[PATCH net v3 2/3] net: phy: dp83td510: handle the active-high LED polarity mode

[Donggeun Yoo <donggeunyoo.kernel@gmail.com>]

dp83td510_led_polarity_set() only recognizes PHY_LED_ACTIVE_LOW, so
PHY_LED_ACTIVE_HIGH falls through to the default case and returns -EINVAL.
of_phy_led() propagates the error, of_phy_leds() drops the LEDs registered
so far and passes it on, and phy_probe() returns it. A device tree marking
a DP83TD510 LED as 'active-high', which leds/common.yaml allows and
ethernet-phy.yaml references for led@N nodes, thus leaves the mdio device
unbound, so phy_attach_direct() falls back to the genphy driver, which
cannot drive this 10BASE-T1L single-mode PHY, so the interface has no
usable link.

The callback initializes polarity to DP83TD510E_LED_POLARITY(index), which
is the active-high setting, so the request is already satisfied and only
the case label is missing.

Cc: stable@vger.kernel.org
Fixes: 5b281fe7e396 ("net: phy: dp83td510: introduce LED framework support")
Assisted-by: Claude:claude-fable-5
Signed-off-by: Donggeun Yoo <donggeunyoo.kernel@gmail.com>
---
 drivers/net/phy/dp83td510.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/phy/dp83td510.c b/drivers/net/phy/dp83td510.c
index d75dae6071ad..9e9a41bf6457 100644
--- a/drivers/net/phy/dp83td510.c
+++ b/drivers/net/phy/dp83td510.c
@@ -439,6 +439,9 @@ static int dp83td510_led_polarity_set(struct phy_device *phydev, int index,
 		case PHY_LED_ACTIVE_LOW:
 			polarity = 0;
 			break;
+		case PHY_LED_ACTIVE_HIGH:
+			polarity = DP83TD510E_LED_POLARITY(index);
+			break;
 		default:
 			return -EINVAL;
 		}
-- 
2.53.0