[PATCH net-next v2 04/10] net: dsa: lan9303: Added adjust_link() method

[Egil Hjelmeland]

This makes the driver react to device tree "fixed-link" declaration
on CPU port.

- turn off autonegotiation
- force speed 10 or 100 mb/s
- force duplex mode

Signed-off-by: Egil Hjelmeland <pri...@egil-hjelmeland.no>
---
 drivers/net/dsa/lan9303-core.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index 0806a0684d55..be6d78f45a5f 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -17,6 +17,7 @@
 #include <linux/regmap.h>
 #include <linux/mutex.h>
 #include <linux/mii.h>
+#include <linux/phy.h>
 
 #include "lan9303.h"
 
@@ -746,6 +747,37 @@ static int lan9303_phy_write(struct dsa_switch *ds, int 
phy, int regnum,
        return chip->ops->phy_write(chip, phy, regnum, val);
 }
 
+static void lan9303_adjust_link(struct dsa_switch *ds, int port,
+                               struct phy_device *phydev)
+{
+       struct lan9303 *chip = ds->priv;
+
+       int ctl, res;
+
+       ctl = lan9303_phy_read(ds, port, MII_BMCR);
+
+       if (!phy_is_pseudo_fixed_link(phydev))
+               return;
+
+       ctl &= ~BMCR_ANENABLE;
+       if (phydev->speed == SPEED_100)
+               ctl |= BMCR_SPEED100;
+
+       if (phydev->duplex == DUPLEX_FULL)
+               ctl |= BMCR_FULLDPLX;
+
+       res =  lan9303_phy_write(ds, port, MII_BMCR, ctl);
+
+       if (port == chip->phy_addr_sel_strap) {
+               /* Virtual Phy: Remove Turbo 200Mbit mode */
+               lan9303_read(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, &ctl);
+
+               ctl &= ~(1 << 10); // TURBO BIT
+               res =  regmap_write(chip->regmap,
+                                   LAN9303_VIRT_SPECIAL_CTRL, ctl);
+       }
+}
+
 static int lan9303_port_enable(struct dsa_switch *ds, int port,
                               struct phy_device *phy)
 {
@@ -789,6 +821,7 @@ static struct dsa_switch_ops lan9303_switch_ops = {
        .get_strings = lan9303_get_strings,
        .phy_read = lan9303_phy_read,
        .phy_write = lan9303_phy_write,
+       .adjust_link = lan9303_adjust_link,
        .get_ethtool_stats = lan9303_get_ethtool_stats,
        .get_sset_count = lan9303_get_sset_count,
        .port_enable = lan9303_port_enable,
-- 
2.11.0