linux-kernel - Re: [PATCH] dt-bindings: watchdog: Convert GPIO binding to json-schema

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Message-ID: <20230131170505.GA3598994@roeck-us.net>
Date:   Tue, 31 Jan 2023 09:05:05 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Robert Marko <robert.marko@...tura.hr>
Cc:     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,
        luka.perkov@...tura.hr
Subject: Re: [PATCH] dt-bindings: watchdog: Convert GPIO binding to
 json-schema

On Fri, Nov 25, 2022 at 12:29:04PM +0100, Robert Marko wrote:
> Convert the DT binding for GPIO WDT to JSON schema.
> 
> Cc: luka.perkov@...tura.hr
> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> Reviewed-by: Rob Herring <robh@...nel.org>

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

> ---
>  .../devicetree/bindings/watchdog/gpio-wdt.txt | 28 ----------
>  .../bindings/watchdog/gpio-wdt.yaml           | 55 +++++++++++++++++++
>  2 files changed, 55 insertions(+), 28 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
>  create mode 100644 Documentation/devicetree/bindings/watchdog/gpio-wdt.yaml
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
> deleted file mode 100644
> index 198794963786..000000000000
> --- a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
> +++ /dev/null
> @@ -1,28 +0,0 @@
> -* GPIO-controlled Watchdog
> -
> -Required Properties:
> -- compatible: Should contain "linux,wdt-gpio".
> -- gpios: From common gpio binding; gpio connection to WDT reset pin.
> -- hw_algo: The algorithm used by the driver. Should be one of the
> -  following values:
> -  - toggle: Either a high-to-low or a low-to-high transition clears
> -    the WDT counter. The watchdog timer is disabled when GPIO is
> -    left floating or connected to a three-state buffer.
> -  - level: Low or high level starts counting WDT timeout,
> -    the opposite level disables the WDT. Active level is determined
> -    by the GPIO flags.
> -- hw_margin_ms: Maximum time to reset watchdog circuit (milliseconds).
> -
> -Optional Properties:
> -- always-running: If the watchdog timer cannot be disabled, add this flag to
> -  have the driver keep toggling the signal without a client. It will only cease
> -  to toggle the signal when the device is open and the timeout elapsed.
> -
> -Example:
> -	watchdog: watchdog {
> -		/* ADM706 */
> -		compatible = "linux,wdt-gpio";
> -		gpios = <&gpio3 9 GPIO_ACTIVE_LOW>;
> -		hw_algo = "toggle";
> -		hw_margin_ms = <1600>;
> -	};
> diff --git a/Documentation/devicetree/bindings/watchdog/gpio-wdt.yaml b/Documentation/devicetree/bindings/watchdog/gpio-wdt.yaml
> new file mode 100644
> index 000000000000..155dc7965e9b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/gpio-wdt.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/watchdog/gpio-wdt.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: GPIO controlled watchdog
> +
> +maintainers:
> +  - Robert Marko <robert.marko@...tura.hr>
> +
> +properties:
> +  compatible:
> +    const: linux,wdt-gpio
> +
> +  gpios:
> +    maxItems: 1
> +    description: GPIO connected to the WDT reset pin
> +
> +  hw_algo:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    description: Algorithm used by the driver
> +    oneOf:
> +      - description:
> +          Either a high-to-low or a low-to-high transition clears the WDT counter.
> +          The watchdog timer is disabled when GPIO is left floating or connected
> +          to a three-state buffer.
> +        const: toggle
> +      - description:
> +          Low or high level starts counting WDT timeout, the opposite level
> +          disables the WDT.
> +          Active level is determined by the GPIO flags.
> +        const: level
> +
> +  hw_margin_ms:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Maximum time to reset watchdog circuit (in milliseconds)
> +    minimum: 2
> +    maximum: 65535
> +
> +  always-running:
> +    type: boolean
> +    description:
> +      If the watchdog timer cannot be disabled, add this flag to have the driver
> +      keep toggling the signal without a client.
> +      It will only cease to toggle the signal when the device is open and the
> +      timeout elapsed.
> +
> +required:
> +  - compatible
> +  - gpios
> +  - hw_algo
> +  - hw_margin_ms
> +
> +unevaluatedProperties: false