zynqmp-nvmem.txt to
 yaml

On Fri, Oct 13, 2023 at 03:44:47PM +0530, Praveen Teja Kundanala wrote:
> Convert the xlnx,zynqmp-nvmem.txt to yaml.
> 
> Signed-off-by: Praveen Teja Kundanala <praveen.teja.kundanala@....com>
> ---
>  .../bindings/nvmem/xlnx,zynqmp-nvmem.txt      | 46 ---------------
>  .../bindings/nvmem/xlnx,zynqmp-nvmem.yaml     | 59 +++++++++++++++++++
>  2 files changed, 59 insertions(+), 46 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
>  create mode 100644 Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.yaml
> 
> diff --git a/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt b/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
> deleted file mode 100644
> index 4881561b3a02..000000000000
> --- a/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.txt
> +++ /dev/null
> @@ -1,46 +0,0 @@
> ---------------------------------------------------------------------------
> -=  Zynq UltraScale+ MPSoC nvmem firmware driver binding =
> ---------------------------------------------------------------------------
> -The nvmem_firmware node provides access to the hardware related data
> -like soc revision, IDCODE... etc, By using the firmware interface.
> -
> -Required properties:
> -- compatible: should be "xlnx,zynqmp-nvmem-fw"
> -
> -= Data cells =
> -Are child nodes of silicon id, bindings of which as described in
> -bindings/nvmem/nvmem.txt
> -
> --------
> - Example
> --------
> -firmware {
> -	zynqmp_firmware: zynqmp-firmware {
> -		compatible = "xlnx,zynqmp-firmware";
> -		method = "smc";
> -
> -		nvmem_firmware {
> -			compatible = "xlnx,zynqmp-nvmem-fw";
> -			#address-cells = <1>;
> -			#size-cells = <1>;
> -
> -			/* Data cells */
> -			soc_revision: soc_revision {
> -				reg = <0x0 0x4>;
> -			};
> -		};
> -	};
> -};
> -
> -= Data consumers =
> -Are device nodes which consume nvmem data cells.
> -
> -For example:
> -	pcap {
> -		...
> -
> -		nvmem-cells = <&soc_revision>;
> -		nvmem-cell-names = "soc_revision";
> -
> -		...
> -	};
> diff --git a/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.yaml b/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.yaml
> new file mode 100644
> index 000000000000..e03ed8c32537
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/nvmem/xlnx,zynqmp-nvmem.yaml
> @@ -0,0 +1,59 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/nvmem/xlnx,zynqmp-nvmem.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Zynq UltraScale+ MPSoC Non Volatile Memory interface
> +
> +description: |
> +    The ZynqMP MPSoC provides access to the hardware related data
> +    like SOC revision, IDCODE.
> +
> +maintainers:
> +  - Kalyani Akula <kalyani.akula@....com>
> +  - Praveen Teja Kundanala <praveen.teja.kundanala@....com>
> +
> +allOf:
> +  - $ref: "nvmem.yaml#"
> +
> +properties:
> +  compatible:
> +    const: xlnx,zynqmp-nvmem-fw
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 1
> +
> +required:
> +  - compatible
> +
> +patternProperties:
> +  "^soc_revision@0$":

Fixed string, not a pattern. dtschema will now flag this. Thanks for the 
test case. ;)

> +    type: object

Needs 'additionalProperties' or...


> +    description:
> +      This node is used to read SOC version and IDCODE of ZynqMP. Read-only.
> +

> +    properties:
> +      reg:
> +        maxItems: 1
> +
> +    required:
> +      - reg

fixed-cell.yaml (via nvmem.yaml) already says this, so this can all be 
dropped. Except that this[1] just landed, so you will need to adapt to 
it.

Though there is an issue that fixed-cell.yaml doesn't restrict the 
allowed properties, so that needs to happen somewhere... Not sure what 
the fix is. Hopefully fixed-cell.yaml can just be changed to 
'additionalProperties: false', but need to see if other properties are 
in use.

Rob

[1] https://lore.kernel.org/all/169667333484.74178.7121029453685069845.b4-ty@linaro.org/