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

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@gmail.com>
Fixes: b955387667ec ("ARM: dts: ZII: update MDIO speed and preamble")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Chris Healy <cphealy@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

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 e500911ce0a5910d908d1d4ba67b39a14fae58e5..6f1e0f0d4f0aeac691de5f16325e26b7396f0906 100644 (file)
--- 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 @@
        };
 };
 
+&mdio1 {
+       clock-frequency = <5000000>;
+};
 
 &iomuxc {
        pinctrl_gpio_e6185_eeprom_sel: pinctrl-gpio-e6185-eeprom-spi0 {