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 95 ast2400: 96 a way to get access to the primary SPI flash 97 chip at CS0 after booting from the alternate 98 chip at CS1. 99 ast2500: 100 a way to restore the normal address mapping 101 from (CS0->CS1, CS1->CS0) to (CS0->CS0, 102 CS1->CS1). 103 104 Clearing the boot code selection and timeout counter also 105 resets to the initial state the chip select line mapping. When 106 the SoC is in normal mapping state (i.e. booted from CS0), 107 clearing those bits does nothing for both versions of the SoC. 108 For alternate boot mode (booted from CS1 due to wdt2 109 expiration) the behavior differs as described above. 110 111 This option can be used with wdt2 (watchdog1) only. 112 113 When read, the current status of the boot code selection is 114 shown. When written with any non-zero value, it clears 115 the boot code selection and the timeout counter, which results 116 in chipselect reset for AST2400/AST2500. 117