phy: add support for a reset-gpio specification

The framework only asserts (for now) that the reset gpio is not active.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt
index bc1c3c8..c00a9a8 100644 (file)
--- a/Documentation/devicetree/bindings/net/phy.txt
+++ b/Documentation/devicetree/bindings/net/phy.txt
@@ -35,6 +35,8 @@ Optional Properties:
 - broken-turn-around: If set, indicates the PHY device does not correctly
   release the turn around line low at the end of a MDIO transaction.
 
+- reset-gpios: Reference to a GPIO used to reset the phy.
+
 Example:
 
 ethernet-phy@0 {
@@ -42,4 +44,5 @@ ethernet-phy@0 {
        interrupt-parent = <40000>;
        interrupts = <35 1>;
        reg = <0>;
+       reset-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>;
 };

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index e977ba9..307f72a 100644 (file)
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -34,6 +34,7 @@
 #include <linux/io.h>
 #include <linux/uaccess.h>
 #include <linux/of.h>
+#include <linux/gpio/consumer.h>
 
 #include <asm/irq.h>
 
@@ -1570,9 +1571,16 @@ static int phy_probe(struct device *dev)
        struct device_driver *drv = phydev->mdio.dev.driver;
        struct phy_driver *phydrv = to_phy_driver(drv);
        int err = 0;
+       struct gpio_descs *reset_gpios;
 
        phydev->drv = phydrv;
 
+       /* take phy out of reset */
+       reset_gpios = devm_gpiod_get_array_optional(dev, "reset",
+                                                   GPIOD_OUT_LOW);
+       if (IS_ERR(reset_gpios))
+               return PTR_ERR(reset_gpios);
+
        /* Disable the interrupt if the PHY doesn't support it
         * but the interrupt is still a valid one
         */