linux-kernel - Re: [PATCH v3 2/4] dt-bindings: watchdog: add new binding for meson secure watchdog

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Date:   Mon, 28 Oct 2019 16:35:18 +0800
From:   Xingyu Chen <xingyu.chen@...ogic.com>
To:     Rob Herring <robh@...nel.org>
CC:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Qianggui Song <qianggui.song@...ogic.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Jian Hu <jian.hu@...ogic.com>,
        <linux-watchdog@...r.kernel.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 2/4] dt-bindings: watchdog: add new binding for meson
 secure watchdog

Hi, Rob

On 2019/10/26 4:30, Rob Herring wrote:
> 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@...ogic.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@...ogic.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.
I'am very sorry i don't understand how to initialize the watchdog driver 
if the compatible property is removed, Could you give me more 
suggestions or examples ？ Thank you very much.

> 
>> +
>> +  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
>>
> 
> .
>