Re: [PATCH v3 2/3] iio: adc: ad7625: add driver

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

Hi Trevor,

kernel test robot noticed the following build errors:

[auto build test ERROR on ac6a258892793f0a255fe7084ec2b612131c67fc]

url:    https://github.com/intel-lab-lkp/linux/commits/Trevor-Gamblin/dt-bindings-iio-adc-add-AD762x-AD796x-ADCs/20240819-221425
base:   ac6a258892793f0a255fe7084ec2b612131c67fc
patch link:    https://lore.kernel.org/r/20240819-ad7625_r1-v3-2-75d5217c76b5%40baylibre.com
patch subject: [PATCH v3 2/3] iio: adc: ad7625: add driver
config: alpha-randconfig-r132-20240820 (https://download.01.org/0day-ci/archive/20240820/202408201520.lFtco3eF-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.3.0
reproduce: (https://download.01.org/0day-ci/archive/20240820/202408201520.lFtco3eF-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408201520.lFtco3eF-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/iio/adc/ad7625.c: In function 'ad7625_set_sampling_freq':
>> drivers/iio/adc/ad7625.c:191:15: error: implicit declaration of function 'pwm_round_waveform_might_sleep' [-Werror=implicit-function-declaration]
     191 |         ret = pwm_round_waveform_might_sleep(st->cnv_pwm, &cnv_wf);
         |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/iio/adc/ad7625.c: In function 'ad7625_buffer_preenable':
>> drivers/iio/adc/ad7625.c:420:15: error: implicit declaration of function 'pwm_set_waveform_might_sleep' [-Werror=implicit-function-declaration]
     420 |         ret = pwm_set_waveform_might_sleep(st->cnv_pwm, &st->cnv_wf, false);
         |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/pwm_round_waveform_might_sleep +191 drivers/iio/adc/ad7625.c

   175	
   176	static int ad7625_set_sampling_freq(struct ad7625_state *st, int freq)
   177	{
   178		u64 target;
   179		struct pwm_waveform clk_gate_wf = { }, cnv_wf = { };
   180		int ret;
   181	
   182		target = DIV_ROUND_UP_ULL(NSEC_PER_SEC, freq);
   183		cnv_wf.period_length_ns = clamp(target, 100, 10 * KILO);
   184	
   185		/*
   186		 * Use the maximum conversion time t_CNVH from the datasheet as
   187		 * the duty_cycle for ref_clk, cnv, and clk_gate
   188		 */
   189		cnv_wf.duty_length_ns = st->info->timing_spec->conv_high_ns;
   190	
 > 191		ret = pwm_round_waveform_might_sleep(st->cnv_pwm, &cnv_wf);
   192		if (ret)
   193			return ret;
   194	
   195		/*
   196		 * Set up the burst signal for transferring data. period and
   197		 * offset should mirror the CNV signal
   198		 */
   199		clk_gate_wf.period_length_ns = cnv_wf.period_length_ns;
   200	
   201		clk_gate_wf.duty_length_ns = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC *
   202			st->info->chan_spec.scan_type.realbits,
   203			st->ref_clk_rate_hz);
   204	
   205		/* max t_MSB from datasheet */
   206		clk_gate_wf.duty_offset_ns = st->info->timing_spec->conv_msb_ns;
   207	
   208		ret = pwm_round_waveform_might_sleep(st->clk_gate_pwm, &clk_gate_wf);
   209		if (ret)
   210			return ret;
   211	
   212		st->cnv_wf = cnv_wf;
   213		st->clk_gate_wf = clk_gate_wf;
   214	
   215		/* TODO: Add a rounding API for PWMs that can simplify this */
   216		target = DIV_ROUND_CLOSEST_ULL(st->ref_clk_rate_hz, freq);
   217		st->sampling_freq_hz = DIV_ROUND_CLOSEST_ULL(st->ref_clk_rate_hz,
   218							     target);
   219	
   220		return 0;
   221	}
   222	

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