arm64: dts: allwinner: a64: sopine-baseboard: Add PHY regulator delay

BugLink: https://bugs.launchpad.net/bugs/1853208
[ Upstream commit ccdf3aaa27ded6db9a93eed3ca7468bb2353b8fe ]

It turns out that sopine-baseboard needs same fix as pine64-plus
for ethernet PHY. Here too Realtek ethernet PHY chip needs additional
power on delay to properly initialize. Datasheet mentions that chip
needs 30 ms to be properly powered on and that it needs some more time
to be initialized.

Fix that by adding 100ms ramp delay to regulator responsible for
powering PHY.

Note that issue was found out and fix tested on pine64-lts, but it's
basically the same as sopine-baseboard, only layout and connectors
differ.

Fixes: bdfe4cebea11 ("arm64: allwinner: a64: add Ethernet PHY regulator for several boards")
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-sopine-baseboard.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-sopine-baseboard.dts
index abe179de35d780cc1d3691394d465817dad30549..f29b0b3e8fa4600015c3abbf63b95a8e98e922ae 100644 (file)
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64-sopine-baseboard.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-sopine-baseboard.dts
@@ -113,6 +113,12 @@
 };
 
 &reg_dc1sw {
+       /*
+        * Ethernet PHY needs 30ms to properly power up and some more
+        * to initialize. 100ms should be plenty of time to finish
+        * whole process.
+        */
+       regulator-enable-ramp-delay = <100000>;
        regulator-name = "vcc-phy";
 };