net: phy: micrel: add support for DLL setup on ksz9131

Add support for DLL setup on KSZ9131.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

diff --git a/drivers/net/phy/micrel_ksz90x1.c b/drivers/net/phy/micrel_ksz90x1.c
index f0032e8ce166813f9fe58afa380064df3f27537e..d6694c5cd88f57f432081cbc7ca18e9441e6fa34 100644 (file)
--- a/drivers/net/phy/micrel_ksz90x1.c
+++ b/drivers/net/phy/micrel_ksz90x1.c
@@ -396,9 +396,70 @@ static struct phy_driver ksz9031_driver = {
 /*
  * KSZ9131
  */
+
+#define KSZ9131RN_MMD_COMMON_CTRL_REG  2
+#define KSZ9131RN_RXC_DLL_CTRL         76
+#define KSZ9131RN_TXC_DLL_CTRL         77
+#define KSZ9131RN_DLL_CTRL_BYPASS      BIT_MASK(12)
+#define KSZ9131RN_DLL_ENABLE_DELAY     0
+#define KSZ9131RN_DLL_DISABLE_DELAY    BIT(12)
+
+static int ksz9131_config_rgmii_delay(struct phy_device *phydev)
+{
+       struct phy_driver *drv = phydev->drv;
+       u16 rxcdll_val, txcdll_val, val;
+       int ret;
+
+       switch (phydev->interface) {
+       case PHY_INTERFACE_MODE_RGMII:
+               rxcdll_val = KSZ9131RN_DLL_DISABLE_DELAY;
+               txcdll_val = KSZ9131RN_DLL_DISABLE_DELAY;
+               break;
+       case PHY_INTERFACE_MODE_RGMII_ID:
+               rxcdll_val = KSZ9131RN_DLL_ENABLE_DELAY;
+               txcdll_val = KSZ9131RN_DLL_ENABLE_DELAY;
+               break;
+       case PHY_INTERFACE_MODE_RGMII_RXID:
+               rxcdll_val = KSZ9131RN_DLL_ENABLE_DELAY;
+               txcdll_val = KSZ9131RN_DLL_DISABLE_DELAY;
+               break;
+       case PHY_INTERFACE_MODE_RGMII_TXID:
+               rxcdll_val = KSZ9131RN_DLL_DISABLE_DELAY;
+               txcdll_val = KSZ9131RN_DLL_ENABLE_DELAY;
+               break;
+       default:
+               return 0;
+       }
+
+       val = drv->readext(phydev, 0, KSZ9131RN_MMD_COMMON_CTRL_REG,
+                          KSZ9131RN_RXC_DLL_CTRL);
+       val &= ~KSZ9131RN_DLL_CTRL_BYPASS;
+       val |= rxcdll_val;
+       ret = drv->writeext(phydev, 0, KSZ9131RN_MMD_COMMON_CTRL_REG,
+                           KSZ9131RN_RXC_DLL_CTRL, val);
+       if (ret)
+               return ret;
+
+       val = drv->readext(phydev, 0, KSZ9131RN_MMD_COMMON_CTRL_REG,
+                          KSZ9131RN_TXC_DLL_CTRL);
+
+       val &= ~KSZ9131RN_DLL_CTRL_BYPASS;
+       val |= txcdll_val;
+       ret = drv->writeext(phydev, 0, KSZ9131RN_MMD_COMMON_CTRL_REG,
+                           KSZ9131RN_TXC_DLL_CTRL, val);
+
+       return ret;
+}
+
 static int ksz9131_config(struct phy_device *phydev)
 {
-       /* TBD: Implement Skew values for dts */
+       int ret;
+
+       if (phy_interface_is_rgmii(phydev)) {
+               ret = ksz9131_config_rgmii_delay(phydev);
+               if (ret)
+                       return ret;
+       }
 
        /* add an option to disable the gigabit feature of this PHY */
        if (env_get("disable_giga")) {