linux-kernel - Re: [PATCH v5] staging: fbtft: use dev_of

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Message-ID: <202601121705.2kgxpvsS-lkp@intel.com>
Date: Mon, 12 Jan 2026 18:05:13 +0800
From: kernel test robot <lkp@...el.com>
To: Chintan Patel <chintanlike@...il.com>, linux-fbdev@...r.kernel.org,
	linux-staging@...ts.linux.dev, linux-omap@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	tzimmermann@...e.de, andy@...nel.org, deller@....de,
	gregkh@...uxfoundation.org, Chintan Patel <chintanlike@...il.com>,
	kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v5] staging: fbtft: use dev_of_fbinfo() instead of
 info->dev

Hi Chintan,

kernel test robot noticed the following build errors:

[auto build test ERROR on staging/staging-testing]

url:    https://github.com/intel-lab-lkp/linux/commits/Chintan-Patel/staging-fbtft-use-dev_of_fbinfo-instead-of-info-dev/20260112-091221
base:   staging/staging-testing
patch link:    https://lore.kernel.org/r/20260112010740.186248-1-chintanlike%40gmail.com
patch subject: [PATCH v5] staging: fbtft: use dev_of_fbinfo() instead of info->dev
config: x86_64-randconfig-005-20260112 (https://download.01.org/0day-ci/archive/20260112/202601121705.2kgxpvsS-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260112/202601121705.2kgxpvsS-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601121705.2kgxpvsS-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/staging/fbtft/fbtft-core.c:367:23: error: call to undeclared function 'dev_of_fbinfo'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     367 |         struct device *dev = dev_of_fbinfo(info);
         |                              ^
>> drivers/staging/fbtft/fbtft-core.c:367:17: error: incompatible integer to pointer conversion initializing 'struct device *' with an expression of type 'int' [-Wint-conversion]
     367 |         struct device *dev = dev_of_fbinfo(info);
         |                        ^     ~~~~~~~~~~~~~~~~~~~
   drivers/staging/fbtft/fbtft-core.c:393:23: error: call to undeclared function 'dev_of_fbinfo'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     393 |         struct device *dev = dev_of_fbinfo(info);
         |                              ^
   drivers/staging/fbtft/fbtft-core.c:393:17: error: incompatible integer to pointer conversion initializing 'struct device *' with an expression of type 'int' [-Wint-conversion]
     393 |         struct device *dev = dev_of_fbinfo(info);
         |                        ^     ~~~~~~~~~~~~~~~~~~~
   drivers/staging/fbtft/fbtft-core.c:744:23: error: call to undeclared function 'dev_of_fbinfo'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     744 |         struct device *dev = dev_of_fbinfo(fb_info);
         |                              ^
   drivers/staging/fbtft/fbtft-core.c:744:17: error: incompatible integer to pointer conversion initializing 'struct device *' with an expression of type 'int' [-Wint-conversion]
     744 |         struct device *dev = dev_of_fbinfo(fb_info);
         |                        ^     ~~~~~~~~~~~~~~~~~~~~~~
   6 errors generated.


vim +/dev_of_fbinfo +367 drivers/staging/fbtft/fbtft-core.c

   360	
   361	static int fbtft_fb_setcolreg(unsigned int regno, unsigned int red,
   362				      unsigned int green, unsigned int blue,
   363				      unsigned int transp, struct fb_info *info)
   364	{
   365		unsigned int val;
   366		int ret = 1;
 > 367		struct device *dev = dev_of_fbinfo(info);
   368	
   369		dev_dbg(dev,
   370			"%s(regno=%u, red=0x%X, green=0x%X, blue=0x%X, trans=0x%X)\n",
   371			__func__, regno, red, green, blue, transp);
   372	
   373		switch (info->fix.visual) {
   374		case FB_VISUAL_TRUECOLOR:
   375			if (regno < 16) {
   376				u32 *pal = info->pseudo_palette;
   377	
   378				val  = chan_to_field(red,   &info->var.red);
   379				val |= chan_to_field(green, &info->var.green);
   380				val |= chan_to_field(blue,  &info->var.blue);
   381	
   382				pal[regno] = val;
   383				ret = 0;
   384			}
   385			break;
   386		}
   387		return ret;
   388	}
   389	

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