[RFC PATCH 3/9] Documentation/scrub-configure.rst: Add documentation for scrub driver

[<shiju.jose@huawei.com>]

From: Shiju Jose <shiju.jose@huawei.com>

Add documentation for scrub driver, supports configure scrub parameters,
in Documentation/scrub-configure.rst

Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
---
 Documentation/scrub-configure.rst | 55 +++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/scrub-configure.rst

diff --git a/Documentation/scrub-configure.rst b/Documentation/scrub-configure.rst
new file mode 100644
index 000000000000..9f8581b88788
--- /dev/null
+++ b/Documentation/scrub-configure.rst
@@ -0,0 +1,55 @@
+==========================
+Scrub subsystem driver
+==========================
+
+Copyright (c) 2023 HiSilicon Limited.
+
+:Author:   Shiju Jose <shiju.jose@huawei.com>
+:License:  The GNU Free Documentation License, Version 1.2
+          (dual licensed under the GPL v2)
+:Original Reviewers:
+
+- Written for: 6.7
+- Updated for:
+
+Introduction
+------------
+The scrub subsystem driver provides the interface for configure the
+parameters of memory scrubbers in the system. The scrub device drivers
+in the system register with the scrub configure subsystem.
+
+The scrub configure driver exposes the scrub controls to the user
+via sysfs.
+
+The File System
+---------------
+
+The configuration parameters of the registered scrubbers could be
+accessed via the /sys/class/scrub/scrubX/regionN/
+
+sysfs
+-----
+
+Sysfs files are documented in
+`Documentation/ABI/testing/sysfs-class-scrub-configure`.
+
+Example
+-------
+
+  The usage takes the form shown in this example::
+
+    # echo 0x300000 > /sys/class/scrub/scrub0/region0/addr_base
+    # echo 0x100000 > /sys/class/scrub/scrub0/region0/addr_size
+    # cat /sys/class/scrub/scrub0/region0/speed_available
+    # 1-60
+    # echo 25 > /sys/class/scrub/scrub0/region0/speed
+    # echo 1 > /sys/class/scrub/scrub0/region0/enable
+
+    # cat /sys/class/scrub/scrub0/region0/speed
+    # 0x19
+    # cat /sys/class/scrub/scrub0/region0/addr_base
+    # 0x100000
+    # cat /sys/class/scrub/scrub0/region0/addr_size
+    # 0x200000
+
+    # echo 0 > /sys/class/scrub/scrub0/region0/enable
-- 
2.34.1