lantiq: kernel 4.14: autoselect matching vr9 rev firmware

Add a custom xrx200 ethernet phy compatible to load the firmware matching
the vr9 revision without specifing an expected revision.

We have quite a few boards in the tree were later produced ones are using
a more recent vr9. It is impossible to distinguish which revision of the
vr9 is used without opening the case and removing a heatsink for some of
them.

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/lantiq/patches-4.14/0024-MIPS-lantiq-autoselect-soc-rev-matching-fw.patch

+From ae0c287060749dc72c866484d12bd3cade8c517d Mon Sep 17 00:00:00 2001
+From: Mathias Kresin <dev@kresin.me>
+Date: Fri, 19 Jan 2018 20:19:06 +0100
+Subject: [PATCH] MIPS: lantiq: autoselect matching vr9 rev gphy firmware
+
+Add a custom xrx200 ethernet phy compatible to load the firmware matching
+the vr9 revision without specifing an expected revision.
+
+We have quite a few boards in the tree were later produced ones are using
+a more recent vr9. It is impossible to distinguish which revision of the
+vr9 is used without opening the case and removing a heatsink for some of
+them.
+
+Signed-off-by: Mathias Kresin <dev@kresin.me>
+---
+ drivers/soc/lantiq/gphy.c | 11 +++++++++++
+ 1 file changed, 11 insertions(+)
+
+--- a/drivers/soc/lantiq/gphy.c
++++ b/drivers/soc/lantiq/gphy.c
+@@ -56,6 +56,7 @@ static const struct xway_gphy_match_data
+ };
+ 
+ static const struct of_device_id xway_gphy_match[] = {
++	{ .compatible = "lantiq,xrx200-gphy", .data = NULL },
+ 	{ .compatible = "lantiq,xrx200a1x-gphy", .data = &xrx200a1x_gphy_data },
+ 	{ .compatible = "lantiq,xrx200a2x-gphy", .data = &xrx200a2x_gphy_data },
+ 	{ .compatible = "lantiq,xrx300-gphy", .data = &xrx300_gphy_data },
+@@ -130,6 +131,16 @@ static int xway_gphy_of_probe(struct pla
+ 
+ 	gphy_fw_name_cfg = of_device_get_match_data(dev);
+ 
++	if (of_device_is_compatible(pdev->dev.of_node, "lantiq,xrx200-gphy"))
++		switch (ltq_soc_type()) {
++		case SOC_TYPE_VR9:
++			gphy_fw_name_cfg = &xrx200a1x_gphy_data;
++			break;
++		case SOC_TYPE_VR9_2:
++			gphy_fw_name_cfg = &xrx200a2x_gphy_data;
++			break;
++		}
++
+ 	priv->gphy_clk_gate = devm_clk_get(dev, NULL);
+ 	if (IS_ERR(priv->gphy_clk_gate)) {
+ 		dev_err(dev, "Failed to lookup gate clock\n");