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Merge branch 'net-phy-adin-enable-configuration-of-the-lp-termination-register'

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Osose Itua says:

====================
net: phy: adin: enable configuration of the LP Termination Register
====================

Link: https://patch.msgid.link/20260107221913.1334157-1-osose.itua@savoirfairelinux.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2026-01-15 19:36:06 -08:00
commit aeb4ceb1e7
2 changed files with 34 additions and 0 deletions
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14
Documentation/devicetree/bindings/net/adi,adin.yaml
View File

@ -52,6 +52,20 @@ properties:
description: Enable 25MHz reference clock output on CLK25_REF pin.
type: boolean
adi,low-cmode-impedance:
description: |
Configure PHY for the lowest common-mode impedance on the receive pair
for 100BASE-TX. This is suited for capacitive coupled applications and
other applications where there may be a path for high common-mode noise
to reach the PHY.
If not present, by default the PHY is configured for normal termination
(zero-power termination) mode.
Note: There is a trade-off of 12 mW increased power consumption with
the lowest common-mode impedance setting, but in all cases the
differential impedance is 100 ohms.
type: boolean
unevaluatedProperties: false
examples:

20
drivers/net/phy/adin.c
View File

@ -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));