Set bit 0 in register 1C.23 to enable the EDPD feature of the
KSZ9031 PHY. This reduces power consumption when the link is
down. To use this, set "enable-edpd" in the devicetree.
Signed-off-by: Mike Looijmans <mike.looijmans@xxxxxxxx>
---
.../devicetree/bindings/net/micrel-ksz90x1.txt | 6 ++++++
drivers/net/phy/micrel.c | 19 +++++++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt b/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
index f9c32ad..fbec6f8 100644
--- a/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
+++ b/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
@@ -56,6 +56,11 @@ KSZ9031:
- txd2-skew-ps : Skew control of TX data 2 pad
- txd3-skew-ps : Skew control of TX data 3 pad
+ Boolean:
+
+ - enable-edpd : Not related to timing. Specify this property to enable
+ energy-detect power-down mode in the PHY.
+
Examples:
mdio {
@@ -64,6 +69,7 @@ Examples:
rxdv-skew-ps = <0>;
txc-skew-ps = <3000>;
txen-skew-ps = <0>;
+ enable-edpd;
reg = <0>;
};
};
diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 4516c8a..0a365b4 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -409,6 +409,10 @@ static int ksz9021_config_init(struct phy_device *phydev)
#define MII_KSZ9031RN_TX_DATA_PAD_SKEW 6
#define MII_KSZ9031RN_CLK_PAD_SKEW 8
+/* MMD Address 0x1C */
+#define MII_KSZ9031RN_EDPD 0x23
+#define MII_KSZ9031RN_EDPD_ENABLE BIT(0)
+
static int ksz9031_extended_write(struct phy_device *phydev,
u8 mode, u32 dev_addr, u32 regnum, u16 val)
{
@@ -480,6 +484,18 @@ static int ksz9031_center_flp_timing(struct phy_device *phydev)
return genphy_restart_aneg(phydev);
}
+/* Enable energy-detect power-down mode */
+static int ksz9031_enable_edpd(struct phy_device *phydev)
+{
+ int reg;
+
+ reg = ksz9031_extended_read(phydev, OP_DATA, 0x1C, MII_KSZ9031RN_EDPD);
+ if (reg < 0)
+ return reg;
+ return ksz9031_extended_write(phydev, OP_DATA, 0x1C, MII_KSZ9031RN_EDPD,
+ reg | MII_KSZ9031RN_EDPD_ENABLE);
+}
+
static int ksz9031_config_init(struct phy_device *phydev)
{
const struct device *dev = &phydev->mdio.dev;
@@ -522,6 +538,9 @@ static int ksz9031_config_init(struct phy_device *phydev)
ksz9031_of_load_skew_values(phydev, of_node,
MII_KSZ9031RN_TX_DATA_PAD_SKEW, 4,
tx_data_skews, 4);
+
+ if (of_property_read_bool(of_node, "enable-edpd"))
+ ksz9031_enable_edpd(phydev);
}
return ksz9031_center_flp_timing(phydev);
--
1.9.1
--
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