linux-kernel - [PATCH v7 2/6] docs: ABI: Add wb_on documentation for new entry wb

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Message-Id: <20210119163847.20165-3-huobean@gmail.com>
Date:   Tue, 19 Jan 2021 17:38:43 +0100
From:   Bean Huo <huobean@...il.com>
To:     alim.akhtar@...sung.com, avri.altman@....com,
        asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        cang@...eaurora.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v7 2/6] docs: ABI: Add wb_on documentation for new entry wb_on

From: Bean Huo <beanhuo@...ron.com>

Adds UFS sysfs documentation for new entry wb_on.

Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 Documentation/ABI/testing/sysfs-driver-ufs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
index adc0d0e91607..f756fd0eba19 100644
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -1153,3 +1153,14 @@ 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@...ron.com>
+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. The WriteBooster is enabled after power-on/reset, however, it will
+        be disabled/enable while CLK scaling down/up (if the platform supports
+        UFSHCD_CAP_CLK_SCALING). For a platform that doesn't support
+        UFSHCD_CAP_CLK_SCALING, we can disable/enable WriteBooster through this
+        sysfs node.
-- 
2.17.1