linux-kernel - Re: [PATCH 2/3] dt: bindings: add ralink RT2880 resets device tree binding documentation

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Date:   Mon, 4 Oct 2021 13:06:44 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sergio Paracuellos <sergio.paracuellos@...il.com>
Cc:     linux-staging@...ts.linux.dev, john@...ozen.org,
        devicetree@...r.kernel.org, gregkh@...uxfoundation.org,
        neil@...wn.name, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dt: bindings: add ralink RT2880 resets device tree
 binding documentation

On Sun, Sep 26, 2021 at 04:59:30PM +0200, Sergio Paracuellos wrote:
> Adds device tree binding documentation for resets in the ralink RT2880 SoCs.
> 
> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
> ---
>  .../bindings/reset/ralink,rt2880-reset.yaml   | 39 +++++++++++++++++++
>  1 file changed, 39 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/reset/ralink,rt2880-reset.yaml
> 
> diff --git a/Documentation/devicetree/bindings/reset/ralink,rt2880-reset.yaml b/Documentation/devicetree/bindings/reset/ralink,rt2880-reset.yaml
> new file mode 100644
> index 000000000000..88eddeb4ee45
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reset/ralink,rt2880-reset.yaml
> @@ -0,0 +1,39 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/reset/ralink,rt2880-reset.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ralink RT2880 Reset Controller Device Tree Bindings
> +
> +maintainers:
> +  - Sergio Paracuellos <sergio.paracuellos@...il.com>
> +
> +description: |
> +  Ralink RT2880 reset controller driver which supports the SoC
> +  system controller supplied reset registers for the various peripherals
> +  of the SoC.
> +
> +  See also:
> +  - dt-bindings/reset/ralink-rt2880.h
> +
> +properties:
> +  compatible:
> +    const: ralink,rt2880-reset
> +
> +  '#reset-cells':
> +    const: 1
> +
> +required:
> +  - '#reset-cells'
> +  - compatible
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/reset/ralink-rt2880.h>
> +    rstctrl: reset-controller {
> +      compatible = "ralink,rt2880-reset";
> +      #reset-cells = <1>;

How is this h/w controlled? If this is part of a system controller, then 
it needs to be documented as such. IOW, you need to document the binding 
for the whole block.

Do you really need a child node here? All you need to make a system 
controller a reset provider is add '#reset-cells' to it.

Rob