linux-kernel - [PATCH v2] ARM: dts: zynq: Fix ethernet PHY for v5 schematics

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Date:   Tue, 28 Apr 2020 13:03:49 +0300
From:   "Matwey V. Kornilov" <matwey@....msu.ru>
To:     Rob Herring <robh+dt@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/ZYNQ
        ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Cc:     matwey.kornilov@...il.com,
        "Matwey V. Kornilov" <matwey@....msu.ru>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/ZYNQ
        ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] ARM: dts: zynq: Fix ethernet PHY for v5 schematics

There are at least two different versions existing for MYIR Zturn:

 * v4 schematics has Atheros AR8035 PHY at 0b000
     http://www.myirtech.com/download/Zynq7000/Z-TURNBOARD_schematic.pdf
 * v5 schematics has Micrel KSZ9031 PHY at 0b011
     v5 schematics available at DVD disk supplied with the board

Specify both PHYs to make ethernet interface working for any board
revision. This commit relies on of_mdiobus_register() behavior.
When phy-handle is missed, every nested PHY node is considered,
while ENODEVs are ignored.

Before the patch:

[   28.295002] macb e000b000.ethernet eth0: Could not attach PHY (-19)

After the patch:

[   28.257365] macb e000b000.ethernet eth0: PHY [e000b000.ethernet-ffffffff:00] driver [Micrel KSZ9031 Gigabit PHY] (irq=POLL)
[   28.257384] macb e000b000.ethernet eth0: configuring for phy/rgmii-id link mode

Signed-off-by: Matwey V. Kornilov <matwey@....msu.ru>
---
Changes since v1:
 - reworded commit message

 arch/arm/boot/dts/zynq-zturn.dts | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/zynq-zturn.dts b/arch/arm/boot/dts/zynq-zturn.dts
index 5ec616ebca08..07da9cf60d02 100644
--- a/arch/arm/boot/dts/zynq-zturn.dts
+++ b/arch/arm/boot/dts/zynq-zturn.dts
@@ -67,10 +67,17 @@
 &gem0 {
 	status = "okay";
 	phy-mode = "rgmii-id";
-	phy-handle = <&ethernet_phy>;
 
-	ethernet_phy: ethernet-phy@0 {
-		reg = <0x0>;
+	ethernet-phy@0 {
+		compatible = "ethernet-phy-ieee802.3-c22";
+		reg = <0>;
+		max-speed = <1000>;
+	};
+
+	ethernet-phy@3 {
+		compatible = "ethernet-phy-ieee802.3-c22";
+		reg = <3>;
+		max-speed = <1000>;
 	};
 };
 
-- 
2.16.4