linux-kernel - [PATCH] ARM64: dts: update MDIO speed and preamble for zii-ultra device

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Date:   Sat, 4 Jul 2020 18:26:19 -0700
From:   Chris Healy <cphealy@...il.com>
To:     Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Rob Herring <robh+dt@...nel.org>,
        devicetree@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH] ARM64: dts: update MDIO speed and preamble for zii-ultra device

Update MDIO configuration with zii-ultra device to fully utilize
MDIO endpoint capabilities.  Device supports 12.5MHz clock and
doesn't require MDIO preamble.

Signed-off-by: Chris Healy <cphealy@...il.com>
---
 arch/arm64/boot/dts/freescale/imx8mq-zii-ultra.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-zii-ultra.dtsi
b/arch/arm64/boot/dts/freescale/imx8mq-zii-ultra.dtsi
index 6a55165bd76a..98aa67a4c040 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-zii-ultra.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-zii-ultra.dtsi
@@ -132,6 +132,8 @@
         #address-cells = <1>;
         #size-cells = <0>;
         status = "okay";
+        suppress-preamble = <1>;
+        clock-frequency = <12500000>;

         switch: switch@0 {
             compatible = "marvell,mv88e6085";
-- 
2.21.3