[PATCH net-next v4 1/2] net: phy: marvell10g: implement suspend/resume callbacks

[Antoine Tenart <antoine.tenart@bootlin.com>]

This patch adds the suspend/resume callbacks for Marvell 10G PHYs. The
three PCS (base-t, base-r and 1000base-x) are set in low power (the PCS
are powered down) when the PHY isn't used.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
---
 drivers/net/phy/marvell10g.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 80678919641d..9ee033c8a12b 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -51,6 +51,8 @@ enum {
 	MV_AN_STAT1000		= 0x8001, /* 1000base-T status register */
 
 	/* Vendor2 MMD registers */
+	MV_V2_PORT_CTRL		= 0xf001,
+	MV_V2_PORT_CTRL_PWRDOWN = 0x0800,
 	MV_V2_TEMP_CTRL		= 0xf08a,
 	MV_V2_TEMP_CTRL_MASK	= 0xc000,
 	MV_V2_TEMP_CTRL_SAMPLE	= 0x0000,
@@ -229,11 +231,19 @@ static int mv3310_probe(struct phy_device *phydev)
 
 static int mv3310_suspend(struct phy_device *phydev)
 {
-	return 0;
+	return phy_set_bits_mmd(phydev, MDIO_MMD_VEND2, MV_V2_PORT_CTRL,
+				MV_V2_PORT_CTRL_PWRDOWN);
 }
 
 static int mv3310_resume(struct phy_device *phydev)
 {
+	int ret;
+
+	ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2, MV_V2_PORT_CTRL,
+				 MV_V2_PORT_CTRL_PWRDOWN);
+	if (ret)
+		return ret;
+
 	return mv3310_hwmon_config(phydev, true);
 }
 
-- 
2.20.1