In preparation for splitting out the common bits from the HDMI
driver, change the mtk_cec driver from being registered from the
HDMI driver itself to be a module_platform_driver of its own.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_cec.c  | 5 ++++-
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 1 -
 drivers/gpu/drm/mediatek/mtk_hdmi.h | 1 -
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_cec.c b/drivers/gpu/drm/mediatek/mtk_cec.c
index 2de248443147..263ae3b4c4df 100644
--- a/drivers/gpu/drm/mediatek/mtk_cec.c
+++ b/drivers/gpu/drm/mediatek/mtk_cec.c
@@ -12,7 +12,6 @@
 #include <linux/platform_device.h>
 
 #include "mtk_cec.h"
-#include "mtk_hdmi.h"
 #include "mtk_drm_drv.h"
 
 #define TR_CONFIG		0x00
@@ -247,3 +246,7 @@ struct platform_driver mtk_cec_driver = {
 		.of_match_table = mtk_cec_of_ids,
 	},
 };
+module_platform_driver(mtk_cec_driver);
+
+MODULE_DESCRIPTION("MediaTek HDMI CEC Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 7687f673964e..73ab88015d7f 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1805,7 +1805,6 @@ static struct platform_driver mtk_hdmi_driver = {
 
 static struct platform_driver * const mtk_hdmi_drivers[] = {
 	&mtk_hdmi_ddc_driver,
-	&mtk_cec_driver,
 	&mtk_hdmi_driver,
 };
 
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.h b/drivers/gpu/drm/mediatek/mtk_hdmi.h
index 472bf141c92b..e40bc4651995 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.h
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.h
@@ -8,7 +8,6 @@
 
 struct platform_driver;
 
-extern struct platform_driver mtk_cec_driver;
 extern struct platform_driver mtk_hdmi_ddc_driver;
 
 #endif /* _MTK_HDMI_CTRL_H */
-- 
2.47.0

Hi AngeloGioacchino,

kernel test robot noticed the following build errors:

[auto build test ERROR on robh/for-next]
[also build test ERROR on pza/reset/next linus/master drm-misc/drm-misc-next v6.12 next-20241122]
[cannot apply to pza/imx-drm/next]
[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/AngeloGioacchino-Del-Regno/dt-bindings-display-mediatek-Add-binding-for-HDMIv2-DDC/20241121-132321
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20241120124512.134278-4-angelogioacchino.delregno%40collabora.com
patch subject: [PATCH v1 3/7] drm/mediatek: mtk_cec: Switch to register as module_platform_driver
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20241122/202411222245.WS9U5m9I-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241122/202411222245.WS9U5m9I-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/202411222245.WS9U5m9I-lkp@intel.com/

All errors (new ones prefixed by >>):

   aarch64-linux-ld: drivers/gpu/drm/mediatek/mtk_hdmi.o: in function `mtk_hdmitx_init':
>> drivers/gpu/drm/mediatek/mtk_hdmi.c:1812: multiple definition of `init_module'; drivers/gpu/drm/mediatek/mtk_cec.o:drivers/gpu/drm/mediatek/mtk_cec.c:249: first defined here
   aarch64-linux-ld: drivers/gpu/drm/mediatek/mtk_hdmi.o: in function `mtk_hdmitx_exit':
>> drivers/gpu/drm/mediatek/mtk_hdmi.c:1818: multiple definition of `cleanup_module'; drivers/gpu/drm/mediatek/mtk_cec.o:drivers/gpu/drm/mediatek/mtk_cec.c:249: first defined here


vim +1812 drivers/gpu/drm/mediatek/mtk_hdmi.c

8f83f26891e125 Jie Qiu       2016-01-04  1810  
8f83f26891e125 Jie Qiu       2016-01-04  1811  static int __init mtk_hdmitx_init(void)
8f83f26891e125 Jie Qiu       2016-01-04 @1812  {
446b8c542f8551 Philipp Zabel 2017-03-17  1813  	return platform_register_drivers(mtk_hdmi_drivers,
446b8c542f8551 Philipp Zabel 2017-03-17  1814  					 ARRAY_SIZE(mtk_hdmi_drivers));
8f83f26891e125 Jie Qiu       2016-01-04  1815  }
8f83f26891e125 Jie Qiu       2016-01-04  1816  
8f83f26891e125 Jie Qiu       2016-01-04  1817  static void __exit mtk_hdmitx_exit(void)
8f83f26891e125 Jie Qiu       2016-01-04 @1818  {
446b8c542f8551 Philipp Zabel 2017-03-17  1819  	platform_unregister_drivers(mtk_hdmi_drivers,
446b8c542f8551 Philipp Zabel 2017-03-17  1820  				    ARRAY_SIZE(mtk_hdmi_drivers));
8f83f26891e125 Jie Qiu       2016-01-04  1821  }
8f83f26891e125 Jie Qiu       2016-01-04  1822  

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