Create DT binding document for blkoops. Signed-off-by: liaoweixiong <liaoweixi...@allwinnertech.com> --- .../devicetree/bindings/pstore/blkoops.txt | 53 ++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 54 insertions(+) create mode 100644 Documentation/devicetree/bindings/pstore/blkoops.txt
diff --git a/Documentation/devicetree/bindings/pstore/blkoops.txt b/Documentation/devicetree/bindings/pstore/blkoops.txt new file mode 100644 index 0000000..5462915 --- /dev/null +++ b/Documentation/devicetree/bindings/pstore/blkoops.txt @@ -0,0 +1,53 @@ +Blkoops oops logger +=================== + +Blkoops provides a block partition for oops, excluding panics now, so they can +be recovered after a reboot. + +Any space of block device will be used for a circular buffer of oops records. +These records have a configurable size, with a size of 0 indicating that they +should be disabled. + +At least one of "block-device" and "total_size" must be set. + +At least one of "dmesg-size" or "pmsg-size" must be set non-zero. + +Required properties: + +- compatible: must be "blkoops". + +Optional properties: + +- block-device: The block device to use. Most of the time, it is a partition of + device. If block-device is NULL, no block device is effective + and the data will be lost after rebooting. + It accept the following variants: + 1) <hex_major><hex_minor> device number in hexadecimal + represents itself no leading 0x, for example b302. + 2) /dev/<disk_name> represents the device number of disk + 3) /dev/<disk_name><decimal> represents the device number of + partition - device number of disk plus the partition number + 4) /dev/<disk_name>p<decimal> - same as the above, that form is + used when disk name of partitioned disk ends on a digit. + 5) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing + the unique id of a partition if the partition table provides + it. The UUID may be either an EFI/GPT UUID, or refer to an + MSDOS partition using the format SSSSSSSS-PP, where SSSSSSSS + is a zero-filled hex representation of the 32-bit + "NT disk signature", and PP is a zero-filled hex + representation of the 1-based partition number. + 6) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in + relation to a partition with a known unique id. + 7) <major>:<minor> major and minor number of the device + separated by a colon. + +- total-size: The total size in kbytes pstore/blk can use. It must be a multiple + of 4. It must be less than or equal to size of block-device. If + total-size is zero with block-devce valid, it will be set to equal + to size of block-device. + +- dmesg-size: maximum size in kbytes of each dump done on oops, which must be a + multiple of 4. + +- pmsg-size: maximum size in kbytes for userspace messages, which must be a + multiple of 4. diff --git a/MAINTAINERS b/MAINTAINERS index 51029a4..f49dd37 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12318,6 +12318,7 @@ F: drivers/firmware/efi/efi-pstore.c F: drivers/acpi/apei/erst.c F: Documentation/admin-guide/ramoops.rst F: Documentation/devicetree/bindings/reserved-memory/ramoops.txt +F: Documentation/devicetree/bindings/pstore-block/ K: \b(pstore|ramoops) PTP HARDWARE CLOCK SUPPORT -- 1.9.1
