linux-kernel - Re: R: R: [PATCH 1/3] watchdog: qcom-wdt: add option to skip pretimeout

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Date:   Tue, 4 Feb 2020 09:37:18 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     ansuelsmth@...il.com
Cc:     'Andy Gross' <agross@...nel.org>,
        'Bjorn Andersson' <bjorn.andersson@...aro.org>,
        'Wim Van Sebroeck' <wim@...ux-watchdog.org>,
        'Rob Herring' <robh+dt@...nel.org>,
        'Mark Rutland' <mark.rutland@....com>,
        linux-arm-msm@...r.kernel.org, linux-watchdog@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: R: R: [PATCH 1/3] watchdog: qcom-wdt: add option to skip
 pretimeout

On Tue, Feb 04, 2020 at 06:30:40PM +0100, ansuelsmth@...il.com wrote:
> > On Tue, Feb 04, 2020 at 05:16:34PM +0100, ansuelsmth@...il.com wrote:
> > > If something like this is used, msm-timer require interrupts. Without
> this
> > > configuration, the device is unbootable as the system froze on system
> > > bootup.
> > >
> > > timer@...a000 {
> > > 			compatible = "qcom,kpss-timer", "qcom,msm-timer";
> > > 			interrupts = <GIC_PPI 1 (GIC_CPU_MASK_SIMPLE(2) |
> > > 						 IRQ_TYPE_EDGE_RISING)>,
> > > 				     <GIC_PPI 2 (GIC_CPU_MASK_SIMPLE(2) |
> > > 						 IRQ_TYPE_EDGE_RISING)>,
> > > 				     <GIC_PPI 3 (GIC_CPU_MASK_SIMPLE(2) |
> > > 						 IRQ_TYPE_EDGE_RISING)>,
> > > 				     <GIC_PPI 4 (GIC_CPU_MASK_SIMPLE(2) |
> > > 						 IRQ_TYPE_EDGE_RISING)>,
> > > 				     <GIC_PPI 5 (GIC_CPU_MASK_SIMPLE(2) |
> > > 						 IRQ_TYPE_EDGE_RISING)>;
> > > 			no-pretimeout;
> > > 			reg = <0x0200a000 0x100>;
> > > 			clock-frequency = <25000000>,
> > > 					  <32768>;
> > > 			clocks = <&sleep_clk>;
> > > 			clock-names = "sleep";
> > > 			cpu-offset = <0x80000>;
> > > 		};
> > >
> > 
> > I think this is all wrong; the new property shows up in a node which
> > is completely unrelated to a watchdog. Maybe it wasn't such a good idea
> > to tie the watchdog to the timer node. At the very least, the situation
> > should be handled in the driver via of_table flags. If the situation can't
> > be handled that way, something is even more wrong. In that case it might
> > be better to revert commit 36375491a439 until that is sorted out properly.
> > 
> > Guenter
> > 
> 
> So pretimeout should be enabled only for kpss-wdt and disabled with a flag 
> in the of_table of the driver?
> 

Correct, if that is the determining factor.

Guenter