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Subject[PATCH 5.4 007/453] ARM: dts: sun7i: pcduino3-nano: enable RGMII RX/TX delay on PHY
Date
From: Adam Sampson <ats@offog.org>

[ Upstream commit a7361b9c4615951f52ffd2b1afa09a1384c7b4e4 ]

The RX/TX delays for the Ethernet PHY on the Linksprite pcDuino 3 Nano
are configured in hardware, using resistors that are populated to pull
the RTL8211E's RXDLY/TXDLY pins low or high as needed.

phy-mode should be set to rgmii-id to reflect this. Previously it was
set to rgmii, which used to work but now results in the delays being
disabled again as a result of the bugfix in commit bbc4d71d6354 ("net:
phy: realtek: fix rtl8211e rx/tx delay config").

Tested on two pcDuino 3 Nano boards purchased in 2015. Without this fix,
Ethernet works unreliably on one board and doesn't work at all on the
other.

Fixes: 061035d456c9 ("ARM: dts: sun7i: Add dts file for pcDuino 3 Nano board")
Signed-off-by: Adam Sampson <ats@offog.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20201123174739.6809-1-ats@offog.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm/boot/dts/sun7i-a20-pcduino3-nano.dts | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/sun7i-a20-pcduino3-nano.dts b/arch/arm/boot/dts/sun7i-a20-pcduino3-nano.dts
index fce2f7fcd084a..bf38c66c1815b 100644
--- a/arch/arm/boot/dts/sun7i-a20-pcduino3-nano.dts
+++ b/arch/arm/boot/dts/sun7i-a20-pcduino3-nano.dts
@@ -1,5 +1,5 @@
/*
- * Copyright 2015 Adam Sampson <ats@offog.org>
+ * Copyright 2015-2020 Adam Sampson <ats@offog.org>
*
* This file is dual-licensed: you can use it either under the terms
* of the GPL or the X11 license, at your option. Note that this dual
@@ -115,7 +115,7 @@
pinctrl-names = "default";
pinctrl-0 = <&gmac_rgmii_pins>;
phy-handle = <&phy1>;
- phy-mode = "rgmii";
+ phy-mode = "rgmii-id";
status = "okay";
};

--
2.27.0


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