1 What: /sys/class/watchdog/watchdogn/bootstatus 2 Date: August 2015 3 Contact: Wim Van Sebroeck <wim@iguana.be> 4 Description: 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 9 What: /sys/class/watchdog/watchdogn/options 10 Date: April 2023 11 Contact: Thomas Weißschuh 12 Description: 13 It is a read only file. It contains options of watchdog device. 14 15 What: /sys/class/watchdog/watchdogn/fw_version 16 Date: April 2023 17 Contact: Thomas Weißschuh 18 Description: 19 It is a read only file. It contains firmware version of 20 watchdog device. 21 22 What: /sys/class/watchdog/watchdogn/identity 23 Date: August 2015 24 Contact: Wim Van Sebroeck <wim@iguana.be> 25 Description: 26 It is a read only file. It contains identity string of 27 watchdog device. 28 29 What: /sys/class/watchdog/watchdogn/nowayout 30 Date: August 2015 31 Contact: Wim Van Sebroeck <wim@iguana.be> 32 Description: 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 41 What: /sys/class/watchdog/watchdogn/state 42 Date: August 2015 43 Contact: Wim Van Sebroeck <wim@iguana.be> 44 Description: 45 It is a read only file. It gives active/inactive status of 46 watchdog device. 47 48 What: /sys/class/watchdog/watchdogn/status 49 Date: August 2015 50 Contact: Wim Van Sebroeck <wim@iguana.be> 51 Description: 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 56 What: /sys/class/watchdog/watchdogn/timeleft 57 Date: August 2015 58 Contact: Wim Van Sebroeck <wim@iguana.be> 59 Description: 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 64 What: /sys/class/watchdog/watchdogn/timeout 65 Date: August 2015 66 Contact: Wim Van Sebroeck <wim@iguana.be> 67 Description: 68 It is a read only file. It is read to know about current 69 value of timeout programmed. 70 71 What: /sys/class/watchdog/watchdogn/pretimeout 72 Date: December 2016 73 Contact: Wim Van Sebroeck <wim@iguana.be> 74 Description: 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 79 What: /sys/class/watchdog/watchdogn/pretimeout_avaialable_governors 80 Date: February 2017 81 Contact: Wim Van Sebroeck <wim@iguana.be> 82 Description: 83 It is a read only file. It shows the pretimeout governors 84 available for this watchdog. 85 86 What: /sys/class/watchdog/watchdogn/pretimeout_governor 87 Date: February 2017 88 Contact: Wim Van Sebroeck <wim@iguana.be> 89 Description: 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 94 What: /sys/class/watchdog/watchdog1/access_cs0 95 Date: August 2019 96 Contact: Ivan Mikhaylov <i.mikhaylov@yadro.com>, 97 Alexander Amelkin <a.amelkin@yadro.com> 98 Description: 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.
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