From: Martin Fuzzey martin.fuzzey@flowbird.group
[ Upstream commit 76db2d466f6a929a04775f0f87d837e3bcba44e8 ]
The LAN8740, like the 8720, also requires a reset after enabling clock. The datasheet [1] 3.8.5.1 says: "During a Hardware reset, an external clock must be supplied to the XTAL1/CLKIN signal."
I have observed this issue on a custom i.MX6 based board with the LAN8740A.
[1] http://ww1.microchip.com/downloads/en/DeviceDoc/8740a.pdf
Signed-off-by: Martin Fuzzey martin.fuzzey@flowbird.group Reviewed-by: Andrew Lunn andrew@lunn.ch Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/phy/smsc.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c index dc3d92d340c4d..b732982507939 100644 --- a/drivers/net/phy/smsc.c +++ b/drivers/net/phy/smsc.c @@ -327,6 +327,7 @@ static struct phy_driver smsc_phy_driver[] = { .name = "SMSC LAN8740",
/* PHY_BASIC_FEATURES */ + .flags = PHY_RST_AFTER_CLK_EN,
.probe = smsc_phy_probe,