linux-kernel - Re: [PATCH 2/4] dt-bindings: hwinfo: ti,k3-socinfo: Add nvmem-cells

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Date: Tue, 6 Feb 2024 18:43:05 +0000
From: Rob Herring <robh@...nel.org>
To: Markus Schneider-Pargmann <msp@...libre.com>
Cc: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Santosh Shilimkar <ssantosh@...nel.org>, Andrew Davis <afd@...com>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] dt-bindings: hwinfo: ti,k3-socinfo: Add nvmem-cells

On Tue, Feb 06, 2024 at 03:37:09PM +0100, Markus Schneider-Pargmann wrote:
> The information k3-socinfo requires is stored in an efuse area. This
> area is required by other devices/drivers as well, so using nvmem-cells
> can be a cleaner way to describe which information are used.
> 
> If nvmem-cells are supplied, the address range is not required.
> Cells chipvariant, chippartno and chipmanufacturer are introduced to
> cover all required information.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> Reviewed-by: Andrew Davis <afd@...com>
> ---
>  .../bindings/hwinfo/ti,k3-socinfo.yaml        | 23 ++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/hwinfo/ti,k3-socinfo.yaml b/Documentation/devicetree/bindings/hwinfo/ti,k3-socinfo.yaml
> index dada28b47ea0..f085b7275b7d 100644
> --- a/Documentation/devicetree/bindings/hwinfo/ti,k3-socinfo.yaml
> +++ b/Documentation/devicetree/bindings/hwinfo/ti,k3-socinfo.yaml
> @@ -26,9 +26,24 @@ properties:
>    reg:
>      maxItems: 1
>  
> +  nvmem-cells:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +
> +  nvmem-cell-names:
> +    items:
> +      - const: chipvariant
> +      - const: chippartno
> +      - const: chipmanufacturer
> +
>  required:
>    - compatible
> -  - reg
> +
> +oneOf:
> +  - required:
> +      - reg
> +  - required:
> +      - nvmem-cells
> +      - nvmem-cell-names
>  
>  additionalProperties: false
>  
> @@ -38,3 +53,9 @@ examples:
>          compatible = "ti,am654-chipid";
>          reg = <0x43000014 0x4>;
>      };
> +  - |
> +    chipid: chipid@14 {
> +        compatible = "ti,am654-chipid";

This isn't compatible if you have a completely different way to access 
it. 


> +        nvmem-cells = <&chip_variant>, <&chip_partno>, <&chip_manufacturer>;
> +        nvmem-cell-names = "chipvariant", "chippartno", "chipmanufacturer";
> +    };
> -- 
> 2.43.0
>