[RFC PATCH v2.2 17/17] Docs/ABI/damon: document probe prep sysfs files

Update DAMON ABI document for the newly added DAMON probe prep sysfs
files.

Signed-off-by: SJ Park <[email protected]>
---
 Documentation/ABI/testing/sysfs-kernel-mm-damon | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-damon b/Documentation/ABI/testing/sysfs-kernel-mm-damon
index e675a57145e36..f8d2601e82904 100644
--- a/Documentation/ABI/testing/sysfs-kernel-mm-damon
+++ b/Documentation/ABI/testing/sysfs-kernel-mm-damon
@@ -173,6 +173,19 @@ Contact:	SJ Park <[email protected]>
 Description:	Writing to and reading from this file sets and gets the
 		per-probe attribute weight.
 
+What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/probes/<P>/preps/nr_preps
+Date:		Jun 2026
+Contact:	SJ Park <[email protected]>
+Description:	Writing a number 'N' to this file creates the number of
+		directories for each DAMON probing preparation action named '0'
+		to 'N-1' under the preps/ directory.
+
+What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/probes/<P>/preps/<R>/prep_action
+Date:		Jun 2026
+Contact:	SJ Park <[email protected]>
+Description:	Writing to and reading from this file sets and gets the probing
+		preparation action.
+
 What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/probes/<P>/filters/nr_filters
 Date:		May 2026
 Contact:	SJ Park <[email protected]>
-- 
2.47.3