linux-kernel - Re: [PATCH V2 2/4] dt-bindings: watchdog: xlnx,versal-wwdt: Add versal watchdog bindings

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Message-ID: <99fbc30c-7239-f63b-c76d-0b55a377eea7@linaro.org>
Date:   Thu, 2 Mar 2023 08:38:34 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Srinivas Neeli <srinivas.neeli@....com>, linux@...ck-us.net,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        michal.simek@....com, neelisrinivas18@...il.com
Cc:     wim@...ux-watchdog.org, linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        git@...inx.com, git@....com, devicetree@...r.kernel.org
Subject: Re: [PATCH V2 2/4] dt-bindings: watchdog: xlnx,versal-wwdt: Add
 versal watchdog bindings

On 01/03/2023 18:52, Srinivas Neeli wrote:
> Versal watchdog driver uses window watchdog mode. Window watchdog
> timer(WWDT) contains closed(first) and open(second) window with
> 32 bit width. Write to the watchdog timer within predefined window
> periods of time. This means a period that is not too soon and
> a period that is not too late.
> 
> Updated devicetree bindings for adding versal window watchdog device.
> 
> Signed-off-by: Srinivas Neeli <srinivas.neeli@....com>
> ---
> Changes in V2:
> - Added watchdog ref
> - Removed timeout-sec property
> - Used 4 spaces for example indentation.
> ---
>  .../bindings/watchdog/xlnx,versal-wwdt.yaml   | 58 +++++++++++++++++++
>  1 file changed, 58 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml b/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml
> new file mode 100644
> index 000000000000..733de1ac60e8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml
> @@ -0,0 +1,58 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/watchdog/xlnx,versal-wwdt.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Xilinx Versal window watchdog timer controller
> +
> +maintainers:
> +  - Neeli Srinivas <srinivas.neeli@....com>
> +
> +description:
> +  Versal watchdog driver uses window watchdog mode. Window watchdog
> +  timer(WWDT) contains closed(first) and open(second) window with
> +  32 bit width. Write to the watchdog timer within predefined window
> +  periods of time. This means a period that is not too soon and a
> +  period that is not too late. The WWDT has to be restarted within
> +  the open window time. If software tries to restart WWDT outside of
> +  the open window time period, it generates a reset.
> +
> +allOf:
> +  - $ref: /schemas/watchdog/watchdog.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - xlnx,versal-wwdt
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  xlnx,close_percent:
> +    $ref: "/schemas/types.yaml#/definitions/uint32"
> +    minimum: 1
> +    maximum: 99
> +    default: 50
> +    description: closed window percentage

There was no such property before and your changelog does not explain
it. Don't add new stuff silently in new versions.

There are several issues with this - missing dscription (you just copied
name of property!), unneeded quotes, using underscore, incorrect name
suffix... but what's the most important - what is the justification to
put it into DT? IOW, why this is suitable for DT?


Best regards,
Krzysztof