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Date:   Fri, 25 Oct 2019 15:30:30 -0500
From:   Rob Herring <robh@kernel.org>
To:     Xingyu Chen <xingyu.chen@amlogic.com>
Cc:     Wim Van Sebroeck <wim@linux-watchdog.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Kevin Hilman <khilman@baylibre.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Jerome Brunet <jbrunet@baylibre.com>,
        Qianggui Song <qianggui.song@amlogic.com>,
        Jianxin Pan <jianxin.pan@amlogic.com>,
        Jian Hu <jian.hu@amlogic.com>, linux-watchdog@vger.kernel.org,
        linux-amlogic@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org
Subject: Re: [PATCH v3 2/4] dt-bindings: watchdog: add new binding for meson
 secure watchdog
Message-ID: <20191025203030.GA28391@bogus>
References: <1571983984-11771-1-git-send-email-xingyu.chen@amlogic.com>
 <1571983984-11771-3-git-send-email-xingyu.chen@amlogic.com>
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On Fri, Oct 25, 2019 at 02:13:02PM +0800, Xingyu Chen wrote:
> The binding targets the Meson-A/C series compatible SoCs, in which the
> watchdog registers are in secure world.
> 
> Signed-off-by: Xingyu Chen <xingyu.chen@amlogic.com>
> ---
>  .../bindings/watchdog/amlogic,meson-sec-wdt.yaml   | 34 ++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/amlogic,meson-sec-wdt.yaml
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/amlogic,meson-sec-wdt.yaml b/Documentation/devicetree/bindings/watchdog/amlogic,meson-sec-wdt.yaml
> new file mode 100644
> index 00000000..0bbc807
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/amlogic,meson-sec-wdt.yaml
> @@ -0,0 +1,34 @@
> +# SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +# Copyright (c) 2019 Amlogic, Inc
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/power/amlogic,meson-sec-wdt.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Amlogic Meson Secure Watchdog Timer
> +
> +maintainers:
> +  - Xingyu Chen <xingyu.chen@amlogic.com>
> +
> +description: |+
> +  Secure Watchdog Timer used in Meson-A/C series Compatible SoCs
> +
> +properties:
> +  compatible:
> +    enum:
> +      - amlogic,meson-sec-wdt

If there are no other properties, then you don't need this. Just have 
the secure firmware driver instantiate the watchdog.

> +
> +  secure-monitor:
> +    description: phandle to the secure-monitor node
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +
> +required:
> +  - compatible
> +  - secure-monitor
> +
> +examples:
> +  - |
> +    watchdog {
> +          compatible = "amlogic,meson-sec-wdt";
> +          secure-monitor = <&sm>;
> +    };
> -- 
> 2.7.4
>