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From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: linux-amlogic@lists.infradead.org, khilman@baylibre.com
Cc: andrew@lunn.ch,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	netdev@vger.kernel.org, linus.walleij@linaro.org,
	linux-kernel@vger.kernel.org, robin.murphy@arm.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 4/4] arm64: dts: meson: g12b: odroid-n2: add the Ethernet PHY reset line
Date: Wed, 12 Jun 2019 22:55:29 +0200
Message-ID: <20190612205529.19834-5-martin.blumenstingl@googlemail.com> (raw)
In-Reply-To: <20190612205529.19834-1-martin.blumenstingl@googlemail.com>

The reset line of the RTL8211F PHY is routed to the GPIOZ_15 pad.
Describe this in the device tree so the PHY framework can bring the PHY
into a known state when initializing it. GPIOZ_15 doesn't support
driving the output HIGH (to take the PHY out of reset, only output LOW
to reset the PHY is supported). The datasheet states it's an "3.3V input
tolerant open drain (OD) output pin". Instead there's a pull-up resistor
on the board to take the PHY out of reset. The GPIO itself will be set
to INPUT mode to take the PHY out of reset and LOW to reset the PHY,
which is achieved with the flags (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN).

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
index 4146cd84989c..f911bbdc4e70 100644
--- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
@@ -186,6 +186,10 @@
 		/* Realtek RTL8211F (0x001cc916) */	
 		reg = <0>;
 		max-speed = <1000>;
+
+		reset-assert-us = <10000>;
+		reset-deassert-us = <30000>;
+		reset-gpios = <&gpio GPIOZ_15 (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN)>;
 	};
 };
 
-- 
2.22.0


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Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-12 20:55 [PATCH v2 0/4] Ethernet PHY reset GPIO updates for Amlogic SoCs Martin Blumenstingl
2019-06-12 20:55 ` [PATCH v2 1/4] arm64: dts: meson: g12a: x96-max: fix the Ethernet PHY reset line Martin Blumenstingl
2019-06-14  9:02   ` Neil Armstrong
2019-06-12 20:55 ` [PATCH v2 2/4] ARM: dts: meson: switch to the generic Ethernet PHY reset bindings Martin Blumenstingl
2019-06-14  9:02   ` Neil Armstrong
2019-06-12 20:55 ` [PATCH v2 3/4] arm64: dts: meson: use the generic Ethernet PHY reset GPIO bindings Martin Blumenstingl
2019-06-14  9:03   ` Neil Armstrong
2019-06-12 20:55 ` Martin Blumenstingl [this message]
2019-06-14  9:08   ` [PATCH v2 4/4] arm64: dts: meson: g12b: odroid-n2: add the Ethernet PHY reset line Neil Armstrong

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