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

[Rob Herring <robh@kernel.org>]

On Mon, May 10, 2021 at 11:36:33PM +0200, Linus Walleij wrote:
> This adds device tree bindings for the ixp4xx crypto engine.
> 
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> Herbert, David: This can be applied separately once we are
> happy with the bindings, alternatively it can be merged
> with the support code into ARM SoC.
> ---
>  .../bindings/crypto/intel,ixp4xx-crypto.yaml  | 59 +++++++++++++++++++
>  1 file changed, 59 insertions(+)
>  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..28d75f4f9a76
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/crypto/intel,ixp4xx-crypto.yaml
> @@ -0,0 +1,59 @@
> +# 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 <linus.walleij@linaro.org>
> +
> +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-handle:
> +    $ref: '/schemas/types.yaml#/definitions/phandle-array'
> +    maxItems: 1
> +    description: phandle to the NPE this ethernet instance is using
> +      and the instance to use in the second cell
> +
> +  queue-rx:
> +    $ref: '/schemas/types.yaml#/definitions/phandle-array'
> +    maxItems: 1
> +    description: phandle to the RX queue on the NPE
> +
> +  queue-txready:
> +    $ref: '/schemas/types.yaml#/definitions/phandle-array'
> +    maxItems: 1
> +    description: phandle to the TX READY queue on the NPE
> +
> +required:
> +  - compatible
> +  - intel,npe-handle
> +  - queue-rx
> +  - queue-txready
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    npe: npe@c8006000 {
> +         compatible = "intel,ixp4xx-network-processing-engine";
> +         reg = <0xc8006000 0x1000>, <0xc8007000 0x1000>, <0xc8008000 0x1000>;
> +
> +         crypto {

The parent schema needs to define 'crypto' and have a ref to this 
schema. I'd put the example there rather than piecemeal.

> +             compatible = "intel,ixp4xx-crypto";
> +             intel,npe-handle = <&npe 2>;

A bit redundant to have a phandle to the parent.

> +             queue-rx = <&qmgr 30>;
> +             queue-txready = <&qmgr 29>;
> +         };
> +    };
> -- 
> 2.30.2
>