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

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Message-Id: <20230719-imx8mp_enet_qos_use_125mhz_clock-v1-1-782c9ac6e121@pengutronix.de>
Date:   Wed, 19 Jul 2023 15:59:19 +0200
From:   Johannes Zink <j.zink@...gutronix.de>
To:     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>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     patchwork-jzi@...gutronix.de, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Johannes Zink <j.zink@...gutronix.de>
Subject: [PATCH] arm64: dts: imx8mp: use correct clock for eqos
 timestamping counter

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>
---
 arch/arm64/boot/dts/freescale/imx8mp.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
index 6f2f50e1639c..7f80dff914c2 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
@@ -1334,7 +1334,7 @@ eqos: ethernet@...f0000 {
 						  <&clk IMX8MP_CLK_ENET_QOS_TIMER>,
 						  <&clk IMX8MP_CLK_ENET_QOS>;
 				assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_266M>,
-							 <&clk IMX8MP_SYS_PLL2_100M>,
+							 <&clk IMX8MP_SYS_PLL2_125M>,
 							 <&clk IMX8MP_SYS_PLL2_125M>;
 				assigned-clock-rates = <0>, <100000000>, <125000000>;
 				nvmem-cells = <&eth_mac2>;

---
base-commit: ba345b77fae7054d0cbd033283c47033e45db6d8
change-id: 20230719-imx8mp_enet_qos_use_125mhz_clock-1c4611c979ba

Best regards,
-- 
Johannes Zink <j.zink@...gutronix.de>