Merge branch 'lan78xx-Read-configuration-from-Device-Tree'

Phil Elwell says:

====================
lan78xx: Read configuration from Device Tree

The Microchip LAN78XX family of devices are Ethernet controllers with
a USB interface. Despite being discoverable devices it can be useful to
be able to configure them from Device Tree, particularly in low-cost
applications without an EEPROM or programmed OTP.

This patch set adds support for reading the MAC address and LED modes from
Device Tree.

v4:
- Rename nodes in bindings doc.

v3:
- Move LED setting into PHY driver.

v2:
- Use eth_platform_get_mac_address.
- Support up to 4 LEDs, and move LED mode constants into dt-bindings header.
- Improve bindings document.
- Remove EEE support.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/net/phy/microchip.c b/drivers/net/phy/microchip.c
index 0f293ef28935..ef5e160fe9dc 100644
--- a/drivers/net/phy/microchip.c
+++ b/drivers/net/phy/microchip.c
@@ -20,6 +20,8 @@
 #include <linux/ethtool.h>
 #include <linux/phy.h>
 #include <linux/microchipphy.h>
+#include <linux/of.h>
+#include <dt-bindings/net/microchip-lan78xx.h>
 
 #define DRIVER_AUTHOR	"WOOJUNG HUH <woojung.huh@microchip.com>"
 #define DRIVER_DESC	"Microchip LAN88XX PHY driver"
@@ -70,6 +72,8 @@ static int lan88xx_probe(struct phy_device *phydev)
 {
 	struct device *dev = &phydev->mdio.dev;
 	struct lan88xx_priv *priv;
+	u32 led_modes[4];
+	int len;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
@@ -77,6 +81,27 @@ static int lan88xx_probe(struct phy_device *phydev)
 
 	priv->wolopts = 0;
 
+	len = of_property_read_variable_u32_array(dev->of_node,
+						  "microchip,led-modes",
+						  led_modes,
+						  0,
+						  ARRAY_SIZE(led_modes));
+	if (len >= 0) {
+		u32 reg = 0;
+		int i;
+
+		for (i = 0; i < len; i++) {
+			if (led_modes[i] > 15)
+				return -EINVAL;
+			reg |= led_modes[i] << (i * 4);
+		}
+		for (; i < ARRAY_SIZE(led_modes); i++)
+			reg |= LAN78XX_FORCE_LED_OFF << (i * 4);
+		(void)phy_write(phydev, LAN78XX_PHY_LED_MODE_SELECT, reg);
+	} else if (len == -EOVERFLOW) {
+		return -EINVAL;
+	}
+
 	/* these values can be used to identify internal PHY */
 	priv->chip_id = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_ID);
 	priv->chip_rev = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_REV);