Re: [PATCH RFC 3/6] dt-bindings: watchdog: Add Qualcomm restart reason binding

[Krzysztof Kozlowski]

On 08/04/2025 10:49, Kathiravan Thirumoorthy wrote:
> Add a devicetree binding for the Qualcomm IPQ SOCs restart reason
> information region found in the IMEM, allowing the system to identify
> the cause of a restart.
> 
> Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@xxxxxxxxxxxxxxxx>
> ---
>  .../bindings/watchdog/qcom,restart-reason.yaml     | 46 ++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/qcom,restart-reason.yaml b/Documentation/devicetree/bindings/watchdog/qcom,restart-reason.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..babbaa70b114f9691018ed6cb10bfa78e18fad64
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/qcom,restart-reason.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/watchdog/qcom,restart-reason.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm IPQ SoC restart reason location
> +
> +maintainers:
> +  - Kathiravan Thirumoorthy <kathiravan.thirumoorthy@xxxxxxxxxxxxxxxx>
> +
> +description:
> +  The Qualcomm IPQ SoC restart reason memory region, in IMEM, is used to
> +  identify the cause of the system restart. This will be helpful to identify
> +  the cause when the RAM dump collection is disabled.
> +
> +properties:
> +  compatible:
> +    const: qcom,restart-reason-info

No generic compatibles.

OTOH, I don't see much of a value of this being a separate node.

> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    imem@8600000 {
> +      compatible = "qcom,ipq5424-imem", "syscon", "simple-mfd";
> +      reg = <0x08600000 0x1000>;
> +
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +
> +      ranges = <0 0x08600000 0x1000>;

Drop all above.

> +
> +      restart-reason@7b0 {
> +        compatible = "qcom,restart-reason-info";
> +        reg = <0x7b0 0x4>;
> +      };
> +    };
> +...
> 


Best regards,
Krzysztof