Re: [PATCH v2] arm64: dts: imx8mp: use correct clock for eqos timestamping counter

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Hi everyone,

On 7/22/23 03:49, Fabio Estevam wrote:
On Fri, Jul 21, 2023 at 12:51 AM Johannes Zink <j.zink@xxxxxxxxxxxxxx> wrote:

The i.MX8MP Reference Manual rev 1 06/2021, section 11.7.2.5 "Timestamp
Support" indicates the PTP timestamp clock expects a typical frequency
of 125MHz.

As this also improves the precision of the measured timestamps: assign
appropriate 125MHz Clock parent. As no one except the timestamping
counter uses this clock, there are no side-effects of this change in
other peripherals.

Signed-off-by: Johannes Zink <j.zink@xxxxxxxxxxxxxx>

Reviewed-by: Fabio Estevam <festevam@xxxxxxxxx>



please scratch this patch, the PTP Timestamping clock cannot be supplied with a 125MHz clock, there is no 125MHz source in the MUX input and I misinterpreted the clocksummary when testing this patch.

Sorry for the noise,
Johannes


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