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From: Jernej Skrabec <jernej.skrabec@siol.net>
To: mripard@kernel.org, wens@csie.org
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com,
	robh+dt@kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: dts: allwinner: a64: sopine-baseboard: Add PHY regulator delay
Date: Sun, 29 Sep 2019 10:52:59 +0200	[thread overview]
Message-ID: <20190929085259.76462-1-jernej.skrabec@siol.net> (raw)

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>
---
 .../boot/dts/allwinner/sun50i-a64-sopine-baseboard.dts      | 6 ++++++
 1 file changed, 6 insertions(+)

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 e6fb9683f213..25099202c52c 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64-sopine-baseboard.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-sopine-baseboard.dts
@@ -159,6 +159,12 @@
 };
 
 &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";
 };
 
-- 
2.23.0


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             reply	other threads:[~2019-09-29  8:53 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-29  8:52 Jernej Skrabec [this message]
2019-09-30 14:21 ` [PATCH] arm64: dts: allwinner: a64: sopine-baseboard: Add PHY regulator delay Maxime Ripard

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