linux-kernel - Re: [PATCH v2 1/8] dt-bindings: arm/npcm: Add binding for global control registers (GCR)

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Message-ID: <YbNqKfwYes0rH07B@robh.at.kernel.org>
Date:   Fri, 10 Dec 2021 08:54:33 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        openbmc@...ts.ozlabs.org, Tomer Maimon <tmaimon77@...il.com>,
        Joel Stanley <joel@....id.au>, linux-kernel@...r.kernel.org,
        Avi Fishman <avifishman70@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>
Subject: Re: [PATCH v2 1/8] dt-bindings: arm/npcm: Add binding for global
 control registers (GCR)

On Tue, Dec 07, 2021 at 10:08:16PM +0100, Jonathan Neuschäfer wrote:
> A nuvoton,*-gcr node is present in nuvoton-common-npcm7xx.dtsi and will
> be added to nuvoton-wpcm450.dtsi. It is necessary for the NPCM7xx and
> WPCM450 pinctrl drivers, and may later be used to retrieve SoC model and
> version information.
> 
> This patch adds a binding to describe this node.
> 
> Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
> 
> ---
> v2:
> - Rename node in example to syscon@...000
> - Add subnode to example
> 
> v1:
> - https://lore.kernel.org/lkml/20210602120329.2444672-2-j.neuschaefer@gmx.net/
> ---
>  .../bindings/arm/npcm/nuvoton,gcr.yaml        | 45 +++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/npcm/nuvoton,gcr.yaml
> 
> diff --git a/Documentation/devicetree/bindings/arm/npcm/nuvoton,gcr.yaml b/Documentation/devicetree/bindings/arm/npcm/nuvoton,gcr.yaml
> new file mode 100644
> index 0000000000000..62020d7ac305b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/npcm/nuvoton,gcr.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/npcm/nuvoton,gcr.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Global Control Registers block in Nuvoton SoCs
> +
> +maintainers:
> +  - Jonathan Neuschäfer <j.neuschaefer@....net>
> +
> +description: |

Don't need '|' if no formatting.

> +  The Global Control Registers (GCR) are a block of registers in Nuvoton SoCs
> +  that expose misc functionality such as chip model and version information or
> +  pinmux settings.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - nuvoton,wpcm450-gcr
> +          - nuvoton,npcm750-gcr
> +      - const: syscon
> +      - const: simple-mfd

blank line

> +  reg: true

Need to define how many entries:

maxItems: 1


> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false

Ideally, you should define the child node names, but you can do this:

additionalProperties:
  type: object

which means anything undefined must be a node.

> +
> +examples:
> +  - |
> +    gcr: syscon@...000 {
> +      compatible = "nuvoton,npcm750-gcr", "syscon", "simple-mfd";
> +      reg = <0x800000 0x1000>;
> +
> +      uart-mux-controller {
> +        compatible = "mmio-mux";
> +        #mux-control-cells = <1>;
> +        mux-reg-masks = <0x38 0x07>;
> +        idle-states = <2>;
> +      };
> +    };
> --
> 2.30.2
> 
>