[PATCH] gpio: pcf857x: Make teardown callback return void

[kernel test robot]

Hi "Uwe,

I love your patch! Yet something to improve:

[auto build test ERROR on e8b767f5e04097aaedcd6e06e2270f9fe5282696]

url:    https://github.com/intel-lab-lkp/linux/commits/Uwe-Kleine-K-nig/gpio-pcf857x-Make-teardown-callback-return-void/20220402-010754
base:   e8b767f5e04097aaedcd6e06e2270f9fe5282696
config: arm-davinci_all_defconfig (https://download.01.org/0day-ci/archive/20220403/202204032242.oF5ZiIfP-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c4a1b07d0979e7ff20d7d541af666d822d66b566)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/intel-lab-lkp/linux/commit/a3a8679599814e10a75617073b06db14ef794a54
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Uwe-Kleine-K-nig/gpio-pcf857x-Make-teardown-callback-return-void/20220402-010754
        git checkout a3a8679599814e10a75617073b06db14ef794a54
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

>> arch/arm/mach-davinci/board-dm644x-evm.c:499:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
   }
   ^
>> arch/arm/mach-davinci/board-dm644x-evm.c:504:14: error: incompatible function pointer types initializing 'void (*)(struct i2c_client *, int, unsigned int, void *)' with an expression of type 'int (struct i2c_client *, int, unsigned int, void *)' [-Werror,-Wincompatible-function-pointer-types]
           .teardown       = evm_u35_teardown,
                             ^~~~~~~~~~~~~~~~
   2 errors generated.


vim +499 arch/arm/mach-davinci/board-dm644x-evm.c

7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  488  
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  489  static int
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  490  evm_u35_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  491  {
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  492  	gpio_free(gpio + 7);
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  493  	gpio_free(gpio + 6);
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  494  	gpio_free(gpio + 5);
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  495  	gpio_free(gpio + 3);
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  496  	gpio_free(gpio + 2);
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  497  	gpio_free(gpio + 1);
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  498  	gpio_free(gpio + 0);
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07 @499  }
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  500  
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  501  static struct pcf857x_platform_data pcf_data_u35 = {
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  502  	.gpio_base	= PCF_Uxx_BASE(2),
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  503  	.setup		= evm_u35_setup,
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07 @504  	.teardown	= evm_u35_teardown,
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  505  };
7bff3c4ce44ea48 arch/arm/mach-davinci/board-evm.c David Brownell 2008-09-07  506  

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