smsc95xx: configure LED outputs

SMSC LAN9500 has dual purpose GPIO/LED pins, and by default at power-on
these are configured as GPIOs. This means that if LEDs are fitted they
won't ever light.

This patch sets them to be LED outputs for speed, duplex and
link/activity.

Signed-off-by: Steve Glendinning <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/usb/smsc95xx.c

···
 	if (netif_msg_ifup(dev))
 		devdbg(dev, "ID_REV = 0x%08x", read_buf);
 
+	/* Configure GPIO pins as LED outputs */
+	write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
+		LED_GPIO_CFG_FDX_LED;
+	ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
+	if (ret < 0) {
+		devwarn(dev, "Failed to write LED_GPIO_CFG register, ret=%d",
+			ret);
+		return ret;
+	}
+
 	/* Init Tx */
 	write_buf = 0;
 	ret = smsc95xx_write_reg(dev, FLOW, write_buf);

drivers/net/usb/smsc95xx.h

···
 #define PM_CTL_WUPS_MULTI_		(0x00000003)
 
 #define LED_GPIO_CFG			(0x24)
+#define LED_GPIO_CFG_SPD_LED		(0x01000000)
+#define LED_GPIO_CFG_LNK_LED		(0x00100000)
+#define LED_GPIO_CFG_FDX_LED		(0x00010000)
 
 #define GPIO_CFG			(0x28)