[mingo-tip:sched/headers 1770/2356] drivers/iio/dac/ltc2688.c:711:47: warning: incompatible integer to pointer conversion passing 'int' to parameter of type 'struct device_node *'

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

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head:   af93551cf39027d176f30b9beafc60a4c130998a
commit: 323ab388e14d9548f526543e901e7feb2459c442 [1770/2356] headers/deps: ACPI: Optimize <linux/acpi.h> dependencies, remove <linux/irqdomain.h> inclusion
config: x86_64-randconfig-a012-20220418 (https://download.01.org/0day-ci/archive/20220419/202204191213.e2qAQvKm-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 429cbac0390654f90bba18a41799464adf31a5ec)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=323ab388e14d9548f526543e901e7feb2459c442
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip sched/headers
        git checkout 323ab388e14d9548f526543e901e7feb2459c442
        # 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=x86_64 SHELL=/bin/bash arch/x86/kernel/ drivers/block/aoe/ drivers/bus/mhi/host/ drivers/gpu/drm/i915/ drivers/gpu/drm/tiny/ drivers/hwmon/ drivers/iio/dac/ drivers/misc/ drivers/platform/x86/ drivers/power/supply/ drivers/spi/ drivers/thermal/intel/ lib/crypto/ net/mctp/

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/iio/dac/ltc2688.c:711:47: error: implicit declaration of function 'to_of_node' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           clk = devm_get_clk_from_child(&st->spi->dev, to_of_node(node), NULL);
                                                        ^
   drivers/iio/dac/ltc2688.c:711:47: note: did you mean 'dev_of_node'?
   include/linux/device_api.h:423:35: note: 'dev_of_node' declared here
   static inline struct device_node *dev_of_node(struct device *dev)
                                     ^
>> drivers/iio/dac/ltc2688.c:711:47: warning: incompatible integer to pointer conversion passing 'int' to parameter of type 'struct device_node *' [-Wint-conversion]
           clk = devm_get_clk_from_child(&st->spi->dev, to_of_node(node), NULL);
                                                        ^~~~~~~~~~~~~~~~
   include/linux/clk.h:489:29: note: passing argument to parameter 'np' here
                                       struct device_node *np, const char *con_id);
                                                           ^
   1 warning and 1 error generated.


vim +711 drivers/iio/dac/ltc2688.c

832cb9eeb9312d Nuno Sá 2022-02-25  702  
832cb9eeb9312d Nuno Sá 2022-02-25  703  static int ltc2688_tgp_clk_setup(struct ltc2688_state *st,
832cb9eeb9312d Nuno Sá 2022-02-25  704  				 struct ltc2688_chan *chan,
832cb9eeb9312d Nuno Sá 2022-02-25  705  				 struct fwnode_handle *node, int tgp)
832cb9eeb9312d Nuno Sá 2022-02-25  706  {
832cb9eeb9312d Nuno Sá 2022-02-25  707  	unsigned long rate;
832cb9eeb9312d Nuno Sá 2022-02-25  708  	struct clk *clk;
832cb9eeb9312d Nuno Sá 2022-02-25  709  	int ret, f;
832cb9eeb9312d Nuno Sá 2022-02-25  710  
832cb9eeb9312d Nuno Sá 2022-02-25 @711  	clk = devm_get_clk_from_child(&st->spi->dev, to_of_node(node), NULL);
832cb9eeb9312d Nuno Sá 2022-02-25  712  	if (IS_ERR(clk))
832cb9eeb9312d Nuno Sá 2022-02-25  713  		return dev_err_probe(&st->spi->dev, PTR_ERR(clk),
832cb9eeb9312d Nuno Sá 2022-02-25  714  				     "failed to get tgp clk.\n");
832cb9eeb9312d Nuno Sá 2022-02-25  715  
832cb9eeb9312d Nuno Sá 2022-02-25  716  	ret = clk_prepare_enable(clk);
832cb9eeb9312d Nuno Sá 2022-02-25  717  	if (ret)
832cb9eeb9312d Nuno Sá 2022-02-25  718  		return dev_err_probe(&st->spi->dev, ret,
832cb9eeb9312d Nuno Sá 2022-02-25  719  				     "failed to enable tgp clk.\n");
832cb9eeb9312d Nuno Sá 2022-02-25  720  
832cb9eeb9312d Nuno Sá 2022-02-25  721  	ret = devm_add_action_or_reset(&st->spi->dev, ltc2688_clk_disable, clk);
832cb9eeb9312d Nuno Sá 2022-02-25  722  	if (ret)
832cb9eeb9312d Nuno Sá 2022-02-25  723  		return ret;
832cb9eeb9312d Nuno Sá 2022-02-25  724  
832cb9eeb9312d Nuno Sá 2022-02-25  725  	if (chan->toggle_chan)
832cb9eeb9312d Nuno Sá 2022-02-25  726  		return 0;
832cb9eeb9312d Nuno Sá 2022-02-25  727  
832cb9eeb9312d Nuno Sá 2022-02-25  728  	/* calculate available dither frequencies */
832cb9eeb9312d Nuno Sá 2022-02-25  729  	rate = clk_get_rate(clk);
832cb9eeb9312d Nuno Sá 2022-02-25  730  	for (f = 0; f < ARRAY_SIZE(chan->dither_frequency); f++)
832cb9eeb9312d Nuno Sá 2022-02-25  731  		chan->dither_frequency[f] = DIV_ROUND_CLOSEST(rate, ltc2688_period[f]);
832cb9eeb9312d Nuno Sá 2022-02-25  732  
832cb9eeb9312d Nuno Sá 2022-02-25  733  	return 0;
832cb9eeb9312d Nuno Sá 2022-02-25  734  }
832cb9eeb9312d Nuno Sá 2022-02-25  735  

:::::: The code at line 711 was first introduced by commit
:::::: 832cb9eeb9312dd2e14133681d3920b773ef1eac iio: dac: add support for ltc2688

:::::: TO: Nuno Sá <nuno.sa@analog.com>
:::::: CC: Jonathan Cameron <Jonathan.Cameron@huawei.com>

-- 
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