[PATCH net-next 1/2] net: phy: realtek: add support for EEE registers on integrated PHY's

[Heiner Kallweit]

EEE-related registers on newer integrated PHY's have the standard
layout, but are accessible not via MMD but via vendor-specific
registers. Emulating the standard MMD registers allows to use the
generic functions for EEE control.

Signed-off-by: Heiner Kallweit <hkallwe...@gmail.com>
---
 drivers/net/phy/realtek.c | 43 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index c49a1fb13..2635ad1ff 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -266,6 +266,45 @@ static int rtl8366rb_config_init(struct phy_device *phydev)
        return ret;
 }
 
+static int rtlgen_read_mmd(struct phy_device *phydev, int devnum, u16 regnum)
+{
+       int ret;
+
+       if (devnum == MDIO_MMD_PCS && regnum == MDIO_PCS_EEE_ABLE) {
+               rtl821x_write_page(phydev, 0xa5c);
+               ret = __phy_read(phydev, 0x12);
+               rtl821x_write_page(phydev, 0);
+       } else if (devnum == MDIO_MMD_AN && regnum == MDIO_AN_EEE_ADV) {
+               rtl821x_write_page(phydev, 0xa5d);
+               ret = __phy_read(phydev, 0x10);
+               rtl821x_write_page(phydev, 0);
+       } else if (devnum == MDIO_MMD_AN && regnum == MDIO_AN_EEE_LPABLE) {
+               rtl821x_write_page(phydev, 0xa5d);
+               ret = __phy_read(phydev, 0x11);
+               rtl821x_write_page(phydev, 0);
+       } else {
+               ret = -EOPNOTSUPP;
+       }
+
+       return ret;
+}
+
+static int rtlgen_write_mmd(struct phy_device *phydev, int devnum, u16 regnum,
+                           u16 val)
+{
+       int ret;
+
+       if (devnum == MDIO_MMD_AN && regnum == MDIO_AN_EEE_ADV) {
+               rtl821x_write_page(phydev, 0xa5d);
+               ret = __phy_write(phydev, 0x10, val);
+               rtl821x_write_page(phydev, 0);
+       } else {
+               ret = -EOPNOTSUPP;
+       }
+
+       return ret;
+}
+
 static int rtl8125_get_features(struct phy_device *phydev)
 {
        int val;
@@ -422,6 +461,8 @@ static struct phy_driver realtek_drvs[] = {
                .resume         = genphy_resume,
                .read_page      = rtl821x_read_page,
                .write_page     = rtl821x_write_page,
+               .read_mmd       = rtlgen_read_mmd,
+               .write_mmd      = rtlgen_write_mmd,
        }, {
                .name           = "RTL8125 2.5Gbps internal",
                .match_phy_device = rtl8125_match_phy_device,
@@ -432,6 +473,8 @@ static struct phy_driver realtek_drvs[] = {
                .resume         = genphy_resume,
                .read_page      = rtl821x_read_page,
                .write_page     = rtl821x_write_page,
+               .read_mmd       = rtlgen_read_mmd,
+               .write_mmd      = rtlgen_write_mmd,
        }, {
                PHY_ID_MATCH_EXACT(0x001cc961),
                .name           = "RTL8366RB Gigabit Ethernet",
-- 
2.22.1