layerscape: add support for fixed-link on RGMII interfaces

This is required on the Traverse LS1043 boards to support SFP
and xDSL plug-ins.

This will not be needed on kernel 4.14.

Signed-off-by: Mathew McBride <matt@traverse.com.au>

target/linux/layerscape/patches-4.9/820-rgmii-fixed-link.patch

@@ -0,0 +1,62 @@
+From f27ef8941ca29b2d10428754be51e8ee06bb1263 Mon Sep 17 00:00:00 2001
+From: Mathew McBride <matt@traverse.com.au>
+Date: Mon, 7 Aug 2017 10:19:48 +1000
+Subject: [PATCH] Recognize when an RGMII Link is set as fixed (in the device
+ tree) and set up the MAC accordingly
+
+---
+ drivers/net/ethernet/freescale/sdk_dpaa/mac.c               |  1 +
+ .../ethernet/freescale/sdk_fman/Peripherals/FM/MAC/memac.c  | 13 +++++++++++++
+ 2 files changed, 14 insertions(+)
+
+--- a/drivers/net/ethernet/freescale/sdk_dpaa/mac.c
++++ b/drivers/net/ethernet/freescale/sdk_dpaa/mac.c
+@@ -386,6 +386,7 @@ static int __cold mac_probe(struct platf
+ 		mac_dev->fixed_link->duplex = phy->duplex;
+ 		mac_dev->fixed_link->pause = phy->pause;
+ 		mac_dev->fixed_link->asym_pause = phy->asym_pause;
++		printk(KERN_INFO "Setting up fixed link, speed %d duplex %d\n", mac_dev->fixed_link->speed, mac_dev->fixed_link->duplex);
+ 	}
+ 
+ 	_errno = mac_dev->init(mac_dev);
+--- a/drivers/net/ethernet/freescale/sdk_fman/Peripherals/FM/MAC/memac.c
++++ b/drivers/net/ethernet/freescale/sdk_fman/Peripherals/FM/MAC/memac.c
+@@ -36,6 +36,8 @@
+ 
+  @Description   FM mEMAC driver
+ *//***************************************************************************/
++#include <../../../../sdk_dpaa/mac.h>
++#include <linux/phy_fixed.h>
+ 
+ #include "std_ext.h"
+ #include "string_ext.h"
+@@ -48,6 +50,8 @@
+ #include "memac.h"
+ 
+ 
++static t_Error MemacAdjustLink(t_Handle h_Memac, e_EnetSpeed speed, bool fullDuplex);
++
+ /*****************************************************************************/
+ /*                      Internal routines                                    */
+ /*****************************************************************************/
+@@ -276,11 +280,20 @@ static t_Error MemacEnable(t_Handle h_Me
+ {
+     t_Memac     *p_Memac = (t_Memac *)h_Memac;
+ 
++	struct mac_device *mac_dev = (struct mac_device *)p_Memac->h_App;
++
+     SANITY_CHECK_RETURN_ERROR(p_Memac, E_INVALID_HANDLE);
+     SANITY_CHECK_RETURN_ERROR(!p_Memac->p_MemacDriverParam, E_INVALID_STATE);
+ 
+     fman_memac_enable(p_Memac->p_MemMap, (mode & e_COMM_MODE_RX), (mode & e_COMM_MODE_TX));
+ 
++	if (ENET_INTERFACE_FROM_MODE(p_Memac->enetMode) == e_ENET_IF_RGMII) {
++		if (mac_dev->fixed_link) {
++			printk("This is a fixed-link, forcing speed %d duplex %d\n",mac_dev->fixed_link->speed,mac_dev->fixed_link->duplex);
++			MemacAdjustLink(h_Memac,mac_dev->fixed_link->speed,mac_dev->fixed_link->duplex);
++		}
++	}
++
+     return E_OK;
+ }
+