Messages in this thread | | | Date | Mon, 24 Jul 2023 14:42:51 +0200 | Subject | Re: [PATCH v2] arm64: dts: imx8mp: use correct clock for eqos timestamping counter | From | Johannes Zink <> |
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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@pengutronix.de> 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@pengutronix.de> > > Reviewed-by: Fabio Estevam <festevam@gmail.com> > >
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
-- Pengutronix e.K. | Johannes Zink | Steuerwalder Str. 21 | https://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686| Fax: +49-5121-206917-5555 |
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