linux-kernel - Re: [PATCH v2 1/3] i3c: add sysfs entry for Device NACK Retry count

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Message-ID: <aSCY+EIdl8RpMYSV@lizhi-Precision-Tower-5810>
Date: Fri, 21 Nov 2025 11:53:12 -0500
From: Frank Li <Frank.li@....com>
To: adrianhoyin.ng@...era.com
Cc: alexandre.belloni@...tlin.com, linux-i3c@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] i3c: add sysfs entry for Device NACK Retry count

On Fri, Nov 21, 2025 at 02:21:48PM +0800, adrianhoyin.ng@...era.com wrote:
> 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 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@...era.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@...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.
> +
> +		Valid values: 0-3
> --
> 2.49.GIT
>