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

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Message-ID: <DB3PR0402MB391641F558061A561162136CF54C0@DB3PR0402MB3916.eurprd04.prod.outlook.com>
Date:   Thu, 7 Mar 2019 14:13:21 +0000
From:   Anson Huang <anson.huang@....com>
To:     Aisheng Dong <aisheng.dong@....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



Best Regards!
Anson Huang

> -----Original Message-----
> From: Aisheng Dong
> Sent: 2019年3月7日 22:00
> To: Anson Huang <anson.huang@....com>; catalin.marinas@....com;
> will.deacon@....com; shawnguo@...nel.org; s.hauer@...gutronix.de;
> kernel@...gutronix.de; festevam@...il.com; wim@...ux-watchdog.org;
> linux@...ck-us.net; Andy Gross <andy.gross@...aro.org>; heiko@...ech.de;
> horms+renesas@...ge.net.au; arnd@...db.de;
> maxime.ripard@...tlin.com; jagan@...rulasolutions.com;
> bjorn.andersson@...aro.org; enric.balletbo@...labora.com;
> marc.w.gonzalez@...e.fr; olof@...om.net; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...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?

But we don't have ATF driver in Linux kernel..., I am confused, anyway, if Guenter
agrees, I can remove this dependency here.

Anson.

> 
> 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.
> > > > +