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 only file. While reading, it gives '1' if that
21		device supports nowayout feature else, it gives '0'.
22
23What:		/sys/class/watchdog/watchdogn/state
24Date:		August 2015
25Contact:	Wim Van Sebroeck <wim@iguana.be>
26Description:
27		It is a read only file. It gives active/inactive status of
28		watchdog device.
29
30What:		/sys/class/watchdog/watchdogn/status
31Date:		August 2015
32Contact:	Wim Van Sebroeck <wim@iguana.be>
33Description:
34		It is a read only file. It contains watchdog device's
35		internal status bits. It is equivalent to WDIOC_GETSTATUS
36		of ioctl interface.
37
38What:		/sys/class/watchdog/watchdogn/timeleft
39Date:		August 2015
40Contact:	Wim Van Sebroeck <wim@iguana.be>
41Description:
42		It is a read only file. It contains value of time left for
43		reset generation. It is equivalent to WDIOC_GETTIMELEFT of
44		ioctl interface.
45
46What:		/sys/class/watchdog/watchdogn/timeout
47Date:		August 2015
48Contact:	Wim Van Sebroeck <wim@iguana.be>
49Description:
50		It is a read only file. It is read to know about current
51		value of timeout programmed.
52
53What:		/sys/class/watchdog/watchdogn/pretimeout
54Date:		December 2016
55Contact:	Wim Van Sebroeck <wim@iguana.be>
56Description:
57		It is a read only file. It specifies the time in seconds before
58		timeout when the pretimeout interrupt is delivered.  Pretimeout
59		is an optional feature.
60
61What:		/sys/class/watchdog/watchdogn/pretimeout_avaialable_governors
62Date:		February 2017
63Contact:	Wim Van Sebroeck <wim@iguana.be>
64Description:
65		It is a read only file. It shows the pretimeout governors
66		available for this watchdog.
67
68What:		/sys/class/watchdog/watchdogn/pretimeout_governor
69Date:		February 2017
70Contact:	Wim Van Sebroeck <wim@iguana.be>
71Description:
72		It is a read/write file. When read, the currently assigned
73		pretimeout governor is returned.  When written, it sets
74		the pretimeout governor.
75
76What:		/sys/class/watchdog/watchdog1/access_cs0
77Date:		August 2019
78Contact:	Ivan Mikhaylov <i.mikhaylov@yadro.com>,
79		Alexander Amelkin <a.amelkin@yadro.com>
80Description:
81		It is a read/write file. This attribute exists only if the
82		system has booted from the alternate flash chip due to
83		expiration of a watchdog timer of AST2400/AST2500 when
84		alternate boot function was enabled with 'aspeed,alt-boot'
85		devicetree option for that watchdog or with an appropriate
86		h/w strapping (for WDT2 only).
87
88		At alternate flash the 'access_cs0' sysfs node provides:
89			ast2400: a way to get access to the primary SPI flash
90				chip at CS0 after booting from the alternate
91				chip at CS1.
92			ast2500: a way to restore the normal address mapping
93				from (CS0->CS1, CS1->CS0) to (CS0->CS0,
94				CS1->CS1).
95
96		Clearing the boot code selection and timeout counter also
97		resets to the initial state the chip select line mapping. When
98		the SoC is in normal mapping state (i.e. booted from CS0),
99		clearing those bits does nothing for both versions of the SoC.
100		For alternate boot mode (booted from CS1 due to wdt2
101		expiration) the behavior differs as described above.
102
103		This option can be used with wdt2 (watchdog1) only.
104
105		When read, the current status of the boot code selection is
106		shown. When written with any non-zero value, it clears
107		the boot code selection and the timeout counter, which results
108		in chipselect reset for AST2400/AST2500.
109