1What:		/sys/class/watchdog/watchdogn/bootstatus
2Date:		August 2015
3Contact:	Wim Van Sebroeck <wim@iguana.be>
4Description:
5		It is a read only file. It contains status of the watchdog
6		device at boot. It is equivalent to WDIOC_GETBOOTSTATUS of
7		ioctl interface.
8
9What:		/sys/class/watchdog/watchdogn/identity
10Date:		August 2015
11Contact:	Wim Van Sebroeck <wim@iguana.be>
12Description:
13		It is a read only file. It contains identity string of
14		watchdog device.
15
16What:		/sys/class/watchdog/watchdogn/nowayout
17Date:		August 2015
18Contact:	Wim Van Sebroeck <wim@iguana.be>
19Description:
20		It is a read/write file. While reading, it gives '1'
21		if the device has the nowayout feature set, otherwise
22		it gives '0'. Writing a '1' to the file enables the
23		nowayout feature. Once set, the nowayout feature
24		cannot be disabled, so writing a '0' either has no
25		effect (if the feature was already disabled) or
26		results in a permission error.
27
28What:		/sys/class/watchdog/watchdogn/state
29Date:		August 2015
30Contact:	Wim Van Sebroeck <wim@iguana.be>
31Description:
32		It is a read only file. It gives active/inactive status of
33		watchdog device.
34
35What:		/sys/class/watchdog/watchdogn/status
36Date:		August 2015
37Contact:	Wim Van Sebroeck <wim@iguana.be>
38Description:
39		It is a read only file. It contains watchdog device's
40		internal status bits. It is equivalent to WDIOC_GETSTATUS
41		of ioctl interface.
42
43What:		/sys/class/watchdog/watchdogn/timeleft
44Date:		August 2015
45Contact:	Wim Van Sebroeck <wim@iguana.be>
46Description:
47		It is a read only file. It contains value of time left for
48		reset generation. It is equivalent to WDIOC_GETTIMELEFT of
49		ioctl interface.
50
51What:		/sys/class/watchdog/watchdogn/timeout
52Date:		August 2015
53Contact:	Wim Van Sebroeck <wim@iguana.be>
54Description:
55		It is a read only file. It is read to know about current
56		value of timeout programmed.
57
58What:		/sys/class/watchdog/watchdogn/pretimeout
59Date:		December 2016
60Contact:	Wim Van Sebroeck <wim@iguana.be>
61Description:
62		It is a read only file. It specifies the time in seconds before
63		timeout when the pretimeout interrupt is delivered.  Pretimeout
64		is an optional feature.
65
66What:		/sys/class/watchdog/watchdogn/pretimeout_avaialable_governors
67Date:		February 2017
68Contact:	Wim Van Sebroeck <wim@iguana.be>
69Description:
70		It is a read only file. It shows the pretimeout governors
71		available for this watchdog.
72
73What:		/sys/class/watchdog/watchdogn/pretimeout_governor
74Date:		February 2017
75Contact:	Wim Van Sebroeck <wim@iguana.be>
76Description:
77		It is a read/write file. When read, the currently assigned
78		pretimeout governor is returned.  When written, it sets
79		the pretimeout governor.
80
81What:		/sys/class/watchdog/watchdog1/access_cs0
82Date:		August 2019
83Contact:	Ivan Mikhaylov <i.mikhaylov@yadro.com>,
84		Alexander Amelkin <a.amelkin@yadro.com>
85Description:
86		It is a read/write file. This attribute exists only if the
87		system has booted from the alternate flash chip due to
88		expiration of a watchdog timer of AST2400/AST2500 when
89		alternate boot function was enabled with 'aspeed,alt-boot'
90		devicetree option for that watchdog or with an appropriate
91		h/w strapping (for WDT2 only).
92
93		At alternate flash the 'access_cs0' sysfs node provides:
94			ast2400: a way to get access to the primary SPI flash
95				chip at CS0 after booting from the alternate
96				chip at CS1.
97			ast2500: a way to restore the normal address mapping
98				from (CS0->CS1, CS1->CS0) to (CS0->CS0,
99				CS1->CS1).
100
101		Clearing the boot code selection and timeout counter also
102		resets to the initial state the chip select line mapping. When
103		the SoC is in normal mapping state (i.e. booted from CS0),
104		clearing those bits does nothing for both versions of the SoC.
105		For alternate boot mode (booted from CS1 due to wdt2
106		expiration) the behavior differs as described above.
107
108		This option can be used with wdt2 (watchdog1) only.
109
110		When read, the current status of the boot code selection is
111		shown. When written with any non-zero value, it clears
112		the boot code selection and the timeout counter, which results
113		in chipselect reset for AST2400/AST2500.
114