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ARM: dts: sunxi: Banana Pi: increase startup-delay for the GMAC PHY regulator

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On the LeMaker Banana Pi, probing the external ethernet PHY connected
to the SoC's internal GMAC module sometimes fails. The PHY power
supply is handled via a GPIO-controlled regulator, and the existing
regulator startup-delay of 50000us is too short to make sure that the
PHY is always fully powered up when it is queried by phylib. Tests
have shown that to provide a reliable PHY detection, the startup-delay
has to be increased to at least 60000us. To have a certain safety margin
and to cater for manufacturing variations between different boards,
the delay gets set to 100000us as discussed on the linux-arm-kernel
mailinglist.

Signed-off-by: Karsten Merker <merker@debian.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
This commit is contained in:
Karsten Merker 2014-11-12 00:01:46 +01:00 committed by Maxime Ripard
parent 6379589856
commit 9ce42e46b1
1 changed files with 1 additions and 1 deletions
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2
arch/arm/boot/dts/sun7i-a20-bananapi.dts
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@ -207,7 +207,7 @@
regulator-name = "gmac-3v3";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
startup-delay-us = <50000>;
startup-delay-us = <100000>;
enable-active-high;
gpio = <&pio 7 23 0>;
};