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Add support for reading Signal Quality Indicator (SQI) and enhanced SQI+ from OATC14 10Base-T1S PHYs. - Introduce MDIO register definitions for DCQ_SQI and DCQ_SQIPLUS. - Add `genphy_c45_oatc14_get_sqi_max()` to return the maximum supported SQI/SQI+ level. - Add `genphy_c45_oatc14_get_sqi()` to return the current SQI or SQI+ value. - Update `include/linux/phy.h` to expose the new APIs. SQI+ capability is read from the Advanced Diagnostic Features Capability register (ADFCAP). If SQI+ is supported, the driver calculates the value from the MSBs of the DCQ_SQIPLUS register; otherwise, it falls back to basic SQI (0-7 levels). This enables ethtool to report the SQI value for OATC14 10Base-T1S PHYs. Open Alliance TC14 10BASE-T1S Advanced Diagnostic PHY Features Specification ref: https://opensig.org/wp-content/uploads/2025/06/OPEN_Alliance_10BASE-T1S_Advanced_PHY_features_for-automotive_Ethernet_V2.1b.pdf Signed-off-by: Parthiban Veerasooran <parthiban.veerasooran@microchip.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://patch.msgid.link/20251201032346.6699-2-parthiban.veerasooran@microchip.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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