net: arc_emac: support the phy reset for emac driver

This patch adds to support the emac phy reset.

Different boards may require different phy reset duration. Add property
phy-reset-duration for emac driver, so that the boards that need
a longer reset duration can specify it in their device tree.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Cc: Alexander Kochetkov <al.kochet@gmail.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 43 insertions, 0 deletions

diff --git a/drivers/net/ethernet/arc/emac.h b/drivers/net/ethernet/arc/emac.h
index dae1ac300a49..1a4040397a4b 100644
--- a/drivers/net/ethernet/arc/emac.h
+++ b/drivers/net/ethernet/arc/emac.h
@@ -102,6 +102,11 @@ struct buffer_state {
         DEFINE_DMA_UNMAP_LEN(len);
 };
 
+struct arc_emac_mdio_bus_data {
+        struct gpio_desc *reset_gpio;
+        int msec;
+};
+
 /**
  * struct arc_emac_priv - Storage of EMAC's private information.
  * @dev:        Pointer to the current device.
@@ -131,6 +136,7 @@ struct arc_emac_priv {
         struct device *dev;
         struct phy_device *phy_dev;
         struct mii_bus *bus;
+        struct arc_emac_mdio_bus_data bus_data;
 
         void __iomem *regs;
         struct clk *clk;
diff --git a/drivers/net/ethernet/arc/emac_mdio.c b/drivers/net/ethernet/arc/emac_mdio.c
index d5ee986936da..caf704264eba 100644
--- a/drivers/net/ethernet/arc/emac_mdio.c
+++ b/drivers/net/ethernet/arc/emac_mdio.c
@@ -7,6 +7,7 @@
 #include <linux/delay.h>
 #include <linux/of_mdio.h>
 #include <linux/platform_device.h>
+#include <linux/gpio/consumer.h>
 
 #include "emac.h"
 
@@ -99,6 +100,25 @@ static int arc_mdio_write(struct mii_bus *bus, int phy_addr,
 }
 
 /**
+ * arc_mdio_reset
+ * @bus: points to the mii_bus structure
+ * Description: reset the MII bus
+ */
+int arc_mdio_reset(struct mii_bus *bus)
+{
+        struct arc_emac_priv *priv = bus->priv;
+        struct arc_emac_mdio_bus_data *data = &priv->bus_data;
+
+        if (data->reset_gpio) {
+                gpiod_set_value_cansleep(data->reset_gpio, 1);
+                msleep(data->msec);
+                gpiod_set_value_cansleep(data->reset_gpio, 0);
+        }
+
+        return 0;
+}
+
+/**
  * arc_mdio_probe - MDIO probe function.
  * @priv:       Pointer to ARC EMAC private data structure.
  *
@@ -109,6 +129,8 @@ static int arc_mdio_write(struct mii_bus *bus, int phy_addr,
  */
 int arc_mdio_probe(struct arc_emac_priv *priv)
 {
+        struct arc_emac_mdio_bus_data *data = &priv->bus_data;
+        struct device_node *np = priv->dev->of_node;
         struct mii_bus *bus;
         int error;
 
@@ -122,6 +144,21 @@ int arc_mdio_probe(struct arc_emac_priv *priv)
         bus->name = "Synopsys MII Bus",
         bus->read = &arc_mdio_read;
         bus->write = &arc_mdio_write;
+        bus->reset = &arc_mdio_reset;
+
+        /* optional reset-related properties */
+        data->reset_gpio = devm_gpiod_get_optional(priv->dev, "phy-reset",
+                                                   GPIOD_OUT_LOW);
+        if (IS_ERR(data->reset_gpio)) {
+                error = PTR_ERR(data->reset_gpio);
+                dev_err(priv->dev, "Failed to request gpio: %d\n", error);
+                return error;
+        }
+
+        of_property_read_u32(np, "phy-reset-duration", &data->msec);
+        /* A sane reset duration should not be longer than 1s */
+        if (data->msec > 1000)
+                data->msec = 1;
 
         snprintf(bus->id, MII_BUS_ID_SIZE, "%s", bus->name);