linux-kernel - Re: [PATCH v2 1/3] dt-bindings: misc: add bindings for Intel HPS Copy Engine

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Date:   Wed, 4 May 2022 17:04:52 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     matthew.gerlach@...ux.intel.com, dinguyen@...nel.org,
        robh+dt@...nel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org
Subject: Re: [PATCH v2 1/3] dt-bindings: misc: add bindings for Intel HPS Copy
 Engine

On 03/05/2022 21:45, matthew.gerlach@...ux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> 
> Add device tree bindings documentation for the Intel Hard
> Processor System (HPS) Copy Engine.
> 
> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> ---
>  .../bindings/misc/intel,hps-copy-engine.yaml  | 48 +++++++++++++++++++
>  1 file changed, 48 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/misc/intel,hps-copy-engine.yaml
> 
> diff --git a/Documentation/devicetree/bindings/misc/intel,hps-copy-engine.yaml b/Documentation/devicetree/bindings/misc/intel,hps-copy-engine.yaml
> new file mode 100644
> index 000000000000..74e7da9002f4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/intel,hps-copy-engine.yaml

Please find appropriate directory matching this hardware, not "misc". As
a fallback SoC related bindings end up in "soc".

> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (C) 2022, Intel Corporation
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/misc/intel,hps-copy-engine.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Intel HPS Copy Engine
> +
> +maintainers:
> +  - Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> +
> +description: |
> +  The Intel Hard Processor System (HPS) Copy Engine is an IP block used to copy
> +  a bootable image from host memory to HPS DDR.  Additionally, there is a
> +  register the HPS can use to indicate the state of booting the copied image as
> +  well as a keep-a-live indication to the host.
> +
> +properties:
> +  compatible:
> +    items:

No "items", you have just one item.

> +      - const: intel,hps-copy-engine
> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    agilex_hps_bridges: bus@...00000 {

Unused label...

> +        compatible = "simple-bus";
> +        reg = <0x80000000 0x60000000>,
> +              <0xf9000000 0x00100000>;
> +        reg-names = "axi_h2f", "axi_h2f_lw";
> +        #address-cells = <0x2>;

$ git grep address-cell
Do not use inconsistent coding. The same applies to your DTS.

> +        #size-cells = <0x1>;
> +        ranges = <0x00000000 0x00000000 0xf9000000 0x00001000>;

Why do you even need the simple-bus above and cannot put the device
directly on the bus?

> +
> +        hps_cp_eng@0 {

No underscores in node names. Generic node name.

> +            compatible = "intel,hps-copy-engine";
> +            reg = <0x00000000 0x00000000 0x00001000>;
> +        };
> +    };


Best regards,
Krzysztof