linux-kernel - Re: [PATCH 2/3] iio: light: add AMS TCS3400 RGB and RGB-IR color sensor driver

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Message-ID: <202601201908.GaxFkE6t-lkp@intel.com>
Date: Tue, 20 Jan 2026 19:32:19 +0800
From: kernel test robot <lkp@...el.com>
To: Petr Hodina via B4 Relay <devnull+petr.hodina.protonmail.com@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	David Heidelberg <david@...t.cz>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	Petr Hodina <petr.hodina@...tonmail.com>
Subject: Re: [PATCH 2/3] iio: light: add AMS TCS3400 RGB and RGB-IR color
 sensor driver

Hi Petr,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 46fe65a2c28ecf5df1a7475aba1f08ccf4c0ac1b]

url:    https://github.com/intel-lab-lkp/linux/commits/Petr-Hodina-via-B4-Relay/doc-add-Device-Tree-binding-for-AMS-TCS3400-light-sensor/20260120-012240
base:   46fe65a2c28ecf5df1a7475aba1f08ccf4c0ac1b
patch link:    https://lore.kernel.org/r/20260119-tsc3400-v1-2-82a65c5417aa%40protonmail.com
patch subject: [PATCH 2/3] iio: light: add AMS TCS3400 RGB and RGB-IR color sensor driver
config: x86_64-allmodconfig (https://download.01.org/0day-ci/archive/20260120/202601201908.GaxFkE6t-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260120/202601201908.GaxFkE6t-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/202601201908.GaxFkE6t-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/iio/light/tcs3400.c:82:18: warning: unused variable 'tcs3400_gains' [-Wunused-const-variable]
      82 | static const int tcs3400_gains[] = {1, 4, 16, 64};
         |                  ^~~~~~~~~~~~~
   1 warning generated.


vim +/tcs3400_gains +82 drivers/iio/light/tcs3400.c

    81	
  > 82	static const int tcs3400_gains[] = {1, 4, 16, 64};
    83	

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