From nobody Thu Apr 2 18:53:21 2026 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3DFD6389472; Thu, 26 Feb 2026 08:25:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=68.232.153.233 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772094316; cv=none; b=eq6jzXXmYteIhe/0Sex3H9YU647XVhhjZxPnteC3vb2oTJlYJNhOhngV5iI1Mh6UMHnBjAqiKLXxPqd+2bMDq//P+wY5M/GELuPEFCLw/nXLj3146aC//8UjoqJhPldrt+qYwifQwCxq6GbdV9HCaXDKHycpc1WvxOXvX4y2GG8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772094316; c=relaxed/simple; bh=5WE9l9UiTHF6wsTrenilaLPEXT2Xsys2WieYDSX1L/s=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:To:CC; b=aUrCwo2QXDZ84iOa8GI45XUcMh/9wdJDM11jaIHk6cZTKtOAefw3xmGFkYM3homWtNvHkEsdfHNbviDBS1muFYVHnXwDZCCOK7FDH7oW1wvW4FcCrpzCx1i9fWWeG4YLaSd+M77/aCNKVAdzpcxKIzSvkUE6+Jgm0IIuCmPOu/E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=microchip.com; spf=pass smtp.mailfrom=microchip.com; dkim=pass (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b=REbqaITP; arc=none smtp.client-ip=68.232.153.233 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=microchip.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=microchip.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b="REbqaITP" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1772094314; x=1803630314; h=from:date:subject:mime-version:content-transfer-encoding: message-id:to:cc; bh=5WE9l9UiTHF6wsTrenilaLPEXT2Xsys2WieYDSX1L/s=; b=REbqaITP3gCtMWxHJeNekrZT91M0aob0v9OhmqDJIDjTwETwciqhHQcZ L1tGuAV3zMjwPYy/0irwUCskvkfPJQhePW297vSyfMc9yGrxZi6naQsV2 kxZkUSwXgzbiv9Dd3RG/L7dIlpiTtZ5knH6bFcrghnLyXl9M4FJNzuC5G /Gpizp4vroSRGNRK2CP8rHHNZKlyyQnI+9bOXKq0iQC04cUB1z+NN/xmt 5Uz9HRM7IoFjYdshplcWnryrtul4M5QTJ+TflSN/SToj0RGuH1Q9o1Zdv SqxzoUjSih/ssFVVaxIg+j2ozzas4Y2CpjORQpIP+aDNWOfARh2nyss5K A==; X-CSE-ConnectionGUID: FecGyIzkSKSFqyjWV6mfEg== X-CSE-MsgGUID: VN5qe9paSv2mvxfTb2x9Gg== X-IronPort-AV: E=Sophos;i="6.21,312,1763449200"; d="scan'208";a="53897152" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa3.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Feb 2026 01:25:13 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.87.72) by chn-vm-ex3.mchp-main.com (10.10.87.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.35; Thu, 26 Feb 2026 01:24:43 -0700 Received: from [127.0.0.1] (10.10.85.11) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.58 via Frontend Transport; Thu, 26 Feb 2026 01:24:41 -0700 From: =?utf-8?q?Jens_Emil_Schulz_=C3=98stergaard?= Date: Thu, 26 Feb 2026 09:24:19 +0100 Subject: [PATCH net-next v3] net: phy: micrel: Add support for lan9645x internal phy Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20260226-phy_micrel_add_support_for_lan9645x_internal_phy-v3-1-1fe82379962b@microchip.com> X-B4-Tracking: v=1; b=H4sIADIDoGkC/53OQQ7CIBAF0KsY1mIKxdq68h7GEEoHO0kFAti0M b27WDfGnS4nf/68eZAIASGS4+ZBAowY0dk8lNsN0b2yV6DY5ZnwglcFY4L6fpY31AEGqbpOxrv 3LiRpXJCDsk0l9pNEmyBYNci8TCswjTrUXLd1S/JZH8DgtJJnYiFRC1Mil5z0GJML8/rLyNb8z fLyd3ZklNFa1KJlaq8Opju96k736Hfa3VZw5B9IWfyB8IzkutIl06bR4htZluUJaklyFWMBAAA = To: Andrew Lunn , Heiner Kallweit , Russell King , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Horatiu Vultur , , Steen Hegelund , Daniel Machon CC: , , =?utf-8?q?Jens_Emil_Schulz_=C3=98stergaard?= X-Mailer: b4 0.15-dev LAN9645X is a family of switch chips with 5 internal copper phys. The internal PHY is based on parts of LAN8832. This is a low-power, single port triple-speed (10BASE-T/100BASE-TX/1000BASE-T) ethernet physical layer transceiver (PHY) that supports transmission and reception of data on standard CAT-5, as well as CAT-5e and CAT-6 Unshielded Twisted Pair (UTP) cables. Add support for the internal PHY of the lan9645x chip family. Reviewed-by: Steen Hegelund Reviewed-by: Daniel Machon Signed-off-by: Jens Emil Schulz =C3=98stergaard Reviewed-by: Andrew Lunn --- Changes in v3: - Fix error with phy_modify usage in lan9645x_suspend, and switch to phy_set_bits. - Shorten register and field name macros for software soft reset. - Link to v2: https://lore.kernel.org/r/20260130-phy_micrel_add_support_for= _lan9645x_internal_phy-v2-1-202ac31cf9c4@microchip.com Changes in v2: - Check write errors in lan9645x_config_intr. - Added more comments for the erratas which are not yet documented in the datasheet. - Change workaround in lan9645x_suspend from ANEG restart and sleep to asserting Software Soft Reset and poll for self-clear. - Return IRQ_NONE when IRQ is not handled in lan9645x_handle_interrupt. - Link to v1: https://lore.kernel.org/r/20260123-phy_micrel_add_support_for= _lan9645x_internal_phy-v1-1-8484b1a5a7fd@microchip.com --- drivers/net/phy/micrel.c | 152 +++++++++++++++++++++++++++++++++++++++++= ++++ include/linux/micrel_phy.h | 1 + 2 files changed, 153 insertions(+) diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c index 663dcdc92204..84a7e95bbf16 100644 --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -6523,6 +6523,142 @@ static void lan8842_get_phy_stats(struct phy_device= *phydev, stats->tx_errors =3D priv->phy_stats.tx_errors; } =20 +#define LAN9645X_CTRL_REG 0x1f +#define LAN9645X_CTRL_REG_SW_SOFT_RST BIT(1) + +#define LAN9645X_DAC_ICAS_AMP_POWER_DOWN 0x47 +#define LAN9645X_BTRX_QBIAS_POWER_DOWN 0x46 +#define LAN9645X_TX_LOW_I_CH_CD_POWER_MGMT 0x45 +#define LAN9645X_TX_LOW_I_CH_B_POWER_MGMT 0x44 +#define LAN9645X_TX_LOW_I_CH_A_POWER_MGMT 0x43 + +static const struct lanphy_reg_data force_dac_tx_errata[] =3D { + /* Force channel A/B/C/D TX on */ + { LAN8814_PAGE_POWER_REGS, + LAN9645X_DAC_ICAS_AMP_POWER_DOWN, + 0 }, + /* Force channel A/B/C/D QBias on */ + { LAN8814_PAGE_POWER_REGS, + LAN9645X_BTRX_QBIAS_POWER_DOWN, + 0xaa }, + /* Tx low I on channel C/D overwrite */ + { LAN8814_PAGE_POWER_REGS, + LAN9645X_TX_LOW_I_CH_CD_POWER_MGMT, + 0xbfff }, + /* Channel B low I overwrite */ + { LAN8814_PAGE_POWER_REGS, + LAN9645X_TX_LOW_I_CH_B_POWER_MGMT, + 0xabbf }, + /* Channel A low I overwrite */ + { LAN8814_PAGE_POWER_REGS, + LAN9645X_TX_LOW_I_CH_A_POWER_MGMT, + 0xbd3f }, +}; + +static int lan9645x_config_init(struct phy_device *phydev) +{ + int ret; + + /* Apply erratas from previous generations. */ + ret =3D lan8842_erratas(phydev); + if (ret < 0) + return ret; + + /* Apply errata for an issue where bringing a port down, can cause a few + * CRC errors for traffic flowing through adjacent ports. + */ + return lanphy_write_reg_data(phydev, force_dac_tx_errata, + ARRAY_SIZE(force_dac_tx_errata)); +} + +static int lan9645x_suspend(struct phy_device *phydev) +{ + int ret, val; + + /* Force link down before software power down (SPD), by doing software + * soft reset. This resets the PHY, but keeps all register configuration + * intact. The bit self clears. + * + * This is needed as a workaround for an issue where performing SPD on a + * port can bring adjacent ports down, when there is traffic flowing + * through the ports. + */ + ret =3D phy_set_bits(phydev, LAN9645X_CTRL_REG, + LAN9645X_CTRL_REG_SW_SOFT_RST); + if (ret) + return ret; + + ret =3D phy_read_poll_timeout(phydev, LAN9645X_CTRL_REG, val, + !(val & LAN9645X_CTRL_REG_SW_SOFT_RST), + 3000, 100000, true); + if (ret) + return ret; + + return genphy_suspend(phydev); +} + +static int lan9645x_config_intr(struct phy_device *phydev) +{ + int err; + + /* enable / disable interrupts */ + if (phydev->interrupts =3D=3D PHY_INTERRUPT_ENABLED) { + /* This is an internal PHY of lan9645x and is not possible to + * change the polarity of irq sources in the OIC (CPU_INTR) + * found in lan9645x. Therefore change the polarity of the + * interrupt in the PHY from being active low instead of active + * high. + */ + err =3D phy_write(phydev, LAN8804_CONTROL, + LAN8804_CONTROL_INTR_POLARITY); + if (err) + return err; + + /* By default interrupt buffer is open-drain in which case the + * interrupt can be active only low. Therefore change the + * interrupt buffer to be push-pull to be able to change + * interrupt polarity. + */ + err =3D phy_write(phydev, LAN8804_OUTPUT_CONTROL, + LAN8804_OUTPUT_CONTROL_INTR_BUFFER); + if (err) + return err; + + err =3D lan8814_ack_interrupt(phydev); + if (err) + return err; + + err =3D phy_write(phydev, LAN8814_INTC, + LAN8814_INT_LINK | LAN8814_INT_FLF); + } else { + err =3D phy_write(phydev, LAN8814_INTC, 0); + if (err) + return err; + + err =3D lan8814_ack_interrupt(phydev); + } + + return err; +} + +static irqreturn_t lan9645x_handle_interrupt(struct phy_device *phydev) +{ + int status; + + status =3D phy_read(phydev, LAN8814_INTS); + if (status < 0) { + phy_error(phydev); + return IRQ_NONE; + } + + if (status & (LAN8814_INT_LINK | LAN8814_INT_FLF)) { + phy_trigger_machine(phydev); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + static struct phy_driver ksphy_driver[] =3D { { PHY_ID_MATCH_MODEL(PHY_ID_KS8737), @@ -6761,6 +6897,21 @@ static struct phy_driver ksphy_driver[] =3D { .set_tunable =3D lan8842_set_tunable, .cable_test_start =3D lan8814_cable_test_start, .cable_test_get_status =3D ksz886x_cable_test_get_status, +}, { + PHY_ID_MATCH_MODEL(PHY_ID_LAN9645X), + .name =3D "Microchip LAN9645X Gigabit PHY", + .config_init =3D lan9645x_config_init, + .driver_data =3D &ksz9021_type, + .probe =3D kszphy_probe, + .soft_reset =3D genphy_soft_reset, + .suspend =3D lan9645x_suspend, + .resume =3D genphy_resume, + .config_intr =3D lan9645x_config_intr, + .handle_interrupt =3D lan9645x_handle_interrupt, + .get_tunable =3D lan8842_get_tunable, + .set_tunable =3D lan8842_set_tunable, + .get_phy_stats =3D lan8842_get_phy_stats, + .update_stats =3D lan8842_update_stats, }, { PHY_ID_MATCH_MODEL(PHY_ID_KSZ9131), .name =3D "Microchip KSZ9131 Gigabit PHY", @@ -6859,6 +7010,7 @@ static const struct mdio_device_id __maybe_unused mic= rel_tbl[] =3D { { PHY_ID_MATCH_MODEL(PHY_ID_LAN8804) }, { PHY_ID_MATCH_MODEL(PHY_ID_LAN8841) }, { PHY_ID_MATCH_MODEL(PHY_ID_LAN8842) }, + { PHY_ID_MATCH_MODEL(PHY_ID_LAN9645X) }, { } }; =20 diff --git a/include/linux/micrel_phy.h b/include/linux/micrel_phy.h index ca691641788b..9c6f9817383f 100644 --- a/include/linux/micrel_phy.h +++ b/include/linux/micrel_phy.h @@ -33,6 +33,7 @@ #define PHY_ID_LAN8804 0x00221670 #define PHY_ID_LAN8841 0x00221650 #define PHY_ID_LAN8842 0x002216C0 +#define PHY_ID_LAN9645X 0x002216D0 =20 #define PHY_ID_KSZ886X 0x00221430 #define PHY_ID_KSZ8863 0x00221435 --- base-commit: 8bf22c33e7a172fbc72464f4cc484d23a6b412ba change-id: 20260114-phy_micrel_add_support_for_lan9645x_internal_phy-6ef9a7= 82cb8b Best regards, --=20 Jens Emil Schulz =C3=98stergaard