1 files changed, 42 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.4/737-net-phy-at803x-Request-reset-GPIO-only-for-AT8030-PH.patch b/target/linux/generic/pending-4.4/737-net-phy-at803x-Request-reset-GPIO-only-for-AT8030-PH.patch
new file mode 100644
index 0000000000..b30ba7aaae
--- /dev/null
+++ b/target/linux/generic/pending-4.4/737-net-phy-at803x-Request-reset-GPIO-only-for-AT8030-PH.patch
@@ -0,0 +1,42 @@
+From: Sebastian Frias <sf84@laposte.net>
+Date: Wed, 23 Mar 2016 11:49:09 +0100
+Subject: [PATCH] net: phy: at803x: Request 'reset' GPIO only for AT8030 PHY
+
+This removes the dependency on GPIOLIB for non faulty PHYs.
+
+Indeed, without this patch, if GPIOLIB is not selected
+devm_gpiod_get_optional() will return -ENOSYS and the driver probe
+call will fail, regardless of the actual PHY hardware.
+
+Out of the 3 PHYs supported by this driver (AT8030, AT8031, AT8035),
+only AT8030 presents the issues that commit 13a56b449325 ("net: phy:
+at803x: Add support for hardware reset") attempts to work-around by
+using a 'reset' GPIO line.
+
+Hence, only AT8030 should depend on GPIOLIB operating properly.
+
+Fixes: 13a56b449325 ("net: phy: at803x: Add support for hardware reset")
+
+Signed-off-by: Sebastian Frias <sf84@laposte.net>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+
+--- a/drivers/net/phy/at803x.c
++++ b/drivers/net/phy/at803x.c
+@@ -250,12 +250,16 @@ static int at803x_probe(struct phy_devic
+ 	if (!priv)
+ 		return -ENOMEM;
+ 
++	if (phydev->drv->phy_id != ATH8030_PHY_ID)
++		goto does_not_require_reset_workaround;
++
+ 	gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+ 	if (IS_ERR(gpiod_reset))
+ 		return PTR_ERR(gpiod_reset);
+ 
+ 	priv->gpiod_reset = gpiod_reset;
+ 
++does_not_require_reset_workaround:
+ 	phydev->priv = priv;
+ 
+ 	return 0;