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