linux-kernel - RE: [PATCH V7 1/3] watchdog: imx_sc: Add i.MX system controller watchdog support

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Date:   Thu, 7 Mar 2019 13:59:59 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Anson Huang <anson.huang@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....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>,
        "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        Andy Gross <andy.gross@...aro.org>,
        "heiko@...ech.de" <heiko@...ech.de>,
        "horms+renesas@...ge.net.au" <horms+renesas@...ge.net.au>,
        "arnd@...db.de" <arnd@...db.de>,
        "maxime.ripard@...tlin.com" <maxime.ripard@...tlin.com>,
        "jagan@...rulasolutions.com" <jagan@...rulasolutions.com>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "enric.balletbo@...labora.com" <enric.balletbo@...labora.com>,
        "marc.w.gonzalez@...e.fr" <marc.w.gonzalez@...e.fr>,
        "olof@...om.net" <olof@...om.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V7 1/3] watchdog: imx_sc: Add i.MX system controller
 watchdog support

[...]

> > As I replied in another mail, it actually does not depend on SCU.
> > Let's wait for Rob's comment on whether we could move watchdog Out of
> > SCU node.
> 
> Per previous discussion, the dependency here is to prevent enabling this
> module for platform without IMX SCU, although it does NOT use SCU IPC call,
> but the SMC call trap into ARM-Trusted-Firmware will eventually call SCU API,
> so it still depends on IMX SCU hardware, I am NOT very sure if it is correct to
> remove it here.
> 

Then it's ATF depends on SCU, not this virtual watchdog based on ARM SIP, right?

Regards
Dong Aisheng

> >
> > > +	depends on HAVE_ARM_SMCCC
> > > +	select WATCHDOG_CORE
> > > +	help
> > > +	  This is the driver for the system controller watchdog
> > > +	  on the NXP i.MX SoCs with system controller inside.
> > > +	  If you have one of these processors and wish to have
> > > +	  watchdog support enabled, say Y, otherwise say N.
> > > +