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

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Date:   Fri, 21 Jul 2023 22:49:12 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Johannes Zink <j.zink@...gutronix.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        patchwork-jzi@...gutronix.de, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: imx8mp: use correct clock for eqos
 timestamping counter

On Fri, Jul 21, 2023 at 12:51 AM Johannes Zink <j.zink@...gutronix.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@...gutronix.de>

Reviewed-by: Fabio Estevam <festevam@...il.com>