diff options
| author | Daniel Golle <daniel@makrotopia.org> | 2026-01-13 03:44:17 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-01-17 16:12:16 -0800 |
| commit | 2809a1c4340437f2ff6b73c0094d7ca51b575e1b (patch) | |
| tree | 4e5e32e169981cd09d4fd9dddc62affa340d2759 /drivers/net/phy | |
| parent | 84fb8b93fae2a4c53323b2bf6d81e7ddcc8e7cf4 (diff) | |
net: phy: realtek: simplify C22 reg access via MDIO_MMD_VEND2
RealTek 2.5GE PHYs have all standard Clause-22 registers mapped also
inside MDIO_MMD_VEND2 at offset 0xa400. This is used mainly in case the
PHY is connected to a Clause-45-only bus. The RTL8221B is frequently
used in copper SFP module which uses the RollBall MDIO-over-I2C
method which *only* supports Clause-45, for example.
In order to support using the PHY on Clause-45-only busses, the PHY
driver has previously been split into a C22-only and C45-only instances,
creating quite a bit of redundancy and confusion.
In preparation of reunifying the two driver instances, add support for
translating MDIO_MMD_VEND2 registers 0xa400 to 0xa43c back to Clause-22
registers 0 to 30 in case the PHY is accessed on a Clause-22 bus.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Link: https://patch.msgid.link/fd49d86bd0445b76269fd3ea456c709c2066683f.1768275364.git.daniel@makrotopia.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/phy')
| -rw-r--r-- | drivers/net/phy/realtek/realtek_main.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/net/phy/realtek/realtek_main.c b/drivers/net/phy/realtek/realtek_main.c index 1e78f2b4e6dd..e93780436558 100644 --- a/drivers/net/phy/realtek/realtek_main.c +++ b/drivers/net/phy/realtek/realtek_main.c @@ -144,6 +144,7 @@ #define RTL822X_VND2_TO_PAGE(reg) ((reg) >> 4) #define RTL822X_VND2_TO_PAGE_REG(reg) (16 + (((reg) & GENMASK(3, 0)) >> 1)) +#define RTL822X_VND2_TO_C22_REG(reg) (((reg) - 0xa400) / 2) #define RTL822X_VND2_C22_REG(reg) (0xa400 + 2 * (reg)) #define RTL8221B_VND2_INER 0xa4d2 @@ -1265,6 +1266,11 @@ static int rtl822xb_read_mmd(struct phy_device *phydev, int devnum, u16 reg) return mmd_phy_read(phydev->mdio.bus, phydev->mdio.addr, phydev->is_c45, devnum, reg); + /* Simplify access to C22-registers addressed inside MDIO_MMD_VEND2 */ + if (reg >= RTL822X_VND2_C22_REG(0) && + reg <= RTL822X_VND2_C22_REG(30)) + return __phy_read(phydev, RTL822X_VND2_TO_C22_REG(reg)); + /* Use paged access for MDIO_MMD_VEND2 over Clause-22 */ page = RTL822X_VND2_TO_PAGE(reg); oldpage = __phy_read(phydev, RTL821x_PAGE_SELECT); @@ -1300,6 +1306,11 @@ static int rtl822xb_write_mmd(struct phy_device *phydev, int devnum, u16 reg, return mmd_phy_write(phydev->mdio.bus, phydev->mdio.addr, phydev->is_c45, devnum, reg, val); + /* Simplify access to C22-registers addressed inside MDIO_MMD_VEND2 */ + if (reg >= RTL822X_VND2_C22_REG(0) && + reg <= RTL822X_VND2_C22_REG(30)) + return __phy_write(phydev, RTL822X_VND2_TO_C22_REG(reg), val); + /* Use paged access for MDIO_MMD_VEND2 over Clause-22 */ page = RTL822X_VND2_TO_PAGE(reg); oldpage = __phy_read(phydev, RTL821x_PAGE_SELECT); |