ASoC: codecs: rk3308: fix build warning without OF

Merge series from Luca Ceresoli <luca.ceresoli@bootlin.com>:

This small series fixes a build warning reported by kernel test robot
<lkp@intel.com> and improves the Kconfig entry.
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
Changes in v2:
- Replaced v1 implementation with __maybe_unused
- Added patch to depend on || COMPILE_TEST
- Link to v1: https://lore.kernel.org/r/20240329-rk3308-audio-codec-fix-warning-v1-1-b9d177fcd6c9@bootlin.com

---
Luca Ceresoli (2):
      ASoC: codecs: rk3308: fix "defined but not used" warning on !OF
      ASoC: codecs: rk3308: depend on ARM64 || COMPILE_TEST

 sound/soc/codecs/Kconfig        | 1 +
 sound/soc/codecs/rk3308_codec.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)
---
base-commit: 4ed0915f
change-id: 20240329-rk3308-audio-codec-fix-warning-51bb572ebd96

Best regards,
--
Luca Ceresoli <luca.ceresoli@bootlin.com>

sound/soc/codecs/Kconfig

@@ -1436,6 +1436,7 @@ config SND_SOC_PEB2466
 
 config SND_SOC_RK3308
 	tristate "Rockchip RK3308 audio CODEC"
+	depends on ARM64 || COMPILE_TEST
 	select REGMAP_MMIO
 	help
 	  This is a device driver for the audio codec embedded in the

sound/soc/codecs/rk3308_codec.c

@@ -953,7 +953,7 @@ static int rk3308_codec_platform_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct of_device_id rk3308_codec_of_match[] = {
+static const struct of_device_id __maybe_unused rk3308_codec_of_match[] = {
 	{ .compatible = "rockchip,rk3308-codec", },
 	{},
 };