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 <cphe...@gmail.com>
---
v2:
- Fix subject line to reference zii-ultra:
- Get rid of "=<1>;" from suppress-preamble lines

 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;
+               clock-frequency = <12500000>;
 
                switch: switch@0 {
                        compatible = "marvell,mv88e6085";
-- 
2.21.3

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