--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -164,6 +164,12 @@ static void __init ath79_detect_sys_type
 		rev = id & AR934X_REV_ID_REVISION_MASK;
 		break;
 
+	case REV_ID_MAJOR_QCA9556:
+		ath79_soc = ATH79_SOC_QCA9556;
+		chip = "9556";
+		rev = id & AR944X_REV_ID_REVISION_MASK;
+		break;
+
 	case REV_ID_MAJOR_QCA9558:
 		ath79_soc = ATH79_SOC_QCA9558;
 		chip = "9558";
--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
@@ -460,6 +460,7 @@
 #define REV_ID_MAJOR_AR9341		0x0120
 #define REV_ID_MAJOR_AR9342		0x1120
 #define REV_ID_MAJOR_AR9344		0x2120
+#define REV_ID_MAJOR_QCA9556		0x0130
 #define REV_ID_MAJOR_QCA9558		0x1130
 
 #define AR71XX_REV_ID_MINOR_MASK	0x3
--- a/arch/mips/include/asm/mach-ath79/ath79.h
+++ b/arch/mips/include/asm/mach-ath79/ath79.h
@@ -32,6 +32,7 @@ enum ath79_soc_type {
 	ATH79_SOC_AR9341,
 	ATH79_SOC_AR9342,
 	ATH79_SOC_AR9344,
+	ATH79_SOC_QCA9556,
 	ATH79_SOC_QCA9558,
 };
 
@@ -99,6 +100,11 @@ static inline int soc_is_ar934x(void)
 	return soc_is_ar9341() || soc_is_ar9342() || soc_is_ar9344();
 }
 
+static inline int soc_is_qca9556(void)
+{
+	return ath79_soc == ATH79_SOC_QCA9556;
+}
+
 static inline int soc_is_qca9558(void)
 {
 	return ath79_soc == ATH79_SOC_QCA9558;
@@ -106,7 +112,7 @@ static inline int soc_is_qca9558(void)
 
 static inline int soc_is_qca955x(void)
 {
-	return soc_is_qca9558();
+	return soc_is_qca9556() || soc_is_qca9558();
 }
 
 extern void __iomem *ath79_ddr_base;