Subject: Re: [PATCH 2/3 v2] crypto: ixp4xx: Add DT bindings

From: Rob Herring <[email-masked]>
Date: Fri, 21 May 2021 12:27:49 -0500

On Fri, May 21, 2021 at 12:30:20AM +0200, Linus Walleij wrote:
> This adds device tree bindings for the ixp4xx crypto engine.
> 
> Cc: Corentin Labbe <[email-masked]>
> Cc: [email-masked]
> Signed-off-by: Linus Walleij <[email-masked]>
> ---
> ChangeLog v1->v2:
> - Drop the phandle to self, just add an NPE instance number
>   instead.
> - Add the crypto node to the NPE binding.
> - Move the example over to the NPE binding where it appears
>   in context.
> ---
>  .../bindings/crypto/intel,ixp4xx-crypto.yaml  | 46 +++++++++++++++++++
>  ...ntel,ixp4xx-network-processing-engine.yaml | 13 +++++-
>  2 files changed, 58 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/crypto/intel,ixp4xx-crypto.yaml
> 
> diff --git a/Documentation/devicetree/bindings/crypto/intel,ixp4xx-crypto.yaml b/Documentation/devicetree/bindings/crypto/intel,ixp4xx-crypto.yaml
> new file mode 100644
> index 000000000000..79e9d23be1f4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/crypto/intel,ixp4xx-crypto.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2018 Linaro Ltd.
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/crypto/intel,ixp4xx-crypto.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Intel IXP4xx cryptographic engine
> +
> +maintainers:
> +  - Linus Walleij <[email-masked]>
> +
> +description: |
> +  The Intel IXP4xx cryptographic engine makes use of the IXP4xx NPE
> +  (Network Processing Engine). Since it is not a device on its own
> +  it is defined as a subnode of the NPE, if crypto support is
> +  available on the platform.
> +
> +properties:
> +  compatible:
> +    const: intel,ixp4xx-crypto
> +
> +  intel,npe:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 0
> +    maximum: 3
> +    description: phandle to the NPE this ethernet instance is using

Not a phandle now.

> +      and the instance to use in the second cell

Maybe 'reg' works here? You can only have 1 thing you address though if 
you use reg here.

How are other NPE instances used? Are you going to need to have a 
reference to them?

> +
> +  queue-rx:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    maxItems: 1
> +    description: phandle to the RX queue on the NPE

Plus a cell value. What's it for?

> +
> +  queue-txready:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    maxItems: 1
> +    description: phandle to the TX READY queue on the NPE

And here.

> +
> +required:
> +  - compatible
> +  - intel,npe
> +  - queue-rx
> +  - queue-txready
> +
> +additionalProperties: false
> diff --git a/Documentation/devicetree/bindings/firmware/intel,ixp4xx-network-processing-engine.yaml b/Documentation/devicetree/bindings/firmware/intel,ixp4xx-network-processing-engine.yaml
> index 1bd2870c3a9c..add46ae6c461 100644
> --- a/Documentation/devicetree/bindings/firmware/intel,ixp4xx-network-processing-engine.yaml
> +++ b/Documentation/devicetree/bindings/firmware/intel,ixp4xx-network-processing-engine.yaml
> @@ -30,6 +30,10 @@ properties:
>        - description: NPE1 register range
>        - description: NPE2 register range
>  
> +  crypto:
> +    type: object
> +    description: optional node for the embedded crypto engine

$ref: /schemas/crypto/intel,ixp4xx-crypto.yaml#

> +
>  required:
>    - compatible
>    - reg
> @@ -38,8 +42,15 @@ additionalProperties: false
>  
>  examples:
>    - |
> -    npe@c8006000 {
> +    npe: npe@c8006000 {
>           compatible = "intel,ixp4xx-network-processing-engine";
>           reg = <0xc8006000 0x1000>, <0xc8007000 0x1000>, <0xc8008000 0x1000>;
> +
> +         crypto {
> +             compatible = "intel,ixp4xx-crypto";
> +             intel,npe = <2>;
> +             queue-rx = <&qmgr 30>;
> +             queue-txready = <&qmgr 29>;
> +         };
>      };
>  ...
> -- 
> 2.31.1
> 

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