# \[PATCH v2 2/5\] clk: Enable/Disable runtime PM for clk\_summary

- From: Taniya Das \<hidden\>
- Date: 2021-12-20 16:44:28 
- List: linux-devicetree
- Page: https://ratatoskr.run/linux-devicetree/2021/12/1614623
- Thread: https://ratatoskr.run/linux-arm-msm/2021/12/1614621/t.md

```text
The registers for some clocks in the SOC area, which are under the power
domain are required to be enabled before accessing them. During the
clk_summary if the power-domains are not enabled they could result into
NoC errors.

Thus ensure the register access of the clock controller is done with
pm_untime_get/put functions.

Signed-off-by: Taniya Das <redacted>
---
 drivers/clk/clk.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 963f56f..8de6a22 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2966,7 +2966,9 @@ static void clk_summary_show_subtree(struct seq_file *s, struct clk_core *c,
 {
 	struct clk_core *child;

+	clk_pm_runtime_get(c);
 	clk_summary_show_one(s, c, level);
+	clk_pm_runtime_put(c);

 	hlist_for_each_entry(child, &c->children, child_node)
 		clk_summary_show_subtree(s, child, level + 1);
--
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of the Code Aurora Forum, hosted by the  Linux Foundation.

```