linux-kernel - [PATCH v3 8/8] ABI: sysfs-driver-ufs: Add missing UFS sysfs attributes

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Message-Id: <20250203081109.1614395-9-quic_ziqichen@quicinc.com>
Date: Mon,  3 Feb 2025 16:11:09 +0800
From: Ziqi Chen <quic_ziqichen@...cinc.com>
To: quic_cang@...cinc.com, bvanassche@....org, mani@...nel.org,
        beanhuo@...ron.com, avri.altman@....com, junwoo80.lee@...sung.com,
        martin.petersen@...cle.com, quic_ziqichen@...cinc.com,
        quic_nguyenb@...cinc.com, quic_nitirawa@...cinc.com,
        quic_rampraka@...cinc.com
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
        Keoseong Park <keosung.park@...sung.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 8/8] ABI: sysfs-driver-ufs: Add missing UFS sysfs attributes

Add UFS driver sysfs attributes clkscale_enable, clkgate_enable and
clkgate_delay_ms to this doucment.

Signed-off-by: Ziqi Chen <quic_ziqichen@...cinc.com>
---
v1 -> v2:
It is a new patch be added to this series since v2.

v2 -> v3:
1. Typo fixed for commit message.
2. Improve the grammar of attributes' descriptions.
---
 Documentation/ABI/testing/sysfs-driver-ufs | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
index 5fa6655aee84..9b1e22416346 100644
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -1559,3 +1559,36 @@ Description:
 		Symbol - HCMID. This file shows the UFSHCD manufacturer id.
 		The Manufacturer ID is defined by JEDEC in JEDEC-JEP106.
 		The file is read only.
+
+What:		/sys/bus/platform/drivers/ufshcd/*/clkscale_enable
+What:		/sys/bus/platform/devices/*.ufs/clkscale_enable
+Date:		January 2025
+Contact:	Ziqi Chen <quic_ziqichen@...cinc.com>
+Description:
+		This file shows whether the UFS clock scaling is enabled or not.
+		And it can be used to enable/disable the clock scaling by writing
+		1 or 0 to this file.
+
+		The file is read/write.
+
+What:		/sys/bus/platform/drivers/ufshcd/*/clkgate_enable
+What:		/sys/bus/platform/devices/*.ufs/clkgate_enable
+Date:		January 2025
+Contact:	Ziqi Chen <quic_ziqichen@...cinc.com>
+Description:
+		This file shows whether the UFS clock gating is enabled or not.
+		And it can be used to enable/disable the clock gating by writing
+		1 or 0 to this file.
+
+		The file is read/write.
+
+What:		/sys/bus/platform/drivers/ufshcd/*/clkgate_delay_ms
+What:		/sys/bus/platform/devices/*.ufs/clkgate_delay_ms
+Date:		January 2025
+Contact:	Ziqi Chen <quic_ziqichen@...cinc.com>
+Description:
+		This file shows and sets the number of milliseconds of idle time
+		before the UFS driver start to perform clock gating. This can
+		prevent the UFS from frequently performing clock gate/ungate.
+
+		The file is read/write.
-- 
2.34.1