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watchdog: add documentation for PM usage 

Add the first rule we recently agreed on.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
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Wolfram Sang 2018-12-17 20:33:14 +01:00 committed by Wim Van Sebroeck
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commit e536f7304b
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Documentation/watchdog/watchdog-pm.txt Normal file
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The Linux WatchDog Timer Power Management Guide
===============================================
Last reviewed: 17-Dec-2018
Wolfram Sang <wsa+renesas@sang-engineering.com>
Introduction
------------
This document states rules about watchdog devices and their power management
handling to ensure a uniform behaviour for Linux systems.
Ping on resume
--------------
On resume, a watchdog timer shall be reset to its selected value to give
userspace enough time to resume. [1] [2]
[1] https://patchwork.kernel.org/patch/10252209/
[2] https://patchwork.kernel.org/patch/10711625/