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Date:   Sat, 23 Feb 2019 19:20:21 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Anson Huang <anson.huang@....com>, Rob Herring <robh@...nel.org>
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 2/23/19 7:04 PM, Anson Huang wrote:
> Hi, Guenter/Rob
> 
> Best Regards!
> Anson Huang
> 
>> -----Original Message-----
>> From: Guenter Roeck [mailto:groeck7@...il.com] On Behalf Of Guenter
>> Roeck
>> Sent: 2019年2月24日 1:08
>> To: Rob Herring <robh@...nel.org>; Anson Huang <anson.huang@....com>
>> Cc: mark.rutland@....com; shawnguo@...nel.org;
>> s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com;
>> catalin.marinas@....com; will.deacon@....com; wim@...ux-watchdog.org;
>> Aisheng Dong <aisheng.dong@....com>; ulf.hansson@...aro.org; Daniel
>> Baluta <daniel.baluta@....com>; Andy Gross <andy.gross@...aro.org>;
>> horms+renesas@...ge.net.au; heiko@...ech.de; arnd@...db.de;
>> bjorn.andersson@...aro.org; jagan@...rulasolutions.com;
>> enric.balletbo@...labora.com; marc.w.gonzalez@...e.fr; olof@...om.net;
>> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; linux-arm-
>> kernel@...ts.infradead.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 ?
> 
> I am a little confused, do you mean we no need to have "watchdog" node in side "scu"
> node? Or we need to modify the watchdog node's compatible string to " fsl,imx-sc-wdt" to make
> it more generic for other platforms? If yes, I can resend the patch series to modify it.
>   

I think Rob suggested that the SCU parent driver should instantiate the watchdog
without explicit watchdog node. That would be possible, but it currently uses
devm_of_platform_populate() to do the instantiation, and changing that would
be a mess. Besides, it does sem to me that your suggested node would describe
the hardware, so I am not sure I understand the reasoning.

For my part I referred to
	watchdog_init_timeout(imx_sc_wdd, DEFAULT_TIMEOUT, &pdev->dev);
in the driver, which guarantees that the timeout property will not be used
to set the timeout. A more common implementation would have been

	imx_sc_wdd->timeout = DEFAULT_TIMEOUT;
	ret = watchdog_init_timeout(imx_sc_wdd, timeout, &pdev->dev);

where 'timeout' is the module parameter. Which is actually not used in your driver.
Hmm ... I wasn't careful enough with my review. The timeout initialization as-is
doesn't make sense. I'll comment on that in the patch.

Guenter

> Anson.
> 
>>
>> Thanks,
>> Guenter

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