[RFC PATCH net-next 8/8] net: phy: realtek: setup ALDPS on RTL822x

[Daniel Golle <daniel@makrotopia.org>]

Setup Link Down Power Saving Mode according the DTS property
just like for RTL821x 1GE PHYs.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 drivers/net/phy/realtek.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index de73049037891..a2324918c42db 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -62,6 +62,10 @@
 #define RTL8221B_SERDES_OPTION_MODE_2500BASEX		2
 #define RTL8221B_SERDES_OPTION_MODE_HISGMII		3
 
+#define RTL8221B_PHYCR1				0xa430
+#define RTL8221B_PHYCR1_ALDPS_EN		BIT(2)
+#define RTL8221B_PHYCR1_ALDPS_XTAL_OFF_EN	BIT(12)
+
 #define RTL8366RB_POWER_SAVE			0x15
 #define RTL8366RB_POWER_SAVE_ON			BIT(12)
 
@@ -744,6 +748,25 @@ static int rtl8226_match_phy_device(struct phy_device *phydev)
 	       rtlgen_supports_2_5gbps(phydev);
 }
 
+static int rtl822x_probe(struct phy_device *phydev)
+{
+	struct device *dev = &phydev->mdio.dev;
+	int val;
+
+	val = phy_read_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, RTL8221B_PHYCR1);
+	if (val < 0)
+		return val;
+
+	if (of_property_read_bool(dev->of_node, "realtek,aldps-enable"))
+		val |= RTL8221B_PHYCR1_ALDPS_EN | RTL8221B_PHYCR1_ALDPS_XTAL_OFF_EN;
+	else
+		val &= ~(RTL8221B_PHYCR1_ALDPS_EN | RTL8221B_PHYCR1_ALDPS_XTAL_OFF_EN);
+
+	phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, RTL8221B_PHYCR1, val);
+
+	return 0;
+}
+
 static int rtlgen_resume(struct phy_device *phydev)
 {
 	int ret = genphy_resume(phydev);
@@ -1029,6 +1052,7 @@ static struct phy_driver realtek_drvs[] = {
 		.match_phy_device = rtl8226_match_phy_device,
 		.get_features	= rtl822x_get_features,
 		.config_aneg	= rtl822x_config_aneg,
+		.probe          = rtl822x_probe,
 		.read_status	= rtl822x_read_status,
 		.suspend	= genphy_suspend,
 		.resume		= rtlgen_resume,
@@ -1042,6 +1066,7 @@ static struct phy_driver realtek_drvs[] = {
 		.name		= "RTL8226B_RTL8221B 2.5Gbps PHY",
 		.get_features	= rtl822x_get_features,
 		.config_aneg	= rtl822x_config_aneg,
+		.probe          = rtl822x_probe,
 		.read_status	= rtl822x_read_status,
 		.suspend	= genphy_suspend,
 		.resume		= rtlgen_resume,
@@ -1055,6 +1080,7 @@ static struct phy_driver realtek_drvs[] = {
 		.name           = "RTL8226-CG 2.5Gbps PHY",
 		.get_features   = rtl822x_get_features,
 		.config_aneg    = rtl822x_config_aneg,
+		.probe          = rtl822x_probe,
 		.read_status    = rtl822x_read_status,
 		.suspend        = genphy_suspend,
 		.resume         = rtlgen_resume,
@@ -1066,6 +1092,7 @@ static struct phy_driver realtek_drvs[] = {
 		.name           = "RTL8226B-CG_RTL8221B-CG 2.5Gbps PHY",
 		.get_features   = rtl822x_get_features,
 		.config_aneg    = rtl822x_config_aneg,
+		.probe          = rtl822x_probe,
 		.read_status    = rtl822x_read_status,
 		.suspend        = genphy_suspend,
 		.resume         = rtlgen_resume,
@@ -1078,6 +1105,7 @@ static struct phy_driver realtek_drvs[] = {
 		.get_features   = rtl822x_get_features,
 		.config_init    = rtl8221b_config_init,
 		.config_aneg    = rtl822x_config_aneg,
+		.probe          = rtl822x_probe,
 		.read_status    = rtl822x_read_status,
 		.suspend        = genphy_suspend,
 		.resume         = rtlgen_resume,
@@ -1090,6 +1118,7 @@ static struct phy_driver realtek_drvs[] = {
 		.get_features   = rtl822x_get_features,
 		.config_aneg    = rtl822x_config_aneg,
 		.config_init    = rtl8221b_config_init,
+		.probe          = rtl822x_probe,
 		.read_status    = rtl822x_read_status,
 		.suspend        = genphy_suspend,
 		.resume         = rtlgen_resume,
-- 
2.40.0