Letting the compiler remove these functions when the kernel is built
without CONFIG_PM_SLEEP support is simpler and less heavier for builds
than the use of __maybe_unused attributes.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
---
 drivers/media/platform/st/stm32/stm32-dcmi.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/st/stm32/stm32-dcmi.c b/drivers/media/platform/st/stm32/stm32-dcmi.c
index 13762861b769..07b67eb5b9dd 100644
--- a/drivers/media/platform/st/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/st/stm32/stm32-dcmi.c
@@ -2092,7 +2092,7 @@ static void dcmi_remove(struct platform_device *pdev)
 	dma_release_channel(dcmi->dma_chan);
 }
 
-static __maybe_unused int dcmi_runtime_suspend(struct device *dev)
+static int dcmi_runtime_suspend(struct device *dev)
 {
 	struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
 
@@ -2101,7 +2101,7 @@ static __maybe_unused int dcmi_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static __maybe_unused int dcmi_runtime_resume(struct device *dev)
+static int dcmi_runtime_resume(struct device *dev)
 {
 	struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
 	int ret;
@@ -2113,7 +2113,7 @@ static __maybe_unused int dcmi_runtime_resume(struct device *dev)
 	return ret;
 }
 
-static __maybe_unused int dcmi_suspend(struct device *dev)
+static int dcmi_suspend(struct device *dev)
 {
 	/* disable clock */
 	pm_runtime_force_suspend(dev);
@@ -2124,7 +2124,7 @@ static __maybe_unused int dcmi_suspend(struct device *dev)
 	return 0;
 }
 
-static __maybe_unused int dcmi_resume(struct device *dev)
+static int dcmi_resume(struct device *dev)
 {
 	/* restore pinctl default state */
 	pinctrl_pm_select_default_state(dev);
@@ -2147,7 +2147,7 @@ static struct platform_driver stm32_dcmi_driver = {
 	.driver		= {
 		.name = DRV_NAME,
 		.of_match_table = of_match_ptr(stm32_dcmi_of_match),
-		.pm = &dcmi_pm_ops,
+		.pm = pm_sleep_ptr(&dcmi_pm_ops),
 	},
 };
 

-- 
2.34.1

Hi Alain,

kernel test robot noticed the following build warnings:

[auto build test WARNING on atorgue-stm32/stm32-next]
[also build test WARNING on robh/for-next linus/master v6.19-rc1 next-20251219]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Alain-Volmat/media-stm32-dcmi-Switch-from-__maybe_unused-to-pm_sleep_ptr/20251219-024836
base:   https://git.kernel.org/pub/scm/linux/kernel/git/atorgue/stm32.git stm32-next
patch link:    https://lore.kernel.org/r/20251218-stm32-dcmi-dma-chaining-v1-1-39948ca6cbf6%40foss.st.com
patch subject: [PATCH 01/12] media: stm32: dcmi: Switch from __maybe_unused to pm_sleep_ptr()
config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20251221/202512210044.xNNW6QJZ-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251221/202512210044.xNNW6QJZ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512210044.xNNW6QJZ-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/media/platform/st/stm32/stm32-dcmi.c:2127:12: warning: 'dcmi_resume' defined but not used [-Wunused-function]
    2127 | static int dcmi_resume(struct device *dev)
         |            ^~~~~~~~~~~
>> drivers/media/platform/st/stm32/stm32-dcmi.c:2116:12: warning: 'dcmi_suspend' defined but not used [-Wunused-function]
    2116 | static int dcmi_suspend(struct device *dev)
         |            ^~~~~~~~~~~~


vim +/dcmi_resume +2127 drivers/media/platform/st/stm32/stm32-dcmi.c

  2115	
> 2116	static int dcmi_suspend(struct device *dev)
  2117	{
  2118		/* disable clock */
  2119		pm_runtime_force_suspend(dev);
  2120	
  2121		/* change pinctrl state */
  2122		pinctrl_pm_select_sleep_state(dev);
  2123	
  2124		return 0;
  2125	}
  2126	
> 2127	static int dcmi_resume(struct device *dev)
  2128	{
  2129		/* restore pinctl default state */
  2130		pinctrl_pm_select_default_state(dev);
  2131	
  2132		/* clock enable */
  2133		pm_runtime_force_resume(dev);
  2134	
  2135		return 0;
  2136	}
  2137	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki