[PATCH v1 04/15] arm64: dts: freescale: imx8mn-var-som: Update FEC support with MaxLinear PHY

[Stefano Radaelli]

From: Stefano Radaelli <stefano.r at variscite.com>

Update the FEC Ethernet controller on the i.MX8MN VAR-SOM to match the
latest SOM hardware revision using the integrated MaxLinear MXL86110 PHY.

Add the PHY VDDIO supply regulator, adjust reset timings and add a
pinctrl sleep state for low-power operation.

The PHY LED signals originate on the SOM, but the actual LEDs are part
of the carrier implementation (RJ45 connector). Move the LED
configuration to the Symphony carrier device tree, matching the
evaluation board LED wiring.

Wake-on-LAN via magic packet is not supported at the VAR-SOM level and
is therefore not enabled in the SOM device tree nor in the official
evaluation carrier board configuration (symphony).
Designs requiring WoL support may enable it in their own carrier-specific
device trees if properly integrated at the hardware level.

Signed-off-by: Stefano Radaelli <stefano.r at variscite.com>
---
 .../dts/freescale/imx8mn-var-som-symphony.dts | 20 ++++++++++++++++++-
 .../boot/dts/freescale/imx8mn-var-som.dtsi    | 20 ++++++++++---------
 2 files changed, 30 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
index 7308613a48b2..520aff23e587 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
@@ -8,6 +8,7 @@
 
 /dts-v1/;
 
+#include <dt-bindings/leds/common.h>
 #include <dt-bindings/usb/pd.h>
 #include "imx8mn-var-som.dtsi"
 
@@ -74,7 +75,24 @@ reg_per_3v3: regulator-peripheral-3v3 {
 };
 
 &ethphy {
-	reset-gpios = <&pca9534 5 GPIO_ACTIVE_HIGH>;
+	leds {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		led at 0 {
+			reg = <0>;
+			color = <LED_COLOR_ID_YELLOW>;
+			function = LED_FUNCTION_LAN;
+			linux,default-trigger = "netdev";
+		};
+
+		led at 1 {
+			reg = <1>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_LAN;
+			linux,default-trigger = "netdev";
+		};
+	};
 };
 
 &i2c2 {
diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
index 71a2f0866822..09146ab76385 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
@@ -35,6 +35,13 @@ reg_3v3_fixed: regulator-3v3-fixed {
 		regulator-max-microvolt = <3300000>;
 		regulator-always-on;
 	};
+
+	reg_phy_vddio: regulator-phy-vddio {
+		compatible = "regulator-fixed";
+		regulator-name = "vddio-1v8";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+	};
 };
 
 &A53_0 {
@@ -96,24 +103,19 @@ &fec1 {
 	phy-mode = "rgmii";
 	phy-handle = <&ethphy>;
 	phy-supply = <&reg_eth_phy>;
-	fsl,magic-packet;
 	status = "okay";
 
 	mdio {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		ethphy: ethernet-phy at 4 { /* AR8033 or ADIN1300 */
+		ethphy: ethernet-phy at 4 {
 			compatible = "ethernet-phy-ieee802.3-c22";
 			reg = <4>;
 			reset-gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
 			reset-assert-us = <10000>;
-			/*
-			 * Deassert delay:
-			 * ADIN1300 requires 5ms.
-			 * AR8033   requires 1ms.
-			 */
-			reset-deassert-us = <20000>;
+			reset-deassert-us = <100000>;
+			vddio-supply = <&reg_phy_vddio>;
 		};
 	};
 };
@@ -342,7 +344,7 @@ MX8MN_IOMUXC_ENET_TXC_ENET1_RGMII_TXC		0x1f
 			MX8MN_IOMUXC_ENET_RXC_ENET1_RGMII_RXC		0x91
 			MX8MN_IOMUXC_ENET_RX_CTL_ENET1_RGMII_RX_CTL	0x91
 			MX8MN_IOMUXC_ENET_TX_CTL_ENET1_RGMII_TX_CTL	0x1f
-			MX8MN_IOMUXC_GPIO1_IO09_GPIO1_IO9		0x159
+			MX8MN_IOMUXC_GPIO1_IO09_GPIO1_IO9		0x19
 		>;
 	};
 
-- 
2.47.3