From: linux@roeck-us•net (Guenter Roeck)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH RFC] Watchdog: sbsa_gwdt: Enhance timeout range
Date: Thu, 5 May 2016 16:51:14 -0700 [thread overview]
Message-ID: <572BDC72.5050304@roeck-us.net> (raw)
In-Reply-To: <572BD959.3090507@codeaurora.org>
On 05/05/2016 04:38 PM, Timur Tabi wrote:
> Guenter Roeck wrote:
>> A 32-bit counter is absolutely fine. Letting it run with a 400MHz clock
>> (or was it 200 MHz ?) is the problem. A resolution of 2.5ns for a watchdog
>> timer does not really make any sense.
>
> The 10 second limit is based on a 20MHz clock.
>
Not that a resolution of 50 ns makes sense either, but 4294967296 / 20971520 = 204,
and 20971520 * 10 = 209715200 = 0x0c800000. Where does the resolution get lost ?
Guenter
prev parent reply other threads:[~2016-05-05 23:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-03 8:20 [PATCH RFC] Watchdog: sbsa_gwdt: Enhance timeout range Pratyush Anand
2016-05-03 12:12 ` Timur Tabi
2016-05-03 13:24 ` Pratyush Anand
2016-05-03 13:47 ` Guenter Roeck
2016-05-03 14:17 ` Pratyush Anand
2016-05-03 14:46 ` Guenter Roeck
2016-05-03 15:04 ` Timur Tabi
2016-05-03 13:29 ` Guenter Roeck
2016-05-03 14:38 ` Pratyush Anand
2016-05-03 15:07 ` Timur Tabi
2016-05-03 15:51 ` Pratyush Anand
2016-05-03 17:16 ` Guenter Roeck
2016-05-04 14:14 ` Pratyush Anand
2016-05-04 14:21 ` Timur Tabi
2016-05-04 15:59 ` Pratyush Anand
2016-05-04 16:17 ` Timur Tabi
2016-05-05 16:43 ` Guenter Roeck
2016-05-05 18:20 ` Pratyush Anand
2016-05-05 18:22 ` Timur Tabi
2016-05-05 23:36 ` Guenter Roeck
2016-05-05 23:38 ` Timur Tabi
2016-05-05 23:45 ` Timur Tabi
2016-05-06 0:18 ` Guenter Roeck
2016-05-05 23:51 ` Guenter Roeck [this message]
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