[PATCH v6 2/6] docs: ABI: Add wb_on documentation for UFS sysfs

[Bean Huo]

From: Bean Huo <beanhuo@xxxxxxxxxx>

Adds UFS sysfs documentation for new entry wb_on.

Signed-off-by: Bean Huo <beanhuo@xxxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-driver-ufs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
index adc0d0e91607..f0a1ac385c7f 100644
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -1153,3 +1153,11 @@ Description:	This entry shows the configured size of WriteBooster buffer.
 		0400h corresponds to 4GB.
 
 		The file is read only.
+
+What:		/sys/bus/platform/drivers/ufshcd/*/wb_on
+Date:		January 2021
+Contact:	Bean Huo <beanhuo@xxxxxxxxxx>
+Description:	This node is used to set or display whether UFS WriteBooster is
+        enabled. Echo 0 to this file to disable UFS WriteBooster or 1 to enable
+        it. Note, this is only allowed for the platform doesen't support
+        UFSHCD_CAP_CLK_SCALING.
-- 
2.17.1