vas: Disable VAS/NX-842 on some P9 revisions

VAS/NX-842 are not functional on some P9 revisions, so disable them
in hardware and skip creating their device tree nodes.

Since the intent is to prevent OS from configuring VAS/NX, we remove
only the platform device nodes but leave the VAS/NX DT nodes under
xscom (i.e we don't skip add_vas_node() in hdata/spira.c)

Thanks to input from Michael Ellerman, Michael Neuling.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/hw/nx.c b/hw/nx.c
index 0f6ff04..7032c9f 100644
--- a/hw/nx.c
+++ b/hw/nx.c
@@ -24,6 +24,7 @@
 #include <chip.h>
 #include <xscom-p9-regs.h>
 #include <phys-map.h>
+#include <vas.h>
 #include <p9_stop_api.H>
 
 static void p9_darn_init(void)
@@ -110,7 +111,12 @@ void nx_p9_rng_late_init(void)
 static void nx_init_one(struct dt_node *node)
 {
 	nx_create_rng_node(node);
+
+	if (!vas_nx_enabled())
+		return;
+
 	nx_create_crypto_node(node);
+
 	nx_create_compress_node(node);
 }