projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 33b71126 PA |
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 | ||
| ad8bc199 TW |
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 | ||
| b852e7a4 TW |
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 | ||
| 33b71126 PA |
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: | |
| bc44fa73 RV |
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. | |
| 33b71126 PA |
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. | |
| d02d104e JH |
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. | |
| ebdc0f58 IM |
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: | |
| 54a19b4d MCC |
107 | |
| 108 | ast2400: | |
| 109 | a way to get access to the primary SPI flash | |
| ebdc0f58 IM |
110 | chip at CS0 after booting from the alternate |
| 111 | chip at CS1. | |
| 54a19b4d MCC |
112 | ast2500: |
| 113 | a way to restore the normal address mapping | |
| ebdc0f58 IM |
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. |