ASoC: tegra: mark runtime-pm functions as __maybe_unused

A reorganization of the driver source led to two of them causing
a compile time warning in some configurations:

tegra/tegra20_spdif.c:36:12: error: 'tegra20_spdif_runtime_resume' defined but not used [-Werror=unused-function]
   36 | static int tegra20_spdif_runtime_resume(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
tegra/tegra20_spdif.c:27:12: error: 'tegra20_spdif_runtime_suspend' defined but not used [-Werror=unused-function]
   27 | static int tegra20_spdif_runtime_suspend(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tegra/tegra30_ahub.c:64:12: error: 'tegra30_ahub_runtime_resume' defined but not used [-Werror=unused-function]
   64 | static int tegra30_ahub_runtime_resume(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
tegra/tegra30_ahub.c:43:12: error: 'tegra30_ahub_runtime_suspend' defined but not used [-Werror=unused-function]
   43 | static int tegra30_ahub_runtime_suspend(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Mark these functions as __maybe_unused to avoid this kind of warning.

Fixes: b5571449 ("ASoC: tegra30: ahub: Remove handing of disabled runtime PM")
Fixes: c53b396f ("ASoC: tegra20: spdif: Remove handing of disabled runtime PM")
Fixes: 80ec4a4c ("ASoC: tegra20: i2s: Remove handing of disabled runtime PM")
Fixes: b5f6f781 ("ASoC: tegra30: i2s: Remove handing of disabled runtime PM")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210422133418.1757893-1-arnd@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/tegra20_i2s.c

@@ -34,7 +34,7 @@
 
 #define DRV_NAME "tegra20-i2s"
 
-static int tegra20_i2s_runtime_suspend(struct device *dev)
+static __maybe_unused int tegra20_i2s_runtime_suspend(struct device *dev)
 {
 	struct tegra20_i2s *i2s = dev_get_drvdata(dev);
 
@@ -45,7 +45,7 @@ static int tegra20_i2s_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int tegra20_i2s_runtime_resume(struct device *dev)
+static __maybe_unused int tegra20_i2s_runtime_resume(struct device *dev)
 {
 	struct tegra20_i2s *i2s = dev_get_drvdata(dev);
 	int ret;

sound/soc/tegra/tegra20_spdif.c

@@ -24,7 +24,7 @@
 
 #define DRV_NAME "tegra20-spdif"
 
-static int tegra20_spdif_runtime_suspend(struct device *dev)
+static __maybe_unused int tegra20_spdif_runtime_suspend(struct device *dev)
 {
 	struct tegra20_spdif *spdif = dev_get_drvdata(dev);
 
@@ -33,7 +33,7 @@ static int tegra20_spdif_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int tegra20_spdif_runtime_resume(struct device *dev)
+static __maybe_unused int tegra20_spdif_runtime_resume(struct device *dev)
 {
 	struct tegra20_spdif *spdif = dev_get_drvdata(dev);
 	int ret;

sound/soc/tegra/tegra30_ahub.c

@@ -40,7 +40,7 @@ static inline void tegra30_audio_write(u32 reg, u32 val)
 	regmap_write(ahub->regmap_ahub, reg, val);
 }
 
-static int tegra30_ahub_runtime_suspend(struct device *dev)
+static __maybe_unused int tegra30_ahub_runtime_suspend(struct device *dev)
 {
 	regcache_cache_only(ahub->regmap_apbif, true);
 	regcache_cache_only(ahub->regmap_ahub, true);
@@ -61,7 +61,7 @@ static int tegra30_ahub_runtime_suspend(struct device *dev)
  * stopping streams should dynamically adjust the clock as required.  However,
  * this is not yet implemented.
  */
-static int tegra30_ahub_runtime_resume(struct device *dev)
+static __maybe_unused int tegra30_ahub_runtime_resume(struct device *dev)
 {
 	int ret;
 

sound/soc/tegra/tegra30_i2s.c

@@ -36,7 +36,7 @@
 
 #define DRV_NAME "tegra30-i2s"
 
-static int tegra30_i2s_runtime_suspend(struct device *dev)
+static __maybe_unused int tegra30_i2s_runtime_suspend(struct device *dev)
 {
 	struct tegra30_i2s *i2s = dev_get_drvdata(dev);
 
@@ -47,7 +47,7 @@ static int tegra30_i2s_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int tegra30_i2s_runtime_resume(struct device *dev)
+static __maybe_unused int tegra30_i2s_runtime_resume(struct device *dev)
 {
 	struct tegra30_i2s *i2s = dev_get_drvdata(dev);
 	int ret;