kernel: allow device-tree configuration of at803x

This commit adds the ability to configure specific functions of the
at803x series ethernet-PHYs, which were previously configured
exclusively with the help of platform-data, via device-tree.

This is needed to fully support existing boards of the ar71xx platform.

Signed-off-by: David Bauer <mail@david-bauer.net>
(backported from fbe17867daddf76ec26be7dbf6b9af3cfad4a54f)
(rebased patches)
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

diff --git a/target/linux/generic/pending-4.14/736-net-phy-at803x-allow-to-configure-via-dt.patch b/target/linux/generic/pending-4.14/736-net-phy-at803x-allow-to-configure-via-dt.patch
new file mode 100644 (file)
index 0000000..c2e7775
--- /dev/null
+++ b/target/linux/generic/pending-4.14/736-net-phy-at803x-allow-to-configure-via-dt.patch
@@ -0,0 +1,47 @@
+--- a/drivers/net/phy/at803x.c
++++ b/drivers/net/phy/at803x.c
+@@ -353,6 +353,14 @@ static int at803x_config_init(struct phy
+                               AT803X_DEBUG_TX_CLK_DLY_EN, 0);
+       }
+ 
++#ifdef CONFIG_OF_MDIO
++      if (phydev->mdio.dev.of_node &&
++              of_property_read_bool(phydev->mdio.dev.of_node,
++                                    "at803x-disable-smarteee")) {
++              at803x_disable_smarteee(phydev);
++      }
++#endif
++
+       return 0;
+ }
+ 
+@@ -391,6 +399,7 @@ static void at803x_link_change_notify(st
+ {
+       struct at803x_priv *priv = phydev->priv;
+       struct at803x_platform_data *pdata;
++      u8 fixup_rgmii_tx_delay = 0;
+       pdata = dev_get_platdata(&phydev->mdio.dev);
+ 
+       /*
+@@ -420,8 +429,19 @@ static void at803x_link_change_notify(st
+       } else {
+               priv->phy_reset = false;
+       }
+-      if (pdata && pdata->fixup_rgmii_tx_delay &&
+-          phydev->speed != priv->prev_speed) {
++
++      if (pdata && pdata->fixup_rgmii_tx_delay)
++              fixup_rgmii_tx_delay = 1;
++
++#ifdef CONFIG_OF_MDIO
++      if (phydev->mdio.dev.of_node &&
++              of_property_read_bool(phydev->mdio.dev.of_node,
++                                    "at803x-fixup-rgmii-tx-delay")) {
++                      fixup_rgmii_tx_delay = 1;
++      }
++#endif
++
++      if (fixup_rgmii_tx_delay && phydev->speed != priv->prev_speed) {
+               switch (phydev->speed) {
+               case SPEED_10:
+               case SPEED_100: