[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.bur...@imgtec.com>
Cc: Daniel Schwierzeck <daniel.schwierz...@gmail.com>
Cc: Joe Hershberger <joe.hershber...@ni.com>
Cc: Simon Glass <s...@chromium.org>
Cc: u-boot@lists.denx.de
Signed-off-by: Paul Burton <paul.bur...@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

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