[U-Boot] [PATCH v3] net: phy: marvell: Add functions to read PHY's extended registers

[Lukasz Majewski]

This commit allows extended Marvell registers to be read with:

foo > mdio rx FEC 3.10
Reading from bus FEC
PHY at address 0:
3.16 - 0x1063
foo > mdio wx FEC 3.10 0x1011

The above code changes the way ETH connector LEDs blink.

Signed-off-by: Lukasz Majewski <lukma at denx.de>

---

Changes in v3:
    - Enable extended registers access only for 88E151x family of PHYs

Changes in v2:
    - Provide the readext and writeext callbacks to other marvell ETH PHY
    devices

 drivers/net/phy/marvell.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index b7f300e40f..0b9a9fce8a 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -104,6 +104,31 @@
 #define MIIM_88E151x_MODE_SGMII		1
 #define MIIM_88E151x_RESET_OFFS		15
 
+static int m88e1xxx_phy_extread(struct phy_device *phydev, int addr,
+				int devaddr, int regnum)
+{
+	int oldpage = phy_read(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE);
+	int val;
+
+	phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE, devaddr);
+	val = phy_read(phydev, MDIO_DEVAD_NONE, regnum);
+	phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE, oldpage);
+
+	return val;
+}
+
+static int m88e1xxx_phy_extwrite(struct phy_device *phydev, int addr,
+				 int devaddr, int regnum, u16 val)
+{
+	int oldpage = phy_read(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE);
+
+	phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE, devaddr);
+	phy_write(phydev, MDIO_DEVAD_NONE, regnum, val);
+	phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE, oldpage);
+
+	return 0;
+}
+
 /* Marvell 88E1011S */
 static int m88e1011s_config(struct phy_device *phydev)
 {
@@ -669,6 +694,8 @@ static struct phy_driver M88E1510_driver = {
 	.config = &m88e1510_config,
 	.startup = &m88e1011s_startup,
 	.shutdown = &genphy_shutdown,
+	.readext = &m88e1xxx_phy_extread,
+	.writeext = &m88e1xxx_phy_extwrite,
 };
 
 /*
@@ -684,6 +711,8 @@ static struct phy_driver M88E1518_driver = {
 	.config = &m88e1518_config,
 	.startup = &m88e1011s_startup,
 	.shutdown = &genphy_shutdown,
+	.readext = &m88e1xxx_phy_extread,
+	.writeext = &m88e1xxx_phy_extwrite,
 };
 
 static struct phy_driver M88E1310_driver = {
-- 
2.11.0