linux-kernel - Re: [PATCH 1/4] dt-bindings: reset: add schema for imx8ulp SIM reset

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Date: Fri, 17 May 2024 14:59:43 -0500
From: Rob Herring <robh@...nel.org>
To: Laurentiu Mihalcea <laurentiumihalcea111@...il.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Liu Ying <victor.liu@....com>,
	Sascha Hauer <s.hauer@...gutronix.de>, laurentiu.mihalcea@....com,
	devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: reset: add schema for imx8ulp SIM reset

On Thu, May 16, 2024 at 11:40:28PM +0300, Laurentiu Mihalcea wrote:
> From: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
> 
> Add schema for imx8ulp's SIM reset controller.
> 
> Signed-off-by: Liu Ying <victor.liu@....com>
> Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
> ---
>  .../bindings/reset/nxp,imx8ulp-sim-reset.yaml | 43 +++++++++++++++++++
>  1 file changed, 43 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/reset/nxp,imx8ulp-sim-reset.yaml
> 
> diff --git a/Documentation/devicetree/bindings/reset/nxp,imx8ulp-sim-reset.yaml b/Documentation/devicetree/bindings/reset/nxp,imx8ulp-sim-reset.yaml
> new file mode 100644
> index 000000000000..ec9a5c73e83c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reset/nxp,imx8ulp-sim-reset.yaml
> @@ -0,0 +1,43 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/reset/nxp,imx8ulp-sim-reset.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP i.MX8ULP System Integration Module Reset Controller
> +
> +maintainers:
> +  - Liu Ying <victor.liu@....com>
> +
> +description: |
> +  Some instances of i.MX8ULP's SIM may offer control over the
> +  reset of some components of a certain domain (e.g: AVD-SIM).
> +  As far as the DT is concerned, this means that the reset
> +  controller needs to be a child of the SIM node.
> +
> +properties:
> +  compatible:
> +    const: nxp,imx8ulp-avd-sim-reset
> +
> +  '#reset-cells':
> +    const: 1
> +
> +required:
> +  - compatible
> +  - '#reset-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8ulp-clock.h>
> +    syscon@...50000 {
> +      compatible = "nxp,imx8ulp-avd-sim", "syscon";
> +      reg = <0x2da50000 0x38>;
> +      clocks = <&pcc5 IMX8ULP_CLK_AVD_SIM>;
> +
> +      reset-controller {
> +        compatible = "nxp,imx8ulp-avd-sim-reset";
> +        #reset-cells = <1>;
> +      };
> +    };

Why do you need a child node here? No DT resources or anything for this 
'sub-block'. Just put "#reset-cells" in the parent node.

(Note that examples for MFDs like this go in the MFD binding rather than 
having incomplete examples here.)

Rob