[broonie-ci:file0IqEIN 13/14] sound/soc/codecs/rt1318.c:785:5: warning: no previous prototype for function 'rt1318_pll_calc'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/ci.git file0IqEIN
head:   04c200922d911f7a33febc0e7991f3a2efd856ad
commit: 48ed4d2435aa749a8d59fd7543313d51d0800175 [13/14] ASoC: rt1318: Add RT1318 audio amplifier driver
config: x86_64-buildonly-randconfig-005-20240619 (https://download.01.org/0day-ci/archive/20240620/202406200032.k77XsxDK-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240620/202406200032.k77XsxDK-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/202406200032.k77XsxDK-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> sound/soc/codecs/rt1318.c:785:5: warning: no previous prototype for function 'rt1318_pll_calc' [-Wmissing-prototypes]
     785 | int rt1318_pll_calc(const unsigned int freq_in,
         |     ^
   sound/soc/codecs/rt1318.c:785:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     785 | int rt1318_pll_calc(const unsigned int freq_in,
         | ^
         | static 
   sound/soc/codecs/rt1318.c:1340:3: error: field designator 'probe_new' does not refer to any field in type 'struct i2c_driver'
    1340 |         .probe_new = rt1318_i2c_probe,
         |         ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning and 1 error generated.


vim +/rt1318_pll_calc +785 sound/soc/codecs/rt1318.c

   784	
 > 785	int rt1318_pll_calc(const unsigned int freq_in,
   786		const unsigned int freq_out, struct rt1318_pll_code *pll_code)
   787	{
   788		int max_n = RT1318_PLL_N_MAX, max_m = RT1318_PLL_M_MAX;
   789		int i, k, red, n_t, pll_out, in_t, out_t;
   790		int n = 0, m = 0, m_t = 0;
   791		int red_t = abs(freq_out - freq_in);
   792		bool m_bypass = false, k_bypass = false;
   793	
   794		if (RT1318_PLL_INP_MAX < freq_in || RT1318_PLL_INP_MIN > freq_in)
   795			return -EINVAL;
   796	
   797		for (i = 0; i < ARRAY_SIZE(pll_preset_table); i++) {
   798			if (freq_in == pll_preset_table[i].pll_in &&
   799				freq_out == pll_preset_table[i].pll_out) {
   800				k = pll_preset_table[i].k;
   801				m = pll_preset_table[i].m;
   802				n = pll_preset_table[i].n;
   803				m_bypass = pll_preset_table[i].m_bp;
   804				k_bypass = pll_preset_table[i].k_bp;
   805				goto code_find;
   806			}
   807		}
   808	
   809		k = 100000000 / freq_out - 2;
   810		if (k > RT1318_PLL_K_MAX)
   811			k = RT1318_PLL_K_MAX;
   812		if (k < 0) {
   813			k = 0;
   814			k_bypass = true;
   815		}
   816		for (n_t = 0; n_t <= max_n; n_t++) {
   817			in_t = freq_in / (k_bypass ? 1 : (k + 2));
   818			pll_out = freq_out / (n_t + 2);
   819			if (in_t < 0)
   820				continue;
   821			if (in_t == pll_out) {
   822				m_bypass = true;
   823				n = n_t;
   824				goto code_find;
   825			}
   826			red = abs(in_t - pll_out);
   827			if (red < red_t) {
   828				m_bypass = true;
   829				n = n_t;
   830				m = m_t;
   831				if (red == 0)
   832					goto code_find;
   833				red_t = red;
   834			}
   835			for (m_t = 0; m_t <= max_m; m_t++) {
   836				out_t = in_t / (m_t + 2);
   837				red = abs(out_t - pll_out);
   838				if (red < red_t) {
   839					m_bypass = false;
   840					n = n_t;
   841					m = m_t;
   842					if (red == 0)
   843						goto code_find;
   844					red_t = red;
   845				}
   846			}
   847		}
   848		pr_debug("Only get approximation about PLL\n");
   849	
   850	code_find:
   851	
   852		pll_code->m_bp = m_bypass;
   853		pll_code->k_bp = k_bypass;
   854		pll_code->m_code = m;
   855		pll_code->n_code = n;
   856		pll_code->k_code = k;
   857		return 0;
   858	}
   859	

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