[PATCH net-next v1 2/2] net: phy: tja11xx: add SQI support

[Oleksij Rempel]

This patch implements reading of the Signal Quality Index for better
cable/link troubleshooting.

Signed-off-by: Oleksij Rempel <o.rem...@pengutronix.de>
---
 drivers/net/phy/nxp-tja11xx.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/net/phy/nxp-tja11xx.c b/drivers/net/phy/nxp-tja11xx.c
index 0d4f9067ca715..ed588caa563f4 100644
--- a/drivers/net/phy/nxp-tja11xx.c
+++ b/drivers/net/phy/nxp-tja11xx.c
@@ -53,6 +53,7 @@
 
 #define MII_COMMSTAT                   23
 #define MII_COMMSTAT_LINK_UP           BIT(15)
+#define MII_COMMSTAT_SQI_STATE         GENMASK(7, 5)
 
 #define MII_GENSTAT                    24
 #define MII_GENSTAT_PLL_LOCKED         BIT(14)
@@ -329,6 +330,17 @@ static int tja11xx_read_status(struct phy_device *phydev)
        return 0;
 }
 
+static int tja11xx_get_sqi(struct phy_device *phydev)
+{
+       int ret;
+
+       ret = phy_read(phydev, MII_COMMSTAT);
+       if (ret < 0)
+               return ret;
+
+       return FIELD_GET(MII_COMMSTAT_SQI_STATE, ret) + 1;
+}
+
 static int tja11xx_get_sset_count(struct phy_device *phydev)
 {
        return ARRAY_SIZE(tja11xx_hw_stats);
@@ -683,6 +695,7 @@ static struct phy_driver tja11xx_driver[] = {
                .config_aneg    = tja11xx_config_aneg,
                .config_init    = tja11xx_config_init,
                .read_status    = tja11xx_read_status,
+               .get_sqi        = tja11xx_get_sqi,
                .suspend        = genphy_suspend,
                .resume         = genphy_resume,
                .set_loopback   = genphy_loopback,
@@ -699,6 +712,7 @@ static struct phy_driver tja11xx_driver[] = {
                .config_aneg    = tja11xx_config_aneg,
                .config_init    = tja11xx_config_init,
                .read_status    = tja11xx_read_status,
+               .get_sqi        = tja11xx_get_sqi,
                .suspend        = genphy_suspend,
                .resume         = genphy_resume,
                .set_loopback   = genphy_loopback,
@@ -715,6 +729,7 @@ static struct phy_driver tja11xx_driver[] = {
                .config_aneg    = tja11xx_config_aneg,
                .config_init    = tja11xx_config_init,
                .read_status    = tja11xx_read_status,
+               .get_sqi        = tja11xx_get_sqi,
                .match_phy_device = tja1102_p0_match_phy_device,
                .suspend        = genphy_suspend,
                .resume         = genphy_resume,
@@ -736,6 +751,7 @@ static struct phy_driver tja11xx_driver[] = {
                .config_aneg    = tja11xx_config_aneg,
                .config_init    = tja11xx_config_init,
                .read_status    = tja11xx_read_status,
+               .get_sqi        = tja11xx_get_sqi,
                .match_phy_device = tja1102_p1_match_phy_device,
                .suspend        = genphy_suspend,
                .resume         = genphy_resume,
-- 
2.26.2