[PATCH 5.10 085/142] ARM: dts: imx6qdl-sr-som: fix some cubox-i platforms

Greg Kroah-Hartman
2021-02-02T19:58:13Z

From: Russell King <rmk+kernel@armlinux.org.uk>

[ Upstream commit 2cc0bfc9c12784188482a8f3d751d44af45b0d97 ]

The PHY address bit 2 is configured by the LED pin. Attaching a LED
to this pin is not sufficient to guarantee this configuration pin is
correctly read. This leads to some platforms having their PHY at
address 0 and others at address 4.

If there is no phy-handle specified, the FEC driver will scan the PHY
bus for a PHY and use that. Consequently, adding the DT configuration
of the PHY and the phy properties to the FEC driver broke some boards.

Fix this by removing the phy-handle property, and listing two PHY
entries for both possible PHY addresses, so that the DT configuration
for the PHY can be found by the PHY driver.

Fixes: 86b08bd5b994 ("ARM: dts: imx6-sr-som: add ethernet PHY configuration")
Reported-by: Christoph Mattheis <christoph.mattheis@arcor.de>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm/boot/dts/imx6qdl-sr-som.dtsi | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/imx6qdl-sr-som.dtsi b/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
index b06577808ff4e..7e4e5fd0143a1 100644
--- a/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
@@ -53,7 +53,6 @@
&fec {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_microsom_enet_ar8035>;
- phy-handle = <&phy>;
phy-mode = "rgmii-id";
phy-reset-duration = <2>;
phy-reset-gpios = <&gpio4 15 GPIO_ACTIVE_LOW>;
@@ -63,10 +62,19 @@
#address-cells = <1>;
#size-cells = <0>;

- phy: ethernet-phy@0 {
+ /*
+ * The PHY can appear at either address 0 or 4 due to the
+ * configuration (LED) pin not being pulled sufficiently.
+ */
+ ethernet-phy@0 {
reg = <0>;
qca,clk-out-frequency = <125000000>;
};
+
+ ethernet-phy@4 {
+ reg = <4>;
+ qca,clk-out-frequency = <125000000>;
+ };
};
};

--
2.27.0