net: phy: smsc: LAN8740: add PHY_RST_AFTER_CLK_EN flag

[ 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>

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index dc3d92d340c4d7a019c53706c96b0513cee13356..b732982507939563d08a49f7c6ec22d86f1b0dcf 100644 (file)
--- 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,