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net: phy: realtek: Add functions to read PHY's extended registers 

According to the datasheet to access the extended registers we have to:

1. Write Register 31 Data = 0x0XYZ (Page 0xXYZ)
2. Read/Write the target Register Data
3. Write Register 31 Data = 0x0000 or 0xa42 (switch back to IEEE
   Standard Registers)

Hook the missing functions so that we can use the `mdio rx/wx` command to
easily access the extended registers.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Carlo Caione 2019-01-16 11:34:50 +00:00 committed by Joe Hershberger
parent 9043c4e0fc
commit e57c9fdb04
1 changed files with 29 additions and 0 deletions
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29
drivers/net/phy/realtek.c
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@ -57,6 +57,33 @@
#define MIIM_RTL8211F_TX_DELAY 0x100 #define MIIM_RTL8211F_TX_DELAY 0x100
#define MIIM_RTL8211F_LCR 0x10 #define MIIM_RTL8211F_LCR 0x10
static int rtl8211f_phy_extread(struct phy_device *phydev, int addr,
int devaddr, int regnum)
{
int oldpage = phy_read(phydev, MDIO_DEVAD_NONE,
MIIM_RTL8211F_PAGE_SELECT);
int val;
phy_write(phydev, MDIO_DEVAD_NONE, MIIM_RTL8211F_PAGE_SELECT, devaddr);
val = phy_read(phydev, MDIO_DEVAD_NONE, regnum);
phy_write(phydev, MDIO_DEVAD_NONE, MIIM_RTL8211F_PAGE_SELECT, oldpage);
return val;
}
static int rtl8211f_phy_extwrite(struct phy_device *phydev, int addr,
int devaddr, int regnum, u16 val)
{
int oldpage = phy_read(phydev, MDIO_DEVAD_NONE,
MIIM_RTL8211F_PAGE_SELECT);
phy_write(phydev, MDIO_DEVAD_NONE, MIIM_RTL8211F_PAGE_SELECT, devaddr);
phy_write(phydev, MDIO_DEVAD_NONE, regnum, val);
phy_write(phydev, MDIO_DEVAD_NONE, MIIM_RTL8211F_PAGE_SELECT, oldpage);
return 0;
}
static int rtl8211b_probe(struct phy_device *phydev) static int rtl8211b_probe(struct phy_device *phydev)
{ {
#ifdef CONFIG_RTL8211X_PHY_FORCE_MASTER #ifdef CONFIG_RTL8211X_PHY_FORCE_MASTER
@ -336,6 +363,8 @@ static struct phy_driver RTL8211F_driver = {
.config = &rtl8211f_config, .config = &rtl8211f_config,
.startup = &rtl8211f_startup, .startup = &rtl8211f_startup,
.shutdown = &genphy_shutdown, .shutdown = &genphy_shutdown,
.readext = &rtl8211f_phy_extread,
.writeext = &rtl8211f_phy_extwrite,
}; };
int phy_realtek_init(void) int phy_realtek_init(void)