[PATCH] mailbox: imx: Mark PM functions as __maybe_unused

[Nathan Chancellor]

When CONFIG_PM and CONFIG_PM_SLEEP are unset, the following warnings
occur:

drivers/mailbox/imx-mailbox.c:638:12: warning: 'imx_mu_runtime_resume'
defined but not used [-Wunused-function]
  638 | static int imx_mu_runtime_resume(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~~~
drivers/mailbox/imx-mailbox.c:629:12: warning: 'imx_mu_runtime_suspend'
defined but not used [-Wunused-function]
  629 | static int imx_mu_runtime_suspend(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~~~~
drivers/mailbox/imx-mailbox.c:611:12: warning: 'imx_mu_resume_noirq'
defined but not used [-Wunused-function]
  611 | static int imx_mu_resume_noirq(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~
drivers/mailbox/imx-mailbox.c:601:12: warning: 'imx_mu_suspend_noirq'
defined but not used [-Wunused-function]
  601 | static int imx_mu_suspend_noirq(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~~

Mark these functions as __maybe_unused, which is the standard procedure
for PM functions.

Fixes: bb2b2624dbe2 ("mailbox: imx: Add runtime PM callback to handle MU clocks")
Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
---
 drivers/mailbox/imx-mailbox.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
index 7205b825c8b5..2543c7b6948b 100644
--- a/drivers/mailbox/imx-mailbox.c
+++ b/drivers/mailbox/imx-mailbox.c
@@ -598,7 +598,7 @@ static const struct of_device_id imx_mu_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, imx_mu_dt_ids);
 
-static int imx_mu_suspend_noirq(struct device *dev)
+static int __maybe_unused imx_mu_suspend_noirq(struct device *dev)
 {
 	struct imx_mu_priv *priv = dev_get_drvdata(dev);
 
@@ -608,7 +608,7 @@ static int imx_mu_suspend_noirq(struct device *dev)
 	return 0;
 }
 
-static int imx_mu_resume_noirq(struct device *dev)
+static int __maybe_unused imx_mu_resume_noirq(struct device *dev)
 {
 	struct imx_mu_priv *priv = dev_get_drvdata(dev);
 
@@ -626,7 +626,7 @@ static int imx_mu_resume_noirq(struct device *dev)
 	return 0;
 }
 
-static int imx_mu_runtime_suspend(struct device *dev)
+static int __maybe_unused imx_mu_runtime_suspend(struct device *dev)
 {
 	struct imx_mu_priv *priv = dev_get_drvdata(dev);
 
@@ -635,7 +635,7 @@ static int imx_mu_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int imx_mu_runtime_resume(struct device *dev)
+static int __maybe_unused imx_mu_runtime_resume(struct device *dev)
 {
 	struct imx_mu_priv *priv = dev_get_drvdata(dev);
 	int ret;

base-commit: 27f11fea33608cbd321a97cbecfa2ef97dcc1821
-- 
2.27.0