ARM: imx: add enet init for i.MX7D platform

Add enet phy fixup, clock source init for i.MX7D platform.
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/mach-imx/mach-imx7d.c

@@ -6,12 +6,85 @@
  * published by the Free Software Foundation.
  */
 #include <linux/irqchip.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/imx7-iomuxc-gpr.h>
 #include <linux/of_platform.h>
+#include <linux/phy.h>
+#include <linux/regmap.h>
+
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 
 #include "common.h"
 
+static int ar8031_phy_fixup(struct phy_device *dev)
+{
+	u16 val;
+
+	/* Set RGMII IO voltage to 1.8V */
+	phy_write(dev, 0x1d, 0x1f);
+	phy_write(dev, 0x1e, 0x8);
+
+	/* disable phy AR8031 SmartEEE function. */
+	phy_write(dev, 0xd, 0x3);
+	phy_write(dev, 0xe, 0x805d);
+	phy_write(dev, 0xd, 0x4003);
+	val = phy_read(dev, 0xe);
+	val &= ~(0x1 << 8);
+	phy_write(dev, 0xe, val);
+
+	/* introduce tx clock delay */
+	phy_write(dev, 0x1d, 0x5);
+	val = phy_read(dev, 0x1e);
+	val |= 0x0100;
+	phy_write(dev, 0x1e, val);
+
+	return 0;
+}
+
+static int bcm54220_phy_fixup(struct phy_device *dev)
+{
+	/* enable RXC skew select RGMII copper mode */
+	phy_write(dev, 0x1e, 0x21);
+	phy_write(dev, 0x1f, 0x7ea8);
+	phy_write(dev, 0x1e, 0x2f);
+	phy_write(dev, 0x1f, 0x71b7);
+
+	return 0;
+}
+
+#define PHY_ID_AR8031	0x004dd074
+#define PHY_ID_BCM54220	0x600d8589
+
+static void __init imx7d_enet_phy_init(void)
+{
+	if (IS_BUILTIN(CONFIG_PHYLIB)) {
+		phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
+					   ar8031_phy_fixup);
+		phy_register_fixup_for_uid(PHY_ID_BCM54220, 0xffffffff,
+					   bcm54220_phy_fixup);
+	}
+}
+
+static void __init imx7d_enet_clk_sel(void)
+{
+	struct regmap *gpr;
+
+	gpr = syscon_regmap_lookup_by_compatible("fsl,imx7d-iomuxc-gpr");
+	if (!IS_ERR(gpr)) {
+		regmap_update_bits(gpr, IOMUXC_GPR1, IMX7D_GPR1_ENET_TX_CLK_SEL_MASK, 0);
+		regmap_update_bits(gpr, IOMUXC_GPR1, IMX7D_GPR1_ENET_CLK_DIR_MASK, 0);
+	} else {
+		pr_err("failed to find fsl,imx7d-iomux-gpr regmap\n");
+	}
+}
+
+static inline void imx7d_enet_init(void)
+{
+	imx7d_enet_phy_init();
+	imx7d_enet_clk_sel();
+}
+
 static void __init imx7d_init_machine(void)
 {
 	struct device *parent;
@@ -22,6 +95,7 @@ static void __init imx7d_init_machine(void)
 
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 	imx_anatop_init();
+	imx7d_enet_init();
 }
 
 static void __init imx7d_init_irq(void)