linux-kernel - Re: [PATCH 3/3] dt-bindings: remoteproc: Add Arm remoteproc

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Date: Fri, 1 Mar 2024 20:30:43 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: abdellatif.elkhlifi@....com, Bjorn Andersson <andersson@...nel.org>,
 Mathieu Poirier <mathieu.poirier@...aro.org>,
 Rob Herring <robh+dt@...nel.org>
Cc: Liviu Dudau <liviu.dudau@....com>, Sudeep Holla <sudeep.holla@....com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Drew.Reed@....com,
 Adam.Johnston@....com, linux-arm-kernel@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH 3/3] dt-bindings: remoteproc: Add Arm remoteproc

On 01/03/2024 17:42, abdellatif.elkhlifi@....com wrote:
> From: Abdellatif El Khlifi <abdellatif.elkhlifi@....com>
> 
> introduce the bindings for Arm remoteproc support.
> 
> Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@....com>
> ---
>  .../bindings/remoteproc/arm,rproc.yaml        | 69 +++++++++++++++++++
>  MAINTAINERS                                   |  1 +

Fix order of patches - bindings are always before the user (see
submitting bindings doc).

>  2 files changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/remoteproc/arm,rproc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/arm,rproc.yaml b/Documentation/devicetree/bindings/remoteproc/arm,rproc.yaml
> new file mode 100644
> index 000000000000..322197158059
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/arm,rproc.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/remoteproc/arm,rproc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Arm Remoteproc Devices

That's quite generic... does it applied to all ARM designs?

> +
> +maintainers:
> +  - Abdellatif El Khlifi <abdellatif.elkhlifi@....com>
> +
> +description: |
> +  Some Arm heterogeneous System-On-Chips feature remote processors that can
> +  be controlled with a reset control register and a reset status register to
> +  start or stop the processor.
> +
> +  This document defines the bindings for these remote processors.

Drop last sentence.

> +
> +properties:
> +  compatible:
> +    enum:
> +      - arm,corstone1000-extsys
> +
> +  reg:
> +    minItems: 2
> +    maxItems: 2
> +    description: |
> +      Address and size in bytes of the reset control register
> +      and the reset status register.
> +      Expects the registers to be in the order as above.
> +      Should contain an entry for each value in 'reg-names'.

Entirely redundant sentences... instead this all just list items with
description.

> +
> +  reg-names:Do not need '|' unless you need to preserve formatting.
> +    description: |
> +      Required names for each of the reset registers defined in
> +      the 'reg' property. Expects the names from the following
> +      list, in the specified order, each representing the corresponding
> +      reset register.

Really, drop.

> +    items:
> +      - const: reset-control
> +      - const: reset-status
> +
> +  firmware-name:
> +    description: |

Do not need '|' unless you need to preserve formatting.

> +      Default name of the firmware to load to the remote processor.
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - firmware-name
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    extsys0: remoteproc@...10310 {

Drop label, not used.

> +            compatible = "arm,corstone1000-extsys";

Use 4 spaces for example indentation.

> +            reg = <0x1a010310 0x4>, <0x1a010314 0x4>;
> +            reg-names = "reset-control", "reset-status";
> +            firmware-name = "es0_flashfw.elf";
> +    };
> +
> +    extsys1: remoteproc@...10318 {
> +            compatible = "arm,corstone1000-extsys";

These are the same examples, so keep only one.

> +            reg = <0x1a010318 0x4>, <0x1a01031c 0x4>;
> +            reg-names = "reset-control", "reset-status";
> +            firmware-name = "es1_flashfw.elf";
> +    };

Best regards,
Krzysztof