linux-kernel - Re: [PATCH 1/2] dt-bindings: watchdog: Add arm,smc-wdt watchdog arm,smc-wdt compatible

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Date:   Sat, 14 Mar 2020 00:13:01 +0800
From:   Xingyu Chen <xingyu.chen@...ogic.com>
To:     Julius Werner <jwerner@...omium.org>
CC:     Evan Benn <evanbenn@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        <devicetree@...r.kernel.org>,
        LINUX-WATCHDOG <linux-watchdog@...r.kernel.org>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Yonghui Yu <yonghui.yu@...ogic.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        "David S. Miller" <davem@...emloft.net>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH 1/2] dt-bindings: watchdog: Add arm,smc-wdt watchdog
 arm,smc-wdt compatible

Hi, Julius

On 2020/3/12 3:24, Julius Werner wrote:
>> - *_INIT and *GETTIMEOUT.      Although your driver does not need them, could you take them as options in your driver ?
> The driver already has SMCWD_INFO which is used during probe to
> retrieve the minimum and maximum timeout values supported by the
> hardware at probe time. Maybe it would make sense to rename that to
> INIT (which would still return those values, but can also do whatever
> initialization needs to be done in TF)?
Yes，INIT would make sense for me.
> GETTIMELEFT I agree we can
> implement optionally, and other platforms would just return a
> PSCI_RET_NOT_SUPPORTED for that.
>
>> - *_RESETNOW.      It is used to reset the system right now, similar to your SOFT RESET. could you reserve an operation index in ATF ?
> Just curious, why do you need this? Shouldn't you use the PSCI
> standard SYSTEM_RESET SMC for that? (If you want to control exactly
> how the platform is reset, you could also use SYSTEM_RESET2 with a
> vendor-defined reset_type.)
I just wanted it to be compatible with other OS，and I  think it over, 
maybe I can also use the
PSCI interface to execuate the system reset on the other OS. Anyway, 
please ignore this request.

Thanks.
>
> .