linux-kernel - [PATCH v3 1/3] i3c: add sysfs entry for Device NACK Retry count

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Message-ID: <6ad1cc6cc835ddb01cc179f91cb9a8bd2eb5153d.1763747151.git.adrianhoyin.ng@altera.com>
Date: Sat, 22 Nov 2025 02:00:39 +0800
From: adrianhoyin.ng@...era.com
To: alexandre.belloni@...tlin.com,
	Frank.Li@....com,
	linux-i3c@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: adrianhoyin.ng@...era.com
Subject: [PATCH v3 1/3] i3c: add sysfs entry for Device NACK Retry count

From: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>

Document sysfs attribute dev_nack_retry_cnt that controls the number of
automatic retries performed by the I3C controller when a target device
returns a NACK

Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>
---
 Documentation/ABI/testing/sysfs-bus-i3c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-i3c b/Documentation/ABI/testing/sysfs-bus-i3c
index c812ab180ff4..0b8a0c223f4a 100644
--- a/Documentation/ABI/testing/sysfs-bus-i3c
+++ b/Documentation/ABI/testing/sysfs-bus-i3c
@@ -161,3 +161,15 @@ Contact:	linux-i3c@...r.kernel.org
 Description:
 		These directories are just symbolic links to
 		/sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>.
+
+What:		/sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/dev_nack_retry_count
+KernelVersion:  6.18
+Contact:	linux-i3c@...r.kernel.org
+Description:
+		Expose the dev_nak_retry_count which controls the number of
+		automatic retries that will be performed by the controller when
+		the target device returns a NACK response. A value of 0 disables
+		the automatic retries. A max value of 3 can be configured. Exist
+		only when I3C constroller supports this retry on nack feature.
+
+		Valid values: 0-3
-- 
2.49.GIT