[PATCH] ARM: dts: vf610-zii-dev-rev-b: Fix MDIO over clocking

[Andrew Lunn]

The ZII devel B board has two generations of Marvell Switches.  The
mv88e6352 supports an MDIO clock of 12MHz. However the older 88e6185
does not like 12MHz, and often fails to probe.

Reduce the clock speed to 5MHz, which seems to work reliably.

Cc: Chris Healy <cphealy at gmail.com>
Fixes: b955387667ec ("ARM: dts: ZII: update MDIO speed and preamble")
Signed-off-by: Andrew Lunn <andrew at lunn.ch>
---
 arch/arm/boot/dts/vf610-zii-dev-rev-b.dts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/boot/dts/vf610-zii-dev-rev-b.dts b/arch/arm/boot/dts/vf610-zii-dev-rev-b.dts
index e500911ce0a5..6f1e0f0d4f0a 100644
--- a/arch/arm/boot/dts/vf610-zii-dev-rev-b.dts
+++ b/arch/arm/boot/dts/vf610-zii-dev-rev-b.dts
@@ -406,6 +406,9 @@ i2c at 4 {
 	};
 };
 
+&mdio1 {
+	clock-frequency = <5000000>;
+};
 
 &iomuxc {
 	pinctrl_gpio_e6185_eeprom_sel: pinctrl-gpio-e6185-eeprom-spi0 {
-- 
2.28.0