From efd0b791069af93e9d439a70d1fe2ae8994dbbfa Mon Sep 17 00:00:00 2001
From: Michael Trimarchi <michael@amarulasolutions.com>
Date: Sun, 17 Jun 2018 15:22:39 +0200
Subject: [PATCH] eth: dm: fec: Add gpio phy reset binding

Add the missing gpio phy reset binding to the gpio and
reset time configuration

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
---
 drivers/net/fec_mxc.c | 43 +++++++++++++++++++++++++++++++++++++------
 drivers/net/fec_mxc.h |  5 ++++-
 2 files changed, 41 insertions(+), 7 deletions(-)

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index 694a0b2..dac07b6 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -15,7 +15,6 @@
 #include <miiphy.h>
 #include <net.h>
 #include <netdev.h>
-#include "fec_mxc.h"
 
 #include <asm/io.h>
 #include <linux/errno.h>
@@ -24,6 +23,9 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/mach-imx/sys_proto.h>
+#include <asm-generic/gpio.h>
+
+#include "fec_mxc.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -1245,6 +1247,19 @@ static int fec_phy_init(struct fec_priv *priv, struct udevice *dev)
 	return 0;
 }
 
+#ifdef CONFIG_DM_GPIO
+/* FEC GPIO reset */
+static void fec_gpio_reset(struct fec_priv *priv)
+{
+	debug("fec_gpio_reset: fec_gpio_reset(dev)\n");
+	if (dm_gpio_is_valid(&priv->phy_reset_gpio)) {
+		dm_gpio_set_value(&priv->phy_reset_gpio, 1);
+		udelay(priv->reset_delay);
+		dm_gpio_set_value(&priv->phy_reset_gpio, 0);
+	}
+}
+#endif
+
 static int fecmxc_probe(struct udevice *dev)
 {
 	struct eth_pdata *pdata = dev_get_platdata(dev);
@@ -1257,6 +1272,9 @@ static int fecmxc_probe(struct udevice *dev)
 	if (ret)
 		return ret;
 
+#ifdef CONFIG_DM_GPIO
+	fec_gpio_reset(priv);
+#endif
 	/* Reset chip. */
 	writel(readl(&priv->eth->ecntrl) | FEC_ECNTRL_RESET,
 	       &priv->eth->ecntrl);
@@ -1314,6 +1332,7 @@ static int fecmxc_remove(struct udevice *dev)
 
 static int fecmxc_ofdata_to_platdata(struct udevice *dev)
 {
+	int ret = 0;
 	struct eth_pdata *pdata = dev_get_platdata(dev);
 	struct fec_priv *priv = dev_get_priv(dev);
 	const char *phy_mode;
@@ -1331,12 +1350,24 @@ static int fecmxc_ofdata_to_platdata(struct udevice *dev)
 		return -EINVAL;
 	}
 
-	/* TODO
-	 * Need to get the reset-gpio and related properties from DT
-	 * and implemet the enet reset code on .probe call
-	 */
+#ifdef CONFIG_DM_GPIO
+	ret = gpio_request_by_name(dev, "phy-reset-gpios", 0,
+			     &priv->phy_reset_gpio, GPIOD_IS_OUT);
+	if (ret == 0) {
+		ret = dev_read_u32_array(dev, "phy-reset-duration",
+					 &priv->reset_delay, 1);
+	} else if (ret == -ENOENT) {
+		priv->reset_delay = 1000;
+		ret = 0;
+	}
 
-	return 0;
+	if (priv->reset_delay > 1000) {
+		printf("FEX MXC: gpio reset timeout should be less the 1000\n");
+		priv->reset_delay = 1000;
+	}
+#endif
+
+	return ret;
 }
 
 static const struct udevice_id fecmxc_ids[] = {
diff --git a/drivers/net/fec_mxc.h b/drivers/net/fec_mxc.h
index 3b935af..fd89443 100644
--- a/drivers/net/fec_mxc.h
+++ b/drivers/net/fec_mxc.h
@@ -250,7 +250,10 @@ struct fec_priv {
 	int phy_id;
 	int (*mii_postcall)(int);
 #endif
-
+#ifdef CONFIG_DM_GPIO
+	struct gpio_desc phy_reset_gpio;
+	uint32_t reset_delay;
+#endif
 #ifdef CONFIG_DM_ETH
 	u32 interface;
 #endif