linux-kernel - RE: [PATCH V2 2/4] watchdog: Add i.MX7ULP watchdog support

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Date:   Wed, 21 Aug 2019 02:27:36 +0000
From:   Anson Huang <anson.huang@....com>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "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>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "otavio@...ystems.com.br" <otavio@...ystems.com.br>,
        Leonard Crestez <leonard.crestez@....com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "schnitzeltony@...il.com" <schnitzeltony@...il.com>,
        "jan.tuerk@...rion.com" <jan.tuerk@...rion.com>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V2 2/4] watchdog: Add i.MX7ULP watchdog support

Hi, Guenter

> On Tue, Aug 20, 2019 at 08:31:55AM -0700, Guenter Roeck wrote:
> > On Mon, Aug 12, 2019 at 04:53:19PM +0800, Anson.Huang@....com
> wrote:
> > > From: Anson Huang <Anson.Huang@....com>
> > >
> > > The i.MX7ULP Watchdog Timer (WDOG) module is an independent timer
> > > that is available for system use.
> > > It provides a safety feature to ensure that software is executing as
> > > planned and that the CPU is not stuck in an infinite loop or
> > > executing unintended code. If the WDOG module is not serviced
> > > (refreshed) within a certain period, it resets the MCU.
> > >
> > > Add driver support for i.MX7ULP watchdog.
> > >
> > > Signed-off-by: Anson Huang <Anson.Huang@....com>
> >
> > Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> >
> 
> Wait, I have to withdraw that.
> 
> With clk_prepare_enable(), you'll also need to call clk_disable_unprepare()
> on remove. An easy way to do this and keep the code simple would be:
> 
> static void imx7ulp_wdt_clk_disable_unprepare(void *data) {
> 	clk_disable_unprepare(data);
> }
> 
> static int imx7ulp_wdt_probe(...)
> {
> 	...
> 	ret = clk_prepare_enable(imx7ulp_wdt->clk);
> 	if (ret)
> 		return ret;
> 	ret = devm_add_action_or_reset(dev,
> imx7ulp_wdt_clk_disable_unprepare);
> 	if (ret)
> 		return ret;
> 	...
> 

Ah, yes, I added the error handle but missed the remove case, thanks for your kindly
suggestion, please help review V3.

Thanks,
Anson.