[PATCH 2/3] backlight: dwi_bl: Add Apple DWI backlight driver

[kernel test robot]

Hi Nick,

kernel test robot noticed the following build errors:

[auto build test ERROR on 40384c840ea1944d7c5a392e8975ed088ecf0b37]

url:    https://github.com/intel-lab-lkp/linux/commits/Nick-Chan/dt-bindings-leds-backlight-apple-dwi-bl-Add-bindings-for-Apple-DWI-backlight/20241207-013254
base:   40384c840ea1944d7c5a392e8975ed088ecf0b37
patch link:    https://lore.kernel.org/r/20241206172735.4310-3-towinchenmi%40gmail.com
patch subject: [PATCH 2/3] backlight: dwi_bl: Add Apple DWI backlight driver
config: arc-randconfig-001-20241207 (https://download.01.org/0day-ci/archive/20241207/202412070721.9tZI9Ogl-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241207/202412070721.9tZI9Ogl-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412070721.9tZI9Ogl-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/video/backlight/dwi_bl.c: In function 'dwi_bl_update_status':
>> drivers/video/backlight/dwi_bl.c:46:16: error: implicit declaration of function 'FIELD_PREP' [-Werror=implicit-function-declaration]
      46 |         cmd |= FIELD_PREP(DWI_BL_CMD_DATA, brightness);
         |                ^~~~~~~~~~
   drivers/video/backlight/dwi_bl.c: In function 'dwi_bl_get_brightness':
>> drivers/video/backlight/dwi_bl.c:61:16: error: implicit declaration of function 'FIELD_GET' [-Werror=implicit-function-declaration]
      61 |         return FIELD_GET(DWI_BL_CMD_DATA, cmd);
         |                ^~~~~~~~~
   cc1: some warnings being treated as errors


vim +/FIELD_PREP +46 drivers/video/backlight/dwi_bl.c

    37	
    38	static int dwi_bl_update_status(struct backlight_device *bl)
    39	{
    40		struct apple_dwi_bl *dwi_bl = bl_get_data(bl);
    41	
    42		int brightness = backlight_get_brightness(bl);
    43	
    44		u32 cmd = 0;
    45	
  > 46		cmd |= FIELD_PREP(DWI_BL_CMD_DATA, brightness);
    47		cmd |= FIELD_PREP(DWI_BL_CMD_TYPE, DWI_BL_CMD_TYPE_SET_BRIGHTNESS);
    48	
    49		writel(cmd, dwi_bl->base + DWI_BL_CMD);
    50		writel(DWI_BL_CTL_SEND, dwi_bl->base + DWI_BL_CTL);
    51	
    52		return 0;
    53	}
    54	
    55	static int dwi_bl_get_brightness(struct backlight_device *bl)
    56	{
    57		struct apple_dwi_bl *dwi_bl = bl_get_data(bl);
    58	
    59		u32 cmd = readl(dwi_bl->base + DWI_BL_CMD);
    60	
  > 61		return FIELD_GET(DWI_BL_CMD_DATA, cmd);
    62	}
    63	

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