clocksource: tegra: move to of_clk_get

The new clockframework introduced DT IDs for each clock. To be able to remove
the device registrations, this driver needs to be updated to use the DT IDs.
Note that the actual removal of the clk_register_clkdev() calls will be done
in a later series.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
diff --git a/drivers/clocksource/tegra20_timer.c b/drivers/clocksource/tegra20_timer.c
index 0bde03f..bc4b8ad 100644
--- a/drivers/clocksource/tegra20_timer.c
+++ b/drivers/clocksource/tegra20_timer.c
@@ -189,7 +189,7 @@
 		BUG();
 	}
 
-	clk = clk_get_sys("timer", NULL);
+	clk = of_clk_get(np, 0);
 	if (IS_ERR(clk)) {
 		pr_warn("Unable to get timer clock. Assuming 12Mhz input clock.\n");
 		rate = 12000000;
@@ -216,7 +216,7 @@
 	 * rtc registers are used by read_persistent_clock, keep the rtc clock
 	 * enabled
 	 */
-	clk = clk_get_sys("rtc-tegra", NULL);
+	clk = of_clk_get(np, 0);
 	if (IS_ERR(clk))
 		pr_warn("Unable to get rtc-tegra clock\n");
 	else