net: phy: micrel: add Microchip KSZ9131 initial driver

Add support for Microchip Technology KSZ9131 10/100/1000 Ethernet PHY
Signed-off-by: Yuiko Oshino <yuiko.oshino@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/micrel.c

@@ -14,7 +14,7 @@
  * option) any later version.
  *
  * Support : Micrel Phys:
- *		Giga phys: ksz9021, ksz9031
+ *		Giga phys: ksz9021, ksz9031, ksz9131
  *		100/10 Phys : ksz8001, ksz8721, ksz8737, ksz8041
  *			   ksz8021, ksz8031, ksz8051,
  *			   ksz8081, ksz8091,
@@ -609,6 +609,116 @@ static int ksz9031_config_init(struct phy_device *phydev)
 	return result;
 }
 
+#define KSZ9131_SKEW_5BIT_MAX	2400
+#define KSZ9131_SKEW_4BIT_MAX	800
+#define KSZ9131_OFFSET		700
+#define KSZ9131_STEP		100
+
+static int ksz9131_of_load_skew_values(struct phy_device *phydev,
+				       struct device_node *of_node,
+				       u16 reg, size_t field_sz,
+				       char *field[], u8 numfields)
+{
+	int val[4] = {-(1 + KSZ9131_OFFSET), -(2 + KSZ9131_OFFSET),
+		      -(3 + KSZ9131_OFFSET), -(4 + KSZ9131_OFFSET)};
+	int skewval, skewmax = 0;
+	int matches = 0;
+	u16 maxval;
+	u16 newval;
+	u16 mask;
+	int i;
+
+	/* psec properties in dts should mean x pico seconds */
+	if (field_sz == 5)
+		skewmax = KSZ9131_SKEW_5BIT_MAX;
+	else
+		skewmax = KSZ9131_SKEW_4BIT_MAX;
+
+	for (i = 0; i < numfields; i++)
+		if (!of_property_read_s32(of_node, field[i], &skewval)) {
+			if (skewval < -KSZ9131_OFFSET)
+				skewval = -KSZ9131_OFFSET;
+			else if (skewval > skewmax)
+				skewval = skewmax;
+
+			val[i] = skewval + KSZ9131_OFFSET;
+			matches++;
+		}
+
+	if (!matches)
+		return 0;
+
+	if (matches < numfields)
+		newval = ksz9031_extended_read(phydev, OP_DATA, 2, reg);
+	else
+		newval = 0;
+
+	maxval = (field_sz == 4) ? 0xf : 0x1f;
+	for (i = 0; i < numfields; i++)
+		if (val[i] != -(i + 1 + KSZ9131_OFFSET)) {
+			mask = 0xffff;
+			mask ^= maxval << (field_sz * i);
+			newval = (newval & mask) |
+				(((val[i] / KSZ9131_STEP) & maxval)
+					<< (field_sz * i));
+		}
+
+	return ksz9031_extended_write(phydev, OP_DATA, 2, reg, newval);
+}
+
+static int ksz9131_config_init(struct phy_device *phydev)
+{
+	const struct device *dev = &phydev->mdio.dev;
+	struct device_node *of_node = dev->of_node;
+	char *clk_skews[2] = {"rxc-skew-psec", "txc-skew-psec"};
+	char *rx_data_skews[4] = {
+		"rxd0-skew-psec", "rxd1-skew-psec",
+		"rxd2-skew-psec", "rxd3-skew-psec"
+	};
+	char *tx_data_skews[4] = {
+		"txd0-skew-psec", "txd1-skew-psec",
+		"txd2-skew-psec", "txd3-skew-psec"
+	};
+	char *control_skews[2] = {"txen-skew-psec", "rxdv-skew-psec"};
+	const struct device *dev_walker;
+	int ret;
+
+	dev_walker = &phydev->mdio.dev;
+	do {
+		of_node = dev_walker->of_node;
+		dev_walker = dev_walker->parent;
+	} while (!of_node && dev_walker);
+
+	if (!of_node)
+		return 0;
+
+	ret = ksz9131_of_load_skew_values(phydev, of_node,
+					  MII_KSZ9031RN_CLK_PAD_SKEW, 5,
+					  clk_skews, 2);
+	if (ret < 0)
+		return ret;
+
+	ret = ksz9131_of_load_skew_values(phydev, of_node,
+					  MII_KSZ9031RN_CONTROL_PAD_SKEW, 4,
+					  control_skews, 2);
+	if (ret < 0)
+		return ret;
+
+	ret = ksz9131_of_load_skew_values(phydev, of_node,
+					  MII_KSZ9031RN_RX_DATA_PAD_SKEW, 4,
+					  rx_data_skews, 4);
+	if (ret < 0)
+		return ret;
+
+	ret = ksz9131_of_load_skew_values(phydev, of_node,
+					  MII_KSZ9031RN_TX_DATA_PAD_SKEW, 4,
+					  tx_data_skews, 4);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
 #define KSZ8873MLL_GLOBAL_CONTROL_4	0x06
 #define KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX	BIT(6)
 #define KSZ8873MLL_GLOBAL_CONTROL_4_SPEED	BIT(4)
@@ -974,6 +1084,23 @@ static struct phy_driver ksphy_driver[] = {
 	.get_stats	= kszphy_get_stats,
 	.suspend	= genphy_suspend,
 	.resume		= kszphy_resume,
+}, {
+	.phy_id		= PHY_ID_KSZ9131,
+	.phy_id_mask	= MICREL_PHY_ID_MASK,
+	.name		= "Microchip KSZ9131 Gigabit PHY",
+	.features	= PHY_GBIT_FEATURES,
+	.flags		= PHY_HAS_INTERRUPT,
+	.driver_data	= &ksz9021_type,
+	.probe		= kszphy_probe,
+	.config_init	= ksz9131_config_init,
+	.read_status	= ksz9031_read_status,
+	.ack_interrupt	= kszphy_ack_interrupt,
+	.config_intr	= kszphy_config_intr,
+	.get_sset_count = kszphy_get_sset_count,
+	.get_strings	= kszphy_get_strings,
+	.get_stats	= kszphy_get_stats,
+	.suspend	= genphy_suspend,
+	.resume		= kszphy_resume,
 }, {
 	.phy_id		= PHY_ID_KSZ8873MLL,
 	.phy_id_mask	= MICREL_PHY_ID_MASK,
@@ -1022,6 +1149,7 @@ MODULE_LICENSE("GPL");
 static struct mdio_device_id __maybe_unused micrel_tbl[] = {
 	{ PHY_ID_KSZ9021, 0x000ffffe },
 	{ PHY_ID_KSZ9031, MICREL_PHY_ID_MASK },
+	{ PHY_ID_KSZ9131, MICREL_PHY_ID_MASK },
 	{ PHY_ID_KSZ8001, 0x00fffffc },
 	{ PHY_ID_KS8737, MICREL_PHY_ID_MASK },
 	{ PHY_ID_KSZ8021, 0x00ffffff },

include/linux/micrel_phy.h

@@ -31,6 +31,7 @@
 #define PHY_ID_KSZ8081		0x00221560
 #define PHY_ID_KSZ8061		0x00221570
 #define PHY_ID_KSZ9031		0x00221620
+#define PHY_ID_KSZ9131		0x00221640
 
 #define PHY_ID_KSZ886X		0x00221430
 #define PHY_ID_KSZ8863		0x00221435