usb-uart: fix compiler warning

arch/arm/mach-rockchip/rk3036.c: In function 'usb_uart_init':
arch/arm/mach-rockchip/rk3036.c:87:9: warning: unused variable

diff --git a/arch/arm/mach-rockchip/rk3036.c b/arch/arm/mach-rockchip/rk3036.c
index 65a3d8d552b160a9913f94e333128618dfcd5ac1..72317f89e002dc2c615cc5109e965eaf4e2c4ee1 100755 (executable)
--- a/arch/arm/mach-rockchip/rk3036.c
+++ b/arch/arm/mach-rockchip/rk3036.c
@@ -84,7 +84,9 @@ static void __init rk3036_boot_mode_init(void)
 
 static void usb_uart_init(void)
 {
+#ifdef CONFIG_RK_USB_UART
     u32 soc_status0 = readl_relaxed(RK_GRF_VIRT + RK3036_GRF_SOC_STATUS0);
+#endif
     writel_relaxed(0x34000000, RK_GRF_VIRT + RK3036_GRF_UOC1_CON4);
 #ifdef CONFIG_RK_USB_UART
     if (!(soc_status0 & (1 << 14)) && (soc_status0 & (1 << 17))) {