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

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

Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@altera.com>
---
 Documentation/ABI/testing/sysfs-bus-i3c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-i3c b/Documentation/ABI/testing/sysfs-bus-i3c
index c812ab180ff4..d75339330067 100644
--- a/Documentation/ABI/testing/sysfs-bus-i3c
+++ b/Documentation/ABI/testing/sysfs-bus-i3c
@@ -161,3 +161,14 @@ Contact:	linux-i3c@vger.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@vger.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.
+
+		Valid values: 0-3
-- 
2.49.GIT

On Fri, Nov 21, 2025 at 02:21:48PM +0800, adrianhoyin.ng@altera.com wrote:
> From: Adrian Ng Ho Yin <adrianhoyin.ng@altera.com>
>
> Document sysfs attribute dev_nack_retry_cnt that controls the number of
> automatic retries performed by the DesignWare I3C controller when a target
> device returns a NACK
>
> Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@altera.com>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  Documentation/ABI/testing/sysfs-bus-i3c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-i3c b/Documentation/ABI/testing/sysfs-bus-i3c
> index c812ab180ff4..d75339330067 100644
> --- a/Documentation/ABI/testing/sysfs-bus-i3c
> +++ b/Documentation/ABI/testing/sysfs-bus-i3c
> @@ -161,3 +161,14 @@ Contact:	linux-i3c@vger.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@vger.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.
> +
> +		Valid values: 0-3
> --
> 2.49.GIT
>
>
> --
> linux-i3c mailing list
> linux-i3c@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-i3c

On Fri, Nov 21, 2025 at 02:21:48PM +0800, adrianhoyin.ng@altera.com wrote:
> From: Adrian Ng Ho Yin <adrianhoyin.ng@altera.com>
>
> Document sysfs attribute dev_nack_retry_cnt that controls the number of
> automatic retries performed by the DesignWare I3C controller when a target
> device returns a NACK

Maybe other controller also support this feature, remove 'DesignWare'.

Add

Exist only when I3C constroller support this feature.

Frank
>
> Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@altera.com>
> ---
>  Documentation/ABI/testing/sysfs-bus-i3c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-i3c b/Documentation/ABI/testing/sysfs-bus-i3c
> index c812ab180ff4..d75339330067 100644
> --- a/Documentation/ABI/testing/sysfs-bus-i3c
> +++ b/Documentation/ABI/testing/sysfs-bus-i3c
> @@ -161,3 +161,14 @@ Contact:	linux-i3c@vger.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@vger.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.
> +
> +		Valid values: 0-3
> --
> 2.49.GIT
>