Determine the IRQ number in the same way as for pnv_dt_ipmi_bt(). This
resolves one usage of ISADevice::isairq[] which allows it to be removed
eventually.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/ppc/pnv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 837146a2fb..441bf958ca 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -380,9 +380,12 @@ static void pnv_dt_serial(ISADevice *d, void *fdt, int lpc_off)
         cpu_to_be32(io_base),
         cpu_to_be32(8)
     };
+    uint32_t irq;
     char *name;
     int node;
 
+    irq = object_property_get_uint(OBJECT(d), "irq", &error_fatal);
+
     name = g_strdup_printf("%s@i%x", qdev_fw_name(DEVICE(d)), io_base);
     node = fdt_add_subnode(fdt, lpc_off, name);
     _FDT(node);
@@ -394,7 +397,7 @@ static void pnv_dt_serial(ISADevice *d, void *fdt, int lpc_off)
 
     _FDT((fdt_setprop_cell(fdt, node, "clock-frequency", 1843200)));
     _FDT((fdt_setprop_cell(fdt, node, "current-speed", 115200)));
-    _FDT((fdt_setprop_cell(fdt, node, "interrupts", d->isairq[0])));
+    _FDT((fdt_setprop_cell(fdt, node, "interrupts", irq)));
     _FDT((fdt_setprop_cell(fdt, node, "interrupt-parent",
                            fdt_get_phandle(fdt, lpc_off))));
 
-- 
2.35.1