boundary: common: eth: add CONFIG_FEC_RESET_PULLUP support

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>

board/boundary/common/Kconfig

@@ -11,6 +11,10 @@ config MAX77823
 	default y if TARGET_NITROGEN6_SCM
 	default y if TARGET_VP
 
+config FEC_RESET_PULLUP
+	bool
+	default y if TARGET_NITROGEN8MM
+
 config OTG_CHARGER
 	bool "otg_charger"
 	depends on MAX77823

board/boundary/common/eth-imx8mm.c

@@ -19,7 +19,11 @@
 #ifdef CONFIG_PHY_ATHEROS
 static const iomux_v3_cfg_t enet_ar8035_gpio_pads[] = {
 #define GP_RGMII_PHY_RESET	IMX_GPIO_NR(3, 15)
+#ifdef CONFIG_FEC_RESET_PULLUP
+	IMX8MM_PAD_NAND_RE_B_GPIO3_IO15 | MUX_PAD_CTRL(WEAK_PULLUP_OUTPUT),
+#else
 	IMX8MM_PAD_NAND_RE_B_GPIO3_IO15 | MUX_PAD_CTRL(WEAK_PULLDN_OUTPUT),
+#endif
 	IMX8MM_PAD_ENET_RD0_GPIO1_IO26 | MUX_PAD_CTRL(PULL_GP(STRAP_AR8035, 0)),
 	IMX8MM_PAD_ENET_RD1_GPIO1_IO27 | MUX_PAD_CTRL(PULL_GP(STRAP_AR8035, 1)),
 	IMX8MM_PAD_ENET_RD2_GPIO1_IO28 | MUX_PAD_CTRL(PULL_GP(STRAP_AR8035, 2)),

board/boundary/common/eth.c

@@ -376,6 +376,15 @@ static void setup_enet_ksz9021(void)
 #endif
 
 #if defined(CONFIG_PHY_ATHEROS) || defined(CONFIG_PHY_MICREL)
+static void release_phy_reset(int gp)
+{
+#ifdef CONFIG_FEC_RESET_PULLUP
+	gpio_direction_input(gp);
+#else
+	gpio_set_value(gp, 1);
+#endif
+}
+
 static void setup_iomux_enet(int kz)
 {
 #ifdef GP_KS8995_RESET
@@ -396,11 +405,13 @@ static void setup_iomux_enet(int kz)
 	/* 1 ms minimum reset pulse for ar8035 */
 	udelay(1000 * 10);
 #ifdef GP_RGMII2_PHY_RESET
-	gpio_set_value(GP_RGMII2_PHY_RESET, 1); /* PHY reset */
+	release_phy_reset(GP_RGMII2_PHY_RESET);
 #endif
+
 #ifdef GP_RGMII_PHY_RESET
-	gpio_set_value(GP_RGMII_PHY_RESET, 1); /* PHY reset */
+	release_phy_reset(GP_RGMII_PHY_RESET);
 #endif
+
 #ifdef GP_KS8995_POWER_DOWN
 	gpio_direction_output(GP_KS8995_POWER_DOWN, 1);
 #endif