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watchdog: sama5d4: Add comment explaining what happens on resume

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Because suspending to RAM may lose the register values, they are restored
on resume. This is currently done unconditionally because there is
currently no way to know (from the driver) whether they have really been
lost or are still valid. Writing MR also pings the watchdog and this may
not be what is expected so add a comment explaining why it happens.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.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@iguana.be>
This commit is contained in:
Alexandre Belloni 2017-03-02 18:31:14 +01:00 committed by Wim Van Sebroeck
parent 39bd56df7b
commit 5dca80f63e
1 changed files with 5 additions and 0 deletions
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5
drivers/watchdog/sama5d4_wdt.c
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@ -300,6 +300,11 @@ static int sama5d4_wdt_resume(struct device *dev)
{
struct sama5d4_wdt *wdt = dev_get_drvdata(dev);
/*
* FIXME: writing MR also pings the watchdog which may not be desired.
* This should only be done when the registers are lost on suspend but
* there is no way to get this information right now.
*/
sama5d4_wdt_init(wdt);
return 0;