v4.19.13 snapshot.
diff --git a/drivers/clocksource/timer-probe.c b/drivers/clocksource/timer-probe.c
new file mode 100644
index 0000000..0280757
--- /dev/null
+++ b/drivers/clocksource/timer-probe.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/clocksource.h>
+
+extern struct of_device_id __timer_of_table[];
+
+static const struct of_device_id __timer_of_table_sentinel
+ __used __section(__timer_of_table_end);
+
+void __init timer_probe(void)
+{
+ struct device_node *np;
+ const struct of_device_id *match;
+ of_init_fn_1_ret init_func_ret;
+ unsigned timers = 0;
+ int ret;
+
+ for_each_matching_node_and_match(np, __timer_of_table, &match) {
+ if (!of_device_is_available(np))
+ continue;
+
+ init_func_ret = match->data;
+
+ ret = init_func_ret(np);
+ if (ret) {
+ pr_err("Failed to initialize '%pOF': %d\n", np, ret);
+ continue;
+ }
+
+ timers++;
+ }
+
+ timers += acpi_probe_device_table(timer);
+
+ if (!timers)
+ pr_crit("%s: no matching timers found\n", __func__);
+}