Re: [PATCH 2/3] hwmon: ltc2992: Add support for GPIOs.

[kernel test robot <lkp@intel.com>]

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Hi,

I love your patch! Perhaps something to improve:

[auto build test WARNING on hwmon/hwmon-next]
[also build test WARNING on linus/master linux/master v5.10-rc1 next-20201029]
[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]

url:    https://github.com/0day-ci/linux/commits/alexandru-tachici-analog-com/hwmon-ltc2992-Add-support/20201029-174720
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: x86_64-randconfig-r023-20201030 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 772aaa602383cf82795572ebcd86b0e660f3579f)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/f74af3cc59b7d9de6545502e7d01df6e01f96773
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review alexandru-tachici-analog-com/hwmon-ltc2992-Add-support/20201029-174720
        git checkout f74af3cc59b7d9de6545502e7d01df6e01f96773
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> drivers/hwmon/ltc2992.c:276:6: warning: no previous prototype for function 'ltc2992_gpio_set_multiple' [-Wmissing-prototypes]
   void ltc2992_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits)
        ^
   drivers/hwmon/ltc2992.c:276:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void ltc2992_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits)
   ^
   static 
   1 warning generated.

vim +/ltc2992_gpio_set_multiple +276 drivers/hwmon/ltc2992.c

   275	
 > 276	void ltc2992_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits)
   277	{
   278		struct ltc2992_state *st = gpiochip_get_data(chip);
   279		unsigned long gpio_ctrl_io = 0;
   280		unsigned long gpio_ctrl = 0;
   281		unsigned int gpio_nr;
   282	
   283		for_each_set_bit(gpio_nr, mask, LTC2992_GPIO_NR) {
   284			if (gpio_nr < 3)
   285				assign_bit(ltc2992_gpio_addr_map[gpio_nr].ctrl_bit, &gpio_ctrl_io, true);
   286	
   287			if (gpio_nr == 3)
   288				assign_bit(ltc2992_gpio_addr_map[gpio_nr].ctrl_bit, &gpio_ctrl, true);
   289		}
   290	
   291		mutex_lock(&st->gpio_mutex);
   292		ltc2992_write_reg(st, LTC2992_GPIO_IO_CTRL, 1, gpio_ctrl_io);
   293		ltc2992_write_reg(st, LTC2992_GPIO_CTRL, 1, gpio_ctrl);
   294		mutex_unlock(&st->gpio_mutex);
   295	}
   296	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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