bus: brcmstb_gisb: update to support new revision

The 7278 introduces a new version of this core.  This
commit adds support for that revision.
Signed-off-by: Doug Berger <opendmb@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Documentation/devicetree/bindings/bus/brcm,gisb-arb.txt

@@ -3,7 +3,8 @@ Broadcom GISB bus Arbiter controller
 Required properties:
 
 - compatible:
-    "brcm,gisb-arb" or "brcm,bcm7445-gisb-arb" for 28nm chips
+    "brcm,bcm7278-gisb-arb" for V7 28nm chips
+    "brcm,gisb-arb" or "brcm,bcm7445-gisb-arb" for other 28nm chips
     "brcm,bcm7435-gisb-arb" for newer 40nm chips
     "brcm,bcm7400-gisb-arb" for older 40nm chips and all 65nm chips
     "brcm,bcm7038-gisb-arb" for 130nm chips

drivers/bus/brcmstb_gisb.c

@@ -56,6 +56,15 @@ static const int gisb_offsets_bcm7038[] = {
 	[ARB_ERR_CAP_MASTER]	= -1,
 };
 
+static const int gisb_offsets_bcm7278[] = {
+	[ARB_TIMER]		= 0x008,
+	[ARB_ERR_CAP_CLR]	= 0x7f8,
+	[ARB_ERR_CAP_HI_ADDR]	= -1,
+	[ARB_ERR_CAP_ADDR]	= 0x7e0,
+	[ARB_ERR_CAP_STATUS]	= 0x7f0,
+	[ARB_ERR_CAP_MASTER]	= 0x7f4,
+};
+
 static const int gisb_offsets_bcm7400[] = {
 	[ARB_TIMER]		= 0x00c,
 	[ARB_ERR_CAP_CLR]	= 0x0c8,
@@ -307,6 +316,7 @@ static const struct of_device_id brcmstb_gisb_arb_of_match[] = {
 	{ .compatible = "brcm,bcm7445-gisb-arb", .data = gisb_offsets_bcm7445 },
 	{ .compatible = "brcm,bcm7435-gisb-arb", .data = gisb_offsets_bcm7435 },
 	{ .compatible = "brcm,bcm7400-gisb-arb", .data = gisb_offsets_bcm7400 },
+	{ .compatible = "brcm,bcm7278-gisb-arb", .data = gisb_offsets_bcm7278 },
 	{ .compatible = "brcm,bcm7038-gisb-arb", .data = gisb_offsets_bcm7038 },
 	{ },
 };