From: Andrew Lunn <andrew@lunn.ch>
Date: Fri, 30 Oct 2020 00:55:28 +0000 (+0100)
Subject: ARM: dts: vf610-zii-dev-rev-b: Fix MDIO over clocking
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f8b5a33707c9a19ec905d2826be0acd151997a09;p=linux.git

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 e500911ce0a59..6f1e0f0d4f0ae 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 @@
 	};
 };
 
+&mdio1 {
+	clock-frequency = <5000000>;
+};
 
 &iomuxc {
 	pinctrl_gpio_e6185_eeprom_sel: pinctrl-gpio-e6185-eeprom-spi0 {