r8168: add LED configuration from OF

This adds the ability to configure the LED configuration register using
OF. This way, the correct value for board specific LED configuration can
be determined.

Signed-off-by: AmadeusGhost <amadeus@jmu.edu.cn>
Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>

package/kernel/r8168/patches/001-r8168-add-LED-configuration-from-OF.patch

@@ -0,0 +1,42 @@
+--- a/src/r8168_n.c
++++ b/src/r8168_n.c
+@@ -46,6 +46,7 @@
+ #include <linux/etherdevice.h>
+ #include <linux/delay.h>
+ #include <linux/mii.h>
++#include <linux/of.h>
+ #include <linux/if_vlan.h>
+ #include <linux/crc32.h>
+ #include <linux/interrupt.h>
+@@ -23978,6 +23979,22 @@ rtl8168_set_bios_setting(struct net_device *dev)
+         }
+ }
+ 
++static int rtl8168_led_configuration(struct rtl8168_private *tp)
++{
++        u32 led_data;
++        int ret;
++
++        ret = of_property_read_u32(tp->pci_dev->dev.of_node,
++                                  "realtek,led-data", &led_data);
++
++        if (ret)
++                return ret;
++
++        RTL_W16(tp, CustomLED, led_data);
++
++        return 0;
++}
++
+ static void
+ rtl8168_init_software_variable(struct net_device *dev)
+ {
+@@ -24441,6 +24458,8 @@ rtl8168_init_software_variable(struct net_device *dev)
+                 tp->NotWrMcuPatchCode = TRUE;
+         }
+ 
++        rtl8168_led_configuration(tp);
++
+         tp->NicCustLedValue = RTL_R16(tp, CustomLED);
+ 
+         rtl8168_get_hw_wol(dev);