This patch series adds Signal Quality Indicator (SQI) and enhanced SQI+
support for OATC14 10Base-T1S PHYs, along with integration into the
Microchip T1S PHY driver. This enables ethtool to report the SQI value for
OATC14 10Base-T1S PHYs.

Patch Summary:
1. add SQI and SQI+ support for OATC14 10Base-T1S PHYs
   - Introduces MDIO register definitions for DCQ_SQI and DCQ_SQIPLUS.
   - Adds genphy_c45_oatc14_get_sqi_max() to report the maximum SQI/SQI+
     level.
   - Adds genphy_c45_oatc14_get_sqi() to return the current SQI or SQI+
     value.
   - Updates include/linux/phy.h to expose the new APIs.
   - SQI+ capability is read from the Advanced Diagnostic Features
     Capability register (ADFCAP). If unsupported, the driver falls back
     to basic SQI (0–7 levels).
   - If SQI+ capability is supported, the function returns the extended
     SQI+ value; otherwise, it returns the basic SQI value.
   - Open Alliance TC14 10BASE-T1S Advanced Diagnostic PHY Features.
     https://opensig.org/wp-content/uploads/2025/06/OPEN_Alliance_10BASE-T1S_Advanced_PHY_features_for-automotive_Ethernet_V2.1b.pdf
	
2. add SQI support for LAN867x Rev.D0 PHYs
   - Registers .get_sqi and .get_sqi_max callbacks in the Microchip T1S
     driver.
   - Enables network drivers and diagnostic tools to query link signal
     quality for LAN867x Rev.D0 PHYs.
   - Existing PHY functionality remains unchanged.

v2:
 - Updated cover letter description for better clarity.
 - Added oatc14_sqiplus_bits variable to cache the SQI+ capability in the
   phy device structure.
 - Fixed function description comment style warnings reported by the
   kernel test robot.

v3:
 - Reworked SQI/SQI+ update sequencing to address the issue,
   oatc14_sqiplus_bits being 0 until after
   genphy_c45_oatc14_get_sqi_max() is called.

v4:
 - Added the missing description for the  member
    to fix the kernel-doc warning.


Parthiban Veerasooran (2):
  net: phy: phy-c45: add SQI and SQI+ support for OATC14 10Base-T1S PHYs
  net: phy: microchip_t1s: add SQI support for LAN867x Rev.D0 PHYs

 drivers/net/phy/mdio-open-alliance.h |  13 +++
 drivers/net/phy/microchip_t1s.c      |   2 +
 drivers/net/phy/phy-c45.c            | 137 +++++++++++++++++++++++++++
 include/linux/phy.h                  |  29 ++++++
 4 files changed, 181 insertions(+)


base-commit: 0177f0f07886e54e12c6f18fa58f63e63ddd3c58
-- 
2.34.1