[U-Boot] [PATCH 6/8] net: pch_gbe: Support PHY reset GPIOs

[Paul Burton]

Add support to the pch_gbe driver for resetting the PHY using a GPIO
specified in the device tree. This matches the support already in Linux.

Signed-off-by: Paul Burton <paul.burton at imgtec.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
Cc: Joe Hershberger <joe.hershberger at ni.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: u-boot at lists.denx.de
Signed-off-by: Paul Burton <paul.burton at mips.com>
---

 drivers/net/pch_gbe.c | 29 +++++++++++++++++++++++++++--
 drivers/net/pch_gbe.h |  1 +
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/net/pch_gbe.c b/drivers/net/pch_gbe.c
index 8866f6632f..351debbd9b 100644
--- a/drivers/net/pch_gbe.c
+++ b/drivers/net/pch_gbe.c
@@ -12,6 +12,7 @@
 #include <asm/io.h>
 #include <pci.h>
 #include <miiphy.h>
+#include <asm/gpio.h>
 #include "pch_gbe.h"
 
 #if !defined(CONFIG_PHYLIB)
@@ -72,6 +73,14 @@ static int pch_gbe_reset(struct udevice *dev)
 	priv->rx_idx = 0;
 	priv->tx_idx = 0;
 
+	if (dm_gpio_is_valid(&priv->gpio_phy_reset)) {
+		/* Reset the PHY */
+		dm_gpio_set_value(&priv->gpio_phy_reset, 1);
+		mdelay(15);
+		dm_gpio_set_value(&priv->gpio_phy_reset, 0);
+		mdelay(5);
+	}
+
 	writel(PCH_GBE_ALL_RST, &mac_regs->reset);
 
 	/*
@@ -451,6 +460,11 @@ int pch_gbe_probe(struct udevice *dev)
 	plat->iobase = (ulong)iobase;
 	priv->mac_regs = (struct pch_gbe_regs *)iobase;
 
+	err = gpio_request_by_name(dev, "phy-reset-gpios", 0,
+				   &priv->gpio_phy_reset, GPIOD_IS_OUT);
+	if (err && (err != -ENOENT))
+		return err;
+
 	/* Read MAC address from SROM and initialize dev->enetaddr with it */
 	pch_gbe_mac_read(priv->mac_regs, plat->enetaddr);
 
@@ -460,9 +474,17 @@ int pch_gbe_probe(struct udevice *dev)
 
 	err = pch_gbe_reset(dev);
 	if (err)
-		return err;
+		goto out_err;
 
-	return pch_gbe_phy_init(dev);
+	err = pch_gbe_phy_init(dev);
+	if (err)
+		goto out_err;
+
+	return 0;
+out_err:
+	if (dm_gpio_is_valid(&priv->gpio_phy_reset))
+		dm_gpio_free(dev, &priv->gpio_phy_reset);
+	return err;
 }
 
 int pch_gbe_remove(struct udevice *dev)
@@ -473,6 +495,9 @@ int pch_gbe_remove(struct udevice *dev)
 	mdio_unregister(priv->bus);
 	mdio_free(priv->bus);
 
+	if (dm_gpio_is_valid(&priv->gpio_phy_reset))
+		dm_gpio_free(dev, &priv->gpio_phy_reset);
+
 	return 0;
 }
 
diff --git a/drivers/net/pch_gbe.h b/drivers/net/pch_gbe.h
index 0ea0c73a4f..1d13380837 100644
--- a/drivers/net/pch_gbe.h
+++ b/drivers/net/pch_gbe.h
@@ -293,6 +293,7 @@ struct pch_gbe_priv {
 	struct udevice *dev;
 	int rx_idx;
 	int tx_idx;
+	struct gpio_desc gpio_phy_reset;
 };
 
 #endif /* _PCH_GBE_H_ */
-- 
2.15.0