Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
Merge branch 'net-phy-adin-enable-configuration-of-the-lp-termination-register'
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>
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Documentation/devicetree/bindings/net/adi,adin.yaml
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Documentation/devicetree/bindings/net/adi,adin.yaml
···
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description: Enable 25MHz reference clock output on CLK25_REF pin.
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type: boolean
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adi,low-cmode-impedance:
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description: |
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Configure PHY for the lowest common-mode impedance on the receive pair
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for 100BASE-TX. This is suited for capacitive coupled applications and
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other applications where there may be a path for high common-mode noise
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to reach the PHY.
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If not present, by default the PHY is configured for normal termination
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(zero-power termination) mode.
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Note: There is a trade-off of 12 mW increased power consumption with
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the lowest common-mode impedance setting, but in all cases the
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differential impedance is 100 ohms.
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type: boolean
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unevaluatedProperties: false
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examples:
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drivers/net/phy/adin.c
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drivers/net/phy/adin.c
···
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#define ADIN1300_CLOCK_STOP_REG 0x9400
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#define ADIN1300_LPI_WAKE_ERR_CNT_REG 0xa000
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#define ADIN1300_B_100_ZPTM_DIMRX 0xB685
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#define ADIN1300_B_100_ZPTM_EN_DIMRX BIT(0)
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#define ADIN1300_CDIAG_RUN 0xba1b
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#define ADIN1300_CDIAG_RUN_EN BIT(0)
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···
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ADIN1300_GE_CLK_CFG_MASK, sel);
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}
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static int adin_config_zptm100(struct phy_device *phydev)
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{
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struct device *dev = &phydev->mdio.dev;
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if (!(device_property_read_bool(dev, "adi,low-cmode-impedance")))
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return 0;
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/* clear bit 0 to configure for lowest common-mode impedance */
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return phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
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ADIN1300_B_100_ZPTM_DIMRX,
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ADIN1300_B_100_ZPTM_EN_DIMRX);
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}
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static int adin_config_init(struct phy_device *phydev)
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{
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int rc;
···
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return rc;
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rc = adin_config_clk_out(phydev);
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if (rc < 0)
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return rc;
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rc = adin_config_zptm100(phydev);
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if (rc < 0)
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return rc;
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