arm64: dts: allwinner: a64: pine64-plus: Add PHY regulator delay

[ Upstream commit 2511366797fa6ab4a404b4b000ef7cd262aaafe8 ]

Depending on kernel and bootloader configuration, it's possible that
Realtek ethernet PHY isn't powered on properly. According to the
datasheet, it needs 30ms to power up and then some more time before it
can be used.

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

Fixes: 94dcfdc7 ("arm64: allwinner: pine64-plus: Enable dwmac-sun8i")
Suggested-by: NOndrej Jirman <megous@megous.com>
Signed-off-by: NJernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: NMaxime Ripard <mripard@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>

arch/arm64/boot/dts/allwinner/sun50i-a64-pine64-plus.dts

@@ -63,3 +63,12 @@
 		reg = <1>;
 	};
 };
+
+&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>;
+};