uart node need interrupts and interrupt-parent cells.

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 hw/loongarch/virt.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index e2185d7bb4..5d92b2f1aa 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -209,7 +209,8 @@ static void fdt_add_rtc_node(LoongArchMachineState *lams)
     g_free(nodename);
 }
 
-static void fdt_add_uart_node(LoongArchMachineState *lams)
+static void fdt_add_uart_node(LoongArchMachineState *lams,
+                              uint32_t *pch_pic_phandle)
 {
     char *nodename;
     hwaddr base = VIRT_UART_BASE;
@@ -222,6 +223,10 @@ static void fdt_add_uart_node(LoongArchMachineState *lams)
     qemu_fdt_setprop_cells(ms->fdt, nodename, "reg", 0x0, base, 0x0, size);
     qemu_fdt_setprop_cell(ms->fdt, nodename, "clock-frequency", 100000000);
     qemu_fdt_setprop_string(ms->fdt, "/chosen", "stdout-path", nodename);
+    qemu_fdt_setprop_cells(ms->fdt, nodename, "interrupts",
+                           VIRT_UART_IRQ - VIRT_GSI_BASE, 0x4);
+    qemu_fdt_setprop_cell(ms->fdt, nodename, "interrupt-parent",
+                          *pch_pic_phandle);
     g_free(nodename);
 }
 
@@ -593,7 +598,7 @@ static void loongarch_devices_init(DeviceState *pch_pic,
                    qdev_get_gpio_in(pch_pic,
                                     VIRT_UART_IRQ - VIRT_GSI_BASE),
                    115200, serial_hd(0), DEVICE_LITTLE_ENDIAN);
-    fdt_add_uart_node(lams);
+    fdt_add_uart_node(lams, pch_pic_phandle);
 
     /* Network init */
     pci_init_nic_devices(pci_bus, mc->default_nic);
-- 
2.25.1