MIPS: ath79: add SoC detection code for the QCA955X SoCs

Also add 'soc_is_qca955[68x]' helper functions
and a Kconfig symbol for the SoC family.

Cc: Rodriguez, Luis <rodrigue@qca.qualcomm.com>
Cc: Giori, Kathy <kgiori@qca.qualcomm.com>
Cc: QCA Linux Team <qca-linux-team@qca.qualcomm.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4943/
Signed-off-by: John Crispin <blogic@openwrt.org>
diff --git a/arch/mips/ath79/Kconfig b/arch/mips/ath79/Kconfig
index f44feee..cffdc8e 100644
--- a/arch/mips/ath79/Kconfig
+++ b/arch/mips/ath79/Kconfig
@@ -88,6 +88,10 @@
 	select PCI_AR724X if PCI
 	def_bool n
 
+config SOC_QCA955X
+	select USB_ARCH_HAS_EHCI
+	def_bool n
+
 config PCI_AR724X
 	def_bool n
 
diff --git a/arch/mips/ath79/setup.c b/arch/mips/ath79/setup.c
index 60d212e..d5b3c90 100644
--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -164,13 +164,29 @@
 		rev = id & AR934X_REV_ID_REVISION_MASK;
 		break;
 
+	case REV_ID_MAJOR_QCA9556:
+		ath79_soc = ATH79_SOC_QCA9556;
+		chip = "9556";
+		rev = id & QCA955X_REV_ID_REVISION_MASK;
+		break;
+
+	case REV_ID_MAJOR_QCA9558:
+		ath79_soc = ATH79_SOC_QCA9558;
+		chip = "9558";
+		rev = id & QCA955X_REV_ID_REVISION_MASK;
+		break;
+
 	default:
 		panic("ath79: unknown SoC, id:0x%08x", id);
 	}
 
 	ath79_soc_rev = rev;
 
-	sprintf(ath79_sys_type, "Atheros AR%s rev %u", chip, rev);
+	if (soc_is_qca955x())
+		sprintf(ath79_sys_type, "Qualcomm Atheros QCA%s rev %u",
+			chip, rev);
+	else
+		sprintf(ath79_sys_type, "Atheros AR%s rev %u", chip, rev);
 	pr_info("SoC: %s\n", ath79_sys_type);
 }