linux-kernel - Re: [PATCH V4 2/4] dt-bindings: watchdog: xlnx,versal-wwdt: Add versal watchdog

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Message-ID: <fab945af-f42a-463d-95bb-89dc5509cae4@roeck-us.net>
Date:   Tue, 30 May 2023 05:14:48 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Srinivas Neeli <srinivas.neeli@....com>
Cc:     shubhrajyoti.datta@....com, michal.simek@....com,
        srinivas.goud@....com, wim@...ux-watchdog.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-watchdog@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, git@....com, git@...inx.com,
        neelisrinivas18@...il.com
Subject: Re: [PATCH V4 2/4] dt-bindings: watchdog: xlnx,versal-wwdt: Add
 versal watchdog

On Thu, Apr 20, 2023 at 04:12:29PM +0530, Srinivas Neeli wrote:
> Versal watchdog IP 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.
> 
> Add devicetree bindings for versal window watchdog device.
> 
> Signed-off-by: Srinivas Neeli <srinivas.neeli@....com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
> Changes in V4:
> - Updated commit subject(removed redundant "bindings").
> - Updated commit descriptioni(removed "this patch").
> - Updated watchdog.yaml reference to local.
> Changes in V3:
> - Removed  xlnx,close_percent property.
> Changes in V2:
> - Added watchdog ref
> - Removed timeout-sec property
> - Used 4 spaces for example indentation.
> ---
>  .../bindings/watchdog/xlnx,versal-wwdt.yaml   | 50 +++++++++++++++++++
>  1 file changed, 50 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..14b069599740
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml
> @@ -0,0 +1,50 @@
> +# 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 intellectual property 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: watchdog.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - xlnx,versal-wwdt
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    watchdog@...d0000 {
> +        compatible = "xlnx,versal-wwdt";
> +        reg = <0xfd4d0000 0x10000>;
> +        clocks = <&clock25>;
> +        timeout-sec = <30>;
> +    };
> +...
> -- 
> 2.25.1
>