+static int timer_pre_probe(struct udevice *dev)
+{
+ struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+ uc_priv->clock_rate = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+ "clock-frequency", 0);
+
+ return 0;
+}
+
+static int timer_post_probe(struct udevice *dev)
+{
+ struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+ if (!uc_priv->clock_rate)
+ return -EINVAL;
+
+ return 0;
+}
+
+u64 timer_conv_64(u32 count)
+{
+ /* increment tbh if tbl has rolled over */
+ if (count < gd->timebase_l)
+ gd->timebase_h++;
+ gd->timebase_l = count;
+ return ((u64)gd->timebase_h << 32) | gd->timebase_l;
+}
+
+int notrace dm_timer_init(void)
+{
+ const void *blob = gd->fdt_blob;
+ struct udevice *dev = NULL;
+ int node;
+ int ret;
+
+ if (gd->timer)
+ return 0;
+
+ /* Check for a chosen timer to be used for tick */
+ node = fdtdec_get_chosen_node(blob, "tick-timer");
+ if (node < 0) {
+ /* No chosen timer, trying first available timer */
+ ret = uclass_first_device_err(UCLASS_TIMER, &dev);
+ if (ret)
+ return ret;
+ } else {
+ if (uclass_get_device_by_of_offset(UCLASS_TIMER, node, &dev)) {
+ /*
+ * If the timer is not marked to be bound before
+ * relocation, bind it anyway.
+ */
+ if (node > 0 &&
+ !lists_bind_fdt(gd->dm_root, blob, node, &dev)) {
+ ret = device_probe(dev);
+ if (ret)
+ return ret;
+ }
+ }
+ }
+
+ if (dev) {
+ gd->timer = dev;
+ return 0;
+ }
+
+ return -ENODEV;
+}
+