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Message-ID: <20190812112350.15242-12-alexandru.ardelean@analog.com>
Date: Mon, 12 Aug 2019 14:23:47 +0300
From: Alexandru Ardelean <alexandru.ardelean@...log.com>
To: <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: <davem@...emloft.net>, <robh+dt@...nel.org>,
<mark.rutland@....com>, <f.fainelli@...il.com>,
<hkallweit1@...il.com>, <andrew@...n.ch>,
Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v4 11/14] net: phy: adin: implement Energy Detect Powerdown mode
The ADIN PHYs support Energy Detect Powerdown mode, which puts the PHY into
a low power mode when there is no signal on the wire (typically cable
unplugged).
This behavior is enabled by default, but can be disabled via device
property.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
drivers/net/phy/adin.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
index ddf0512a9a4d..131a72567f25 100644
--- a/drivers/net/phy/adin.c
+++ b/drivers/net/phy/adin.c
@@ -24,6 +24,11 @@
#define ADIN1300_AUTO_MDI_EN BIT(10)
#define ADIN1300_MAN_MDIX_EN BIT(9)
+#define ADIN1300_PHY_CTRL_STATUS2 0x0015
+#define ADIN1300_NRG_PD_EN BIT(3)
+#define ADIN1300_NRG_PD_TX_EN BIT(2)
+#define ADIN1300_NRG_PD_STATUS BIT(1)
+
#define ADIN1300_INT_MASK_REG 0x0018
#define ADIN1300_INT_MDIO_SYNC_EN BIT(9)
#define ADIN1300_INT_ANEG_STAT_CHNG_EN BIT(8)
@@ -136,6 +141,14 @@ static struct adin_clause45_mmd_map adin_clause45_mmd_map[] = {
{ MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR, ADIN1300_LPI_WAKE_ERR_CNT_REG },
};
+/**
+ * struct adin_priv - ADIN PHY driver private data
+ * edpd_enabled true if Energy Detect Powerdown mode is enabled
+ */
+struct adin_priv {
+ bool edpd_enabled;
+};
+
static int adin_lookup_reg_value(const struct adin_cfg_reg_map *tbl, int cfg)
{
size_t i;
@@ -244,6 +257,18 @@ static int adin_config_rmii_mode(struct phy_device *phydev)
ADIN1300_GE_RMII_CFG_REG, reg);
}
+static int adin_config_init_edpd(struct phy_device *phydev)
+{
+ struct adin_priv *priv = phydev->priv;
+
+ if (priv->edpd_enabled)
+ return phy_set_bits(phydev, ADIN1300_PHY_CTRL_STATUS2,
+ (ADIN1300_NRG_PD_EN | ADIN1300_NRG_PD_TX_EN));
+
+ return phy_clear_bits(phydev, ADIN1300_PHY_CTRL_STATUS2,
+ (ADIN1300_NRG_PD_EN | ADIN1300_NRG_PD_TX_EN));
+}
+
static int adin_config_init(struct phy_device *phydev)
{
int rc;
@@ -262,6 +287,10 @@ static int adin_config_init(struct phy_device *phydev)
if (rc < 0)
return rc;
+ rc = adin_config_init_edpd(phydev);
+ if (rc < 0)
+ return rc;
+
phydev_dbg(phydev, "PHY is using mode '%s'\n",
phy_modes(phydev->interface));
@@ -481,6 +510,17 @@ static int adin_reset(struct phy_device *phydev)
static int adin_probe(struct phy_device *phydev)
{
+ struct device *dev = &phydev->mdio.dev;
+ struct adin_priv *priv;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->edpd_enabled =
+ device_property_read_bool(dev, "adi,disable-energy-detect");
+ phydev->priv = priv;
+
return adin_reset(phydev);
}
--
2.20.1
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