[PATCH] mx6cuboxi: Fix Ethernet after DT sync with Linux

[Fabio Estevam <festevam@gmail.com>]

From: Josua Mayer <josua@solid-run.com>

The i.MX6 Cubox-i and HummingBoards can have different PHYs at varying
addresses. U-Boot needs to auto-detect which phy is actually present,
and at which address it is responding.

Auto-detection from multiple phy nodes specified in device-tree does not
currently work correct. As a work-around merge all three possible phys
into one node with the special address 0xffffffff which indicates to the
generic phy driver to probe all addresses.
Also fixup this fake address before booting Linux, *if* booting with
U-Boot's internal dtb.

Signed-off-by: Josua Mayer <josua@solid-run.com>
[fabio: Added the changes to imx6qdl-sr-som-u-boot.dtsi.]
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Tested-by: Christian Gmeiner <cgmeiner@igalia.com>
---
 ...qdl-hummingboard2-emmc-som-v15-u-boot.dtsi |  1 +
 arch/arm/dts/imx6qdl-sr-som-u-boot.dtsi       | 40 +++++++++++++++++++
 board/solidrun/mx6cuboxi/mx6cuboxi.c          |  8 +++-
 3 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/dts/imx6qdl-sr-som-u-boot.dtsi

diff --git a/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi b/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
index e9b188ed6587..358cf8abc4ff 100644
--- a/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
+++ b/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 
 #include "imx6qdl-u-boot.dtsi"
+#include "imx6qdl-sr-som-u-boot.dtsi"
 
 / {
 	board-detect {
diff --git a/arch/arm/dts/imx6qdl-sr-som-u-boot.dtsi b/arch/arm/dts/imx6qdl-sr-som-u-boot.dtsi
new file mode 100644
index 000000000000..4c5f043ea92a
--- /dev/null
+++ b/arch/arm/dts/imx6qdl-sr-som-u-boot.dtsi
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+
+#include <dt-bindings/gpio/gpio.h>
+
+&fec {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_microsom_enet_ar8035>;
+	phy-handle = <&phy>;
+	phy-mode = "rgmii-id";
+
+	/*
+	 * The PHY seems to require a long-enough reset duration to avoid
+	 * some rare issues where the PHY gets stuck in an inconsistent and
+	 * non-functional state at boot-up. 10ms proved to be fine .
+	 */
+	phy-reset-duration = <10>;
+	phy-reset-gpios = <&gpio4 15 GPIO_ACTIVE_LOW>;
+	status = "okay";
+
+	mdio {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		/delete-node/ ethernet-phy@1;
+		/delete-node/ ethernet-phy@4;
+
+		phy: ethernet-phy@0 {
+			/*
+			 * The PHY can appear either:
+			 * - AR8035: at address 0 or 4
+			 * - ADIN1300: at address 1
+			 * Actual address being detected at runtime.
+			 */
+			reg = <0xffffffff>;
+			qca,clk-out-frequency = <125000000>;
+			qca,smarteee-tw-us-1g = <24>;
+			adi,phy-output-clock = "125mhz-free-running";
+		};
+	};
+};
diff --git a/board/solidrun/mx6cuboxi/mx6cuboxi.c b/board/solidrun/mx6cuboxi/mx6cuboxi.c
index 8edabf4404c2..fbab39e800a6 100644
--- a/board/solidrun/mx6cuboxi/mx6cuboxi.c
+++ b/board/solidrun/mx6cuboxi/mx6cuboxi.c
@@ -447,7 +447,7 @@ static int find_ethernet_phy(void)
  */
 int ft_board_setup(void *fdt, struct bd_info *bd)
 {
-	int node_phy0, node_phy1, node_phy4;
+	int node_phy, node_phy0, node_phy1, node_phy4;
 	int ret, phy;
 	bool enable_phy0 = false, enable_phy1 = false, enable_phy4 = false;
 	enum board_type board;
@@ -479,6 +479,12 @@ int ft_board_setup(void *fdt, struct bd_info *bd)
 		return 0;
 	}
 
+	// update U-Boot's own unified phy node phy address, if present
+	node_phy = fdt_path_offset(fdt, "/soc/bus@2100000/ethernet@2188000/mdio/phy");
+	ret = fdt_setprop_u32(fdt, node_phy, "reg", phy);
+	if (ret < 0)
+		pr_err("%s: failed to update unified PHY node address\n", __func__);
+
 	// update all phy nodes status
 	node_phy0 = fdt_path_offset(fdt, "/soc/bus@2100000/ethernet@2188000/mdio/ethernet-phy@0");
 	ret = fdt_setprop_string(fdt, node_phy0, "status", enable_phy0 ? "okay" : "disabled");
-- 
2.34.1