[PATCH net-next v2 2/3] net: macb: add support for reporting SGMII inband link status

[Charles Perry <charles.perry@microchip.com>]

This makes it possible to use in-band autonegotiation with
SGMII.

If using a device tree, this can be done by adding the managed =
"in-band-status" property to the gem node.

Signed-off-by: Charles Perry <charles.perry@microchip.com>
---

Notes:
    Changes in v2:
      * Move my notes to the cover letter

 drivers/net/ethernet/cadence/macb_main.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index f4250e76cef0..f6efc1bb88b6 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -560,7 +560,12 @@ static int macb_usx_pcs_config(struct phylink_pcs *pcs,
 static void macb_pcs_get_state(struct phylink_pcs *pcs, unsigned int neg_mode,
 			       struct phylink_link_state *state)
 {
-	state->link = 0;
+	struct macb *bp = container_of(pcs, struct macb, phylink_sgmii_pcs);
+	u16 bmsr, lpa;
+
+	bmsr = gem_readl(bp, PCSSTS);
+	lpa = gem_readl(bp, PCSANLPBASE);
+	phylink_mii_c22_pcs_decode_state(state, neg_mode, bmsr, lpa);
 }
 
 static void macb_pcs_an_restart(struct phylink_pcs *pcs)
-- 
2.47.3