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References: <20230719-imx8mp_enet_qos_use_125mhz_clock-v2-1-eed15d74bfd1@pengutronix.de>
In-Reply-To: <20230719-imx8mp_enet_qos_use_125mhz_clock-v2-1-eed15d74bfd1@pengutronix.de>
From:   Fabio Estevam <festevam@gmail.com>
Date:   Fri, 21 Jul 2023 22:49:12 -0300
Message-ID: <CAOMZO5AxuMOmy_RwQ-HpTMJn7Lg9j6ytb6t0pMerQd+t0AG12Q@mail.gmail.com>
Subject: Re: [PATCH v2] arm64: dts: imx8mp: use correct clock for eqos
 timestamping counter
To:     Johannes Zink <j.zink@pengutronix.de>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        NXP Linux Team <linux-imx@nxp.com>,
        patchwork-jzi@pengutronix.de, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
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On Fri, Jul 21, 2023 at 12:51=E2=80=AFAM 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>