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| author | Rob Herring (Arm) <robh@kernel.org> | 2026-08-31 14:43:51 -0500 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2026-09-13 18:17:31 -0700 |
| commit | 55fc280e951ab2b39f3dcb640edc1b1eebc6d173 (patch) | |
| tree | f0b5f37b42fc13b9908a31b657c646b024231cdd /Documentation/block/cmdline-partition.rst | |
| download | linux-stable-55fc280e951ab2b39f3dcb640edc1b1eebc6d173.tar.gz linux-stable-55fc280e951ab2b39f3dcb640edc1b1eebc6d173.zip | |
Input: tsc2007 - read "ti,poll-period" as u32grafted
The "ti,poll-period" property is documented as a normal uint32 cell.
The driver used a u64 helper, which makes the helper type disagree with
the schema even though the stored value is still small.
Read "ti,poll-period" with the u32 helper matching the documented DT
cell size.
Assisted-by: Codex:gpt-5-5
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260831194352.1185860-1-robh@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'Documentation/block/cmdline-partition.rst')
| -rw-r--r-- | Documentation/block/cmdline-partition.rst | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/Documentation/block/cmdline-partition.rst b/Documentation/block/cmdline-partition.rst new file mode 100644 index 000000000..526ba201d --- /dev/null +++ b/Documentation/block/cmdline-partition.rst @@ -0,0 +1,56 @@ +============================================== +Embedded device command line partition parsing +============================================== + +The "blkdevparts" command line option adds support for reading the +block device partition table from the kernel command line. + +It is typically used for fixed block (eMMC) embedded devices. +It has no MBR, so saves storage space. Bootloader can be easily accessed +by absolute address of data on the block device. +Users can easily change the partition. + +The format for the command line is just like mtdparts: + +blkdevparts=<blkdev-def>[;<blkdev-def>] + <blkdev-def> := <blkdev-id>:<partdef>[,<partdef>] + <partdef> := <size>[@<offset>](part-name) + +<blkdev-id> + block device disk name. Embedded device uses fixed block device. + Its disk name is also fixed, such as: mmcblk0, mmcblk1, mmcblk0boot0. + +<size> + partition size, in bytes, such as: 512, 1m, 1G. + size may contain an optional suffix of (upper or lower case): + + K, M, G, T, P, E. + + "-" is used to denote all remaining space. + +<offset> + partition start address, in bytes. + offset may contain an optional suffix of (upper or lower case): + + K, M, G, T, P, E. + +(part-name) + partition name. Kernel sends uevent with "PARTNAME". Application can + create a link to block device partition with the name "PARTNAME". + User space application can access partition by partition name. + +ro + read-only. Flag the partition as read-only. + +Example: + + eMMC disk names are "mmcblk0" and "mmcblk0boot0". + + bootargs:: + + 'blkdevparts=mmcblk0:1G(data0),1G(data1),-;mmcblk0boot0:1m(boot)ro,-(kernel)' + + dmesg:: + + mmcblk0: p1(data0) p2(data1) p3() + mmcblk0boot0: p1(boot) p2(kernel) |
