pmgr: Add a helper to test for pmgr features in the ADT

Signed-off-by: Hector Martin <marcan@marcan.st>

src/cpufreq.c

@@ -4,6 +4,7 @@
 #include "adt.h"
 #include "firmware.h"
 #include "soc.h"
+#include "pmgr.h"
 #include "utils.h"
 
 #define CLUSTER_PSTATE 0x20020

src/pmgr.c

@@ -394,3 +394,17 @@ int pmgr_init(void)
 
     return 0;
 }
+
+u32 pmgr_get_feature(const char *name)
+{
+    u32 val = 0;
+
+    int node = adt_path_offset(adt, "/arm-io/pmgr");
+    if (node < 0)
+        return 0;
+
+    if (ADT_GETPROP(adt, node, name, &val) < 0)
+        return 0;
+
+    return val;
+}

src/pmgr.h

@@ -23,4 +23,6 @@ int pmgr_adt_reset(const char *path);
 
 int pmgr_reset(int die, const char *name);
 
+u32 pmgr_get_feature(const char *name);
+
 #endif