Re: [PATCH 5/5] bus: mhi: host: mhi_phc: Add support for PHC over MHI

[Jakub Kicinski]

On Mon, 18 Aug 2025 12:25:50 +0530 Krishna Chaitanya Chundru wrote:
> This patch introduces the MHI PHC (PTP Hardware Clock) driver, which
> registers a PTP (Precision Time Protocol) clock and communicates with
> the MHI core to get the device side timestamps. These timestamps are
> then exposed to the PTP subsystem, enabling precise time synchronization
> between the host and the device.

> +static struct ptp_clock_info qcom_ptp_clock_info = {
> +	.owner    = THIS_MODULE,
> +	.gettimex64 =  qcom_ptp_gettimex64,
> +};

Yet another device to device clock sync driver. Please see the
discussion here:
https://lore.kernel.org/all/20250815113814.5e135318@xxxxxxxxxx/
I think we have a consensus within the community that we should 
stop cramming random clocks into the PTP subsystem.

Exporting read-only clocks from another processor is not what PTP
is for.