diff options
| author | Osose Itua <osose.itua@savoirfairelinux.com> | 2026-01-08 01:16:53 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-01-16 06:36:04 +0300 |
| commit | a6733836527da97767aa7cdd2d3c6984460afdb3 (patch) | |
| tree | 40e6f274bd6440a00967110462698daa9610d490 | |
| parent | 7376ba2db168c9e83f90e68f5f85c7d7f5645164 (diff) | |
| download | linux-a6733836527da97767aa7cdd2d3c6984460afdb3.tar.xz | |
net: phy: adin: enable configuration of the LP Termination Register
The ADIN1200/ADIN1300 provide a control bit that selects between normal
receive termination and the lowest common mode impedance for 100BASE-TX
operation. This behavior is controlled through the Low Power Termination
register (B_100_ZPTM_EN_DIMRX).
Bit 0 of this register enables normal termination when set (this is the
default), and selects the lowest common mode impedance when cleared.
Signed-off-by: Osose Itua <osose.itua@savoirfairelinux.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20260107221913.1334157-3-osose.itua@savoirfairelinux.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | drivers/net/phy/adin.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c index 7fa713ca8d45..3a934051b574 100644 --- a/drivers/net/phy/adin.c +++ b/drivers/net/phy/adin.c @@ -89,6 +89,9 @@ #define ADIN1300_CLOCK_STOP_REG 0x9400 #define ADIN1300_LPI_WAKE_ERR_CNT_REG 0xa000 +#define ADIN1300_B_100_ZPTM_DIMRX 0xB685 +#define ADIN1300_B_100_ZPTM_EN_DIMRX BIT(0) + #define ADIN1300_CDIAG_RUN 0xba1b #define ADIN1300_CDIAG_RUN_EN BIT(0) @@ -522,6 +525,19 @@ static int adin_config_clk_out(struct phy_device *phydev) ADIN1300_GE_CLK_CFG_MASK, sel); } +static int adin_config_zptm100(struct phy_device *phydev) +{ + struct device *dev = &phydev->mdio.dev; + + if (!(device_property_read_bool(dev, "adi,low-cmode-impedance"))) + return 0; + + /* clear bit 0 to configure for lowest common-mode impedance */ + return phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1, + ADIN1300_B_100_ZPTM_DIMRX, + ADIN1300_B_100_ZPTM_EN_DIMRX); +} + static int adin_config_init(struct phy_device *phydev) { int rc; @@ -548,6 +564,10 @@ static int adin_config_init(struct phy_device *phydev) if (rc < 0) return rc; + rc = adin_config_zptm100(phydev); + if (rc < 0) + return rc; + phydev_dbg(phydev, "PHY is using mode '%s'\n", phy_modes(phydev->interface)); |