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/options
10Date:		April 2023
11Contact:	Thomas Weißschuh
12Description:
13		It is a read only file. It contains options of watchdog device.
14
15What:		/sys/class/watchdog/watchdogn/fw_version
16Date:		April 2023
17Contact:	Thomas Weißschuh
18Description:
19		It is a read only file. It contains firmware version of
20		watchdog device.
21
22What:		/sys/class/watchdog/watchdogn/identity
23Date:		August 2015
24Contact:	Wim Van Sebroeck <wim@iguana.be>
25Description:
26		It is a read only file. It contains identity string of
27		watchdog device.
28
29What:		/sys/class/watchdog/watchdogn/nowayout
30Date:		August 2015
31Contact:	Wim Van Sebroeck <wim@iguana.be>
32Description:
33		It is a read/write file. While reading, it gives '1'
34		if the device has the nowayout feature set, otherwise
35		it gives '0'. Writing a '1' to the file enables the
36		nowayout feature. Once set, the nowayout feature
37		cannot be disabled, so writing a '0' either has no
38		effect (if the feature was already disabled) or
39		results in a permission error.
40
41What:		/sys/class/watchdog/watchdogn/state
42Date:		August 2015
43Contact:	Wim Van Sebroeck <wim@iguana.be>
44Description:
45		It is a read only file. It gives active/inactive status of
46		watchdog device.
47
48What:		/sys/class/watchdog/watchdogn/status
49Date:		August 2015
50Contact:	Wim Van Sebroeck <wim@iguana.be>
51Description:
52		It is a read only file. It contains watchdog device's
53		internal status bits. It is equivalent to WDIOC_GETSTATUS
54		of ioctl interface.
55
56What:		/sys/class/watchdog/watchdogn/timeleft
57Date:		August 2015
58Contact:	Wim Van Sebroeck <wim@iguana.be>
59Description:
60		It is a read only file. It contains value of time left for
61		reset generation. It is equivalent to WDIOC_GETTIMELEFT of
62		ioctl interface.
63
64What:		/sys/class/watchdog/watchdogn/timeout
65Date:		August 2015
66Contact:	Wim Van Sebroeck <wim@iguana.be>
67Description:
68		It is a read only file. It is read to know about current
69		value of timeout programmed.
70
71What:		/sys/class/watchdog/watchdogn/pretimeout
72Date:		December 2016
73Contact:	Wim Van Sebroeck <wim@iguana.be>
74Description:
75		It is a read only file. It specifies the time in seconds before
76		timeout when the pretimeout interrupt is delivered.  Pretimeout
77		is an optional feature.
78
79What:		/sys/class/watchdog/watchdogn/pretimeout_avaialable_governors
80Date:		February 2017
81Contact:	Wim Van Sebroeck <wim@iguana.be>
82Description:
83		It is a read only file. It shows the pretimeout governors
84		available for this watchdog.
85
86What:		/sys/class/watchdog/watchdogn/pretimeout_governor
87Date:		February 2017
88Contact:	Wim Van Sebroeck <wim@iguana.be>
89Description:
90		It is a read/write file. When read, the currently assigned
91		pretimeout governor is returned.  When written, it sets
92		the pretimeout governor.
93
94What:		/sys/class/watchdog/watchdog1/access_cs0
95Date:		August 2019
96Contact:	Ivan Mikhaylov <i.mikhaylov@yadro.com>,
97		Alexander Amelkin <a.amelkin@yadro.com>
98Description:
99		It is a read/write file. This attribute exists only if the
100		system has booted from the alternate flash chip due to
101		expiration of a watchdog timer of AST2400/AST2500 when
102		alternate boot function was enabled with 'aspeed,alt-boot'
103		devicetree option for that watchdog or with an appropriate
104		h/w strapping (for WDT2 only).
105
106		At alternate flash the 'access_cs0' sysfs node provides:
107
108			ast2400:
109				a way to get access to the primary SPI flash
110				chip at CS0 after booting from the alternate
111				chip at CS1.
112			ast2500:
113				a way to restore the normal address mapping
114				from (CS0->CS1, CS1->CS0) to (CS0->CS0,
115				CS1->CS1).
116
117		Clearing the boot code selection and timeout counter also
118		resets to the initial state the chip select line mapping. When
119		the SoC is in normal mapping state (i.e. booted from CS0),
120		clearing those bits does nothing for both versions of the SoC.
121		For alternate boot mode (booted from CS1 due to wdt2
122		expiration) the behavior differs as described above.
123
124		This option can be used with wdt2 (watchdog1) only.
125
126		When read, the current status of the boot code selection is
127		shown. When written with any non-zero value, it clears
128		the boot code selection and the timeout counter, which results
129		in chipselect reset for AST2400/AST2500.
130