This is a note to let you know that I've just added the patch titled
ARM: dts: vf610-zii-dev-rev-b: Fix MDIO over clocking
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-dts-vf610-zii-dev-rev-b-fix-mdio-over-clocking.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5c7c5c7877f8838b1cbc3fe5446f7676d35a3fd1
Author: Andrew Lunn <andrew@xxxxxxx>
Date: Fri Oct 30 01:55:28 2020 +0100
ARM: dts: vf610-zii-dev-rev-b: Fix MDIO over clocking
[ Upstream commit f8b5a33707c9a19ec905d2826be0acd151997a09 ]
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@xxxxxxxxx>
Fixes: b955387667ec ("ARM: dts: ZII: update MDIO speed and preamble")
Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
Reviewed-by: Chris Healy <cphealy@xxxxxxxxx>
Signed-off-by: Shawn Guo <shawnguo@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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 {
