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From: Guenter Roeck <linux@roeck-us.net>
To: ansuelsmth@gmail.com
Cc: 'Andy Gross' <agross@kernel.org>,
	'Bjorn Andersson' <bjorn.andersson@linaro.org>,
	'Wim Van Sebroeck' <wim@linux-watchdog.org>,
	'Rob Herring' <robh+dt@kernel.org>,
	'Mark Rutland' <mark.rutland@arm.com>,
	linux-arm-msm@vger.kernel.org, linux-watchdog@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: R: R: [PATCH 1/3] watchdog: qcom-wdt: add option to skip pretimeout
Date: Tue, 4 Feb 2020 09:37:18 -0800
Message-ID: <20200204173718.GA10098@roeck-us.net> (raw)
In-Reply-To: <035f01d5db80$d2ed1fb0$78c75f10$@gmail.com>

On Tue, Feb 04, 2020 at 06:30:40PM +0100, ansuelsmth@gmail.com wrote:
> > On Tue, Feb 04, 2020 at 05:16:34PM +0100, ansuelsmth@gmail.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@200a000 {
> > > 			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

      reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-04 15:21 Ansuel Smith
2020-02-04 15:21 ` [PATCH 2/3] Documentation: watchdog: qcom-wdt: Remove deprecated compatible Ansuel Smith
2020-02-04 16:09   ` Guenter Roeck
2020-02-06 19:15     ` Rob Herring
2020-02-04 15:21 ` [PATCH 3/3] Documentation: watchdog: qcom-wdt: add new no-pretimeout option Ansuel Smith
2020-02-04 16:11   ` Guenter Roeck
2020-02-04 16:08 ` [PATCH 1/3] watchdog: qcom-wdt: add option to skip pretimeout Guenter Roeck
2020-02-04 16:16   ` R: " ansuelsmth
2020-02-04 16:25     ` Guenter Roeck
2020-02-04 17:30       ` R: " ansuelsmth
2020-02-04 17:37         ` Guenter Roeck [this message]

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