ARM: dts: imx6qdl-icore: Add FEC support

Add FEC support for Engicam i.CoreM6 dql modules.

Observed similar 'eth0: link is not ready' issue which was
discussed in [1] due rmii mode with external ref_clk, so added
clock node along with the properties mentioned by Shawn in [2]

FEC link log:
------------
$ ifconfig eth0 up
[   27.905187] SMSC LAN8710/LAN8720 2188000.ethernet:00: attached PHY driver
               [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=2188000.ethernet:00, irq=-1)
[   27.918982] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready

[1] https://patchwork.kernel.org/patch/3491061/
[2] https://patchwork.kernel.org/patch/3490511/

Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Matteo Lisi <matteo.lisi@engicam.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/imx6qdl-icore.dtsi b/arch/arm/boot/dts/imx6qdl-icore.dtsi
index 0a1b60a..023839a 100644 (file)
--- a/arch/arm/boot/dts/imx6qdl-icore.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-icore.dtsi
@@ -74,6 +74,12 @@
                regulator-boot-on;
                regulator-always-on;
        };
+
+       rmii_clk: clock-rmii-clk {
+               compatible = "fixed-clock";
+               #clock-cells = <0>;
+               clock-frequency = <25000000>;  /* 25MHz for example */
+       };
 };
 
 &can1 {
@@ -93,6 +99,15 @@
        assigned-clock-parents = <&clks IMX6QDL_CLK_OSC>;
 };
 
+&fec {
+       pinctrl-names = "default";
+       pinctrl-0 = <&pinctrl_enet>;
+       phy-reset-gpios = <&gpio7 12 GPIO_ACTIVE_LOW>;
+       clocks = <&clks IMX6QDL_CLK_ENET>, <&clks IMX6QDL_CLK_ENET>, <&rmii_clk>;
+       phy-mode = "rmii";
+       status = "okay";
+};
+
 &gpmi {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_gpmi_nand>;
@@ -150,6 +165,22 @@
 };
 
 &iomuxc {
+       pinctrl_enet: enetgrp {
+               fsl,pins = <
+                       MX6QDL_PAD_ENET_CRS_DV__ENET_RX_EN      0x1b0b0
+                       MX6QDL_PAD_GPIO_16__ENET_REF_CLK        0x1b0b1
+                       MX6QDL_PAD_ENET_TX_EN__ENET_TX_EN       0x1b0b0
+                       MX6QDL_PAD_ENET_RXD1__ENET_RX_DATA1     0x1b0b0
+                       MX6QDL_PAD_ENET_RXD0__ENET_RX_DATA0     0x1b0b0
+                       MX6QDL_PAD_ENET_TXD1__ENET_TX_DATA1     0x1b0b0
+                       MX6QDL_PAD_ENET_TXD0__ENET_TX_DATA0     0x1b0b0
+                       MX6QDL_PAD_ENET_MDC__ENET_MDC           0x1b0b0
+                       MX6QDL_PAD_ENET_MDIO__ENET_MDIO         0x1b0b0
+                       MX6QDL_PAD_ENET_REF_CLK__GPIO1_IO23     0x1b0b0
+                       MX6QDL_PAD_GPIO_17__GPIO7_IO12          0x1b0b0
+               >;
+       };
+
        pinctrl_flexcan1: flexcan1grp {
                fsl,pins = <
                        MX6QDL_PAD_KEY_ROW2__FLEXCAN1_RX 0x1b020