1 What: /sys/class/watchdog/watchdogn/bootstatus
3 Contact: Wim Van Sebroeck <wim@iguana.be>
5 It is a read only file. It contains status of the watchdog
6 device at boot. It is equivalent to WDIOC_GETBOOTSTATUS of
9 What: /sys/class/watchdog/watchdogn/identity
11 Contact: Wim Van Sebroeck <wim@iguana.be>
13 It is a read only file. It contains identity string of
16 What: /sys/class/watchdog/watchdogn/nowayout
18 Contact: Wim Van Sebroeck <wim@iguana.be>
20 It is a read only file. While reading, it gives '1' if that
21 device supports nowayout feature else, it gives '0'.
23 What: /sys/class/watchdog/watchdogn/state
25 Contact: Wim Van Sebroeck <wim@iguana.be>
27 It is a read only file. It gives active/inactive status of
30 What: /sys/class/watchdog/watchdogn/status
32 Contact: Wim Van Sebroeck <wim@iguana.be>
34 It is a read only file. It contains watchdog device's
35 internal status bits. It is equivalent to WDIOC_GETSTATUS
38 What: /sys/class/watchdog/watchdogn/timeleft
40 Contact: Wim Van Sebroeck <wim@iguana.be>
42 It is a read only file. It contains value of time left for
43 reset generation. It is equivalent to WDIOC_GETTIMELEFT of
46 What: /sys/class/watchdog/watchdogn/timeout
48 Contact: Wim Van Sebroeck <wim@iguana.be>
50 It is a read only file. It is read to know about current
51 value of timeout programmed.
53 What: /sys/class/watchdog/watchdogn/pretimeout
55 Contact: Wim Van Sebroeck <wim@iguana.be>
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.
61 What: /sys/class/watchdog/watchdogn/pretimeout_avaialable_governors
63 Contact: Wim Van Sebroeck <wim@iguana.be>
65 It is a read only file. It shows the pretimeout governors
66 available for this watchdog.
68 What: /sys/class/watchdog/watchdogn/pretimeout_governor
70 Contact: Wim Van Sebroeck <wim@iguana.be>
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.
76 What: /sys/class/watchdog/watchdog1/access_cs0
78 Contact: Ivan Mikhaylov <i.mikhaylov@yadro.com>,
79 Alexander Amelkin <a.amelkin@yadro.com>
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).
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
92 ast2500: a way to restore the normal address mapping
93 from (CS0->CS1, CS1->CS0) to (CS0->CS0,
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.
103 This option can be used with wdt2 (watchdog1) only.
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.