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The Fast Ethernet PHYs present in the MT7628 SoCs require an undocumented bit to be set before they can establish 100mbps links. This commit adds the Kconfig option MEDIATEK_FE_SOC_PHY and the corresponding driver mtk-fe-soc.c. Signed-off-by: Joris Vaisvila <joey@tinyisr.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Daniel Golle <daniel@makrotopia.org> Link: https://patch.msgid.link/20260813190241.789323-3-joey@tinyisr.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for MT7628 Embedded Switch internal Fast Ethernet PHYs
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*/
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#include <linux/module.h>
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#include <linux/phy.h>
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#define MTK_FPHY_ID_MT7628 0x03a29410
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#define MTK_EXT_PAGE_ACCESS 0x1f
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static int mt7628_phy_read_page(struct phy_device *phydev)
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{
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return __phy_read(phydev, MTK_EXT_PAGE_ACCESS);
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}
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static int mt7628_phy_write_page(struct phy_device *phydev, int page)
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{
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return __phy_write(phydev, MTK_EXT_PAGE_ACCESS, page);
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}
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static int mt7628_phy_config_init(struct phy_device *phydev)
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{
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/*
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* This undocumented bit is required for the PHYs to be able to
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* establish 100mbps links.
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*/
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return phy_modify_paged(phydev, 0x8000, 30, BIT(13), BIT(13));
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}
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static struct phy_driver mtk_soc_fe_phy_driver[] = {
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{
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PHY_ID_MATCH_EXACT(MTK_FPHY_ID_MT7628),
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.name = "MediaTek MT7628 PHY",
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.config_init = mt7628_phy_config_init,
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.read_page = mt7628_phy_read_page,
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.write_page = mt7628_phy_write_page,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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},
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};
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module_phy_driver(mtk_soc_fe_phy_driver);
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static const struct mdio_device_id __maybe_unused mtk_soc_fe_phy_tbl[] = {
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{ PHY_ID_MATCH_EXACT(MTK_FPHY_ID_MT7628) },
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{ }
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};
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MODULE_DESCRIPTION("MediaTek SoC Fast Ethernet PHY driver");
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MODULE_AUTHOR("Joris Vaisvila <joey@tinyisr.com>");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(mdio, mtk_soc_fe_phy_tbl);
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