When prototyping a heterogenous machine including the ITU,
we get:

  include/hw/misc/mips_itu.h:76:5: error: unknown type name 'MIPSCPU'
      MIPSCPU *cpu0;
      ^

MIPSCPU is declared in the target specific "cpu.h" header,
but we don't want to include it, because "cpu.h" is target
specific and its inclusion taints all files including
"mips_itu.h", which become target specific too. We can
however use the 'ArchCPU *' type in the public header.
By keeping the TYPE_MIPS_CPU QOM type check in the link
property declaration, QOM core code will still check the
property is a correct MIPS CPU.

TYPE_MIPS_ITU is still built per-(MIPS)target, but its header
can now be included by other targets.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 include/hw/misc/mips_itu.h | 2 +-
 hw/misc/mips_itu.c         | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/hw/misc/mips_itu.h b/include/hw/misc/mips_itu.h
index a413789151..5caed6cc36 100644
--- a/include/hw/misc/mips_itu.h
+++ b/include/hw/misc/mips_itu.h
@@ -73,7 +73,7 @@ struct MIPSITUState {
 
     /* SAAR */
     uint64_t *saar;
-    MIPSCPU *cpu0;
+    ArchCPU *cpu0;
 };
 
 /* Get ITC Configuration Tag memory region. */
diff --git a/hw/misc/mips_itu.c b/hw/misc/mips_itu.c
index 0eda302db4..5a83ccc4e8 100644
--- a/hw/misc/mips_itu.c
+++ b/hw/misc/mips_itu.c
@@ -532,7 +532,7 @@ static void mips_itu_realize(DeviceState *dev, Error **errp)
         return;
     }
 
-    env = &s->cpu0->env;
+    env = &MIPS_CPU(s->cpu0)->env;
     if (env->saarp) {
         s->saar = env->CP0_SAAR;
     }
@@ -563,7 +563,7 @@ static Property mips_itu_properties[] = {
                       ITC_FIFO_NUM_MAX),
     DEFINE_PROP_UINT32("num-semaphores", MIPSITUState, num_semaphores,
                       ITC_SEMAPH_NUM_MAX),
-    DEFINE_PROP_LINK("cpu[0]", MIPSITUState, cpu0, TYPE_MIPS_CPU, MIPSCPU *),
+    DEFINE_PROP_LINK("cpu[0]", MIPSITUState, cpu0, TYPE_MIPS_CPU, ArchCPU *),
     DEFINE_PROP_END_OF_LIST(),
 };
 
-- 
2.41.0