linux-kernel - Re: [PATCH RESEND V2 1/4] dt-bindings: fsl: scu: add watchdog binding

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Date:   Sat, 23 Feb 2019 09:08:10 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Rob Herring <robh@...nel.org>, Anson Huang <anson.huang@....com>
Cc:     "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        Aisheng Dong <aisheng.dong@....com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        Daniel Baluta <daniel.baluta@....com>,
        Andy Gross <andy.gross@...aro.org>,
        "horms+renesas@...ge.net.au" <horms+renesas@...ge.net.au>,
        "heiko@...ech.de" <heiko@...ech.de>,
        "arnd@...db.de" <arnd@...db.de>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "jagan@...rulasolutions.com" <jagan@...rulasolutions.com>,
        "enric.balletbo@...labora.com" <enric.balletbo@...labora.com>,
        "marc.w.gonzalez@...e.fr" <marc.w.gonzalez@...e.fr>,
        "olof@...om.net" <olof@...om.net>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH RESEND V2 1/4] dt-bindings: fsl: scu: add watchdog binding

On 2/22/19 11:52 AM, Rob Herring wrote:
> On Mon, Feb 18, 2019 at 06:53:48AM +0000, Anson Huang wrote:
>> Add i.MX8QXP system controller watchdog binding.
>>
>> Signed-off-by: Anson Huang <Anson.Huang@....com>
>> ---
>> Changes since V1:
>> 	- update dts node name to "watchdog";
>> ---
>>   Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt | 10 ++++++++++
>>   1 file changed, 10 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
>> index 4b79751..f388ec6 100644
>> --- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
>> +++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
>> @@ -136,6 +136,12 @@ Required properties:
>>   			   resource id for thermal driver to get temperature via
>>   			   SCU IPC.
>>   
>> +Watchdog bindings based on SCU Message Protocol
>> +------------------------------------------------------------
>> +
>> +Required properties:
>> +- compatible: should be "fsl,imx8qxp-sc-wdt";
>> +
>>   Example (imx8qxp):
>>   -------------
>>   lsio_mu1: mailbox@...c0000 {
>> @@ -188,6 +194,10 @@ firmware {
>>   			tsens-num = <1>;
>>   			#thermal-sensor-cells = <1>;
>>   		};
>> +
>> +		watchdog: watchdog {
>> +			compatible = "fsl,imx8qxp-sc-wdt";
> 
> As-is, there's no reason for this to be in DT. The parent node's driver
> can instantiate the wdog.
> 

As the driver is currently written, you are correct, since it doesn't accept
watchdog timeout configuration through devicetree.

Question is if that is intended. Is it ?

Thanks,
Guenter