devicetree: get opp-v2 freq range for gpu, if available

* opp-v2 = operating-points-v2, frequency scaling information
  from device tree that can be used for cpu, gpu, etc.
* adds helper function to get the opp-v2 range of frequencies
  for a node, dtr_get_opp_range() in dt_util.c
* adds a freq range in opp-v2 property for a node in dt
* reports a gpu's max clock frequency if avaiable via opp-v2

Signed-off-by: Burt P <pburt0@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/hardinfo/gpu_util.c b/hardinfo/gpu_util.c
index 4347aad6..dee3c431 100644
--- a/hardinfo/gpu_util.c
+++ b/hardinfo/gpu_util.c
@@ -97,6 +97,7 @@ void gpud_free(gpud *s) {
         free(s->drm_dev);
         free(s->sysfs_drm_path);
         free(s->dt_compat);
+        free(s->dt_opp);
         pcid_free(s->pci_dev);
         nvgpu_free(s->nv_info);
         g_free(s);
@@ -301,6 +302,10 @@ gpud *dt_soc_gpu() {
     gpu->dt_status = dtr_get_string(tmp_path, 1);
     snprintf(tmp_path, 255, "%s/name", dt_gpu_path);
     gpu->dt_name = dtr_get_string(tmp_path, 1);
+    gpu->dt_opp = dtr_get_opp_range(dt, dt_gpu_path);
+    if (gpu->dt_opp) {
+        gpu->khz_max = gpu->dt_opp->khz_max;
+    }
     EMPIFNULL(gpu->dt_name);
     EMPIFNULL(gpu->dt_status);