[PATCH 05/18] km/ls102xa: dbg phy prst depends on piggy presence

Aleksandar Gerasimovski aleksandar.gerasimovski at hitachienergy.com
Tue Nov 16 13:51:47 CET 2021

The PHY for the debug interface was placed on the board for the
pg_wcom_ls102x. Hence only when a piggy is plugged, a RJ45 jack
including magnetics is connected to the MDI of the PHY. Without a
piggy the MDI lines are left floating and it does not make sense to
have an active debug PHY.
In case of expu1 an active PHY without a piggy even led to increased
jitter for syncE.

This patch only deactivates the prst line of the debug PHY when a piggy
is detected persent.

Signed-off-by: Rainer Boschung <rainer.boschung at hitachienergy.com>
Signed-off-by: Aleksandar Gerasimovski <aleksandar.gerasimovski at hitachienergy.com>
 board/keymile/pg-wcom-ls102xa/pg-wcom-ls102xa.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/board/keymile/pg-wcom-ls102xa/pg-wcom-ls102xa.c b/board/keymile/pg-wcom-ls102xa/pg-wcom-ls102xa.c
index 2be2b64..cff18dc 100644
--- a/board/keymile/pg-wcom-ls102xa/pg-wcom-ls102xa.c
+++ b/board/keymile/pg-wcom-ls102xa/pg-wcom-ls102xa.c
@@ -91,8 +91,10 @@ int board_early_init_f(void)
 	qrio_prst(WCOM_CLIPS_RST, false, false);
+	/* deasset debug phy reset only if piggy is present */
-	qrio_prst(KM_DBG_ETH_RST, false, false);
+	qrio_prst(KM_DBG_ETH_RST, !qrio_get_pgy_pres_pin(), false);

More information about the U-Boot mailing list