[PATCH v2 4/4] hwmon: Support Aspeed AST2600 PWM/Fan tachometer

[kernel test robot]

Hi Troy,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on hwmon/hwmon-next]
[also build test WARNING on joel-aspeed/for-next v5.11-rc3 next-20210113]
[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/Troy-Lee/hwmon-aspeed2600-pwm-tacho-Add-driver-support/20210113-151325
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: riscv-randconfig-r023-20210113 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 68ff52ffead2ba25cca442778ab19286000daad7)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/0day-ci/linux/commit/19a51124badf28349d26657b611da77d5dfba2f1
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Troy-Lee/hwmon-aspeed2600-pwm-tacho-Add-driver-support/20210113-151325
        git checkout 19a51124badf28349d26657b611da77d5dfba2f1
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 

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

All warnings (new ones prefixed by >>):

>> drivers/hwmon/aspeed2600-pwm-tacho.c:581:5: warning: no previous prototype for function 'aspeed_pwm_tacho_read' [-Wmissing-prototypes]
   int aspeed_pwm_tacho_read(struct device *dev, enum hwmon_sensor_types type,
       ^
   drivers/hwmon/aspeed2600-pwm-tacho.c:581:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int aspeed_pwm_tacho_read(struct device *dev, enum hwmon_sensor_types type,
   ^
   static 
>> drivers/hwmon/aspeed2600-pwm-tacho.c:615:5: warning: no previous prototype for function 'aspeed_pwm_tacho_write' [-Wmissing-prototypes]
   int aspeed_pwm_tacho_write(struct device *dev, enum hwmon_sensor_types type,
       ^
   drivers/hwmon/aspeed2600-pwm-tacho.c:615:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int aspeed_pwm_tacho_write(struct device *dev, enum hwmon_sensor_types type,
   ^
   static 
   2 warnings generated.


vim +/aspeed_pwm_tacho_read +581 drivers/hwmon/aspeed2600-pwm-tacho.c

   580	
 > 581	int aspeed_pwm_tacho_read(struct device *dev, enum hwmon_sensor_types type,
   582				u32 attr, int channel, long *val)
   583	{
   584		struct aspeed_pwm_tachometer_data *priv = dev_get_drvdata(dev);
   585		long rpm;
   586	
   587		switch (type) {
   588		case hwmon_pwm:
   589			switch (attr) {
   590			case hwmon_pwm_input:
   591				*val = priv->pwm_channel[channel].falling;
   592				break;
   593			default:
   594				return -EOPNOTSUPP;
   595			}
   596			break;
   597		case hwmon_fan:
   598			switch (attr) {
   599			case hwmon_fan_input:
   600				rpm = aspeed_get_fan_tach_ch_rpm(dev, priv, channel);
   601				if (rpm < 0)
   602					return rpm;
   603				*val = rpm;
   604				break;
   605			default:
   606				return -EOPNOTSUPP;
   607			}
   608			break;
   609		default:
   610			return -EOPNOTSUPP;
   611		}
   612		return 0;
   613	}
   614	
 > 615	int aspeed_pwm_tacho_write(struct device *dev, enum hwmon_sensor_types type,
   616				u32 attr, int channel, long val)
   617	{
   618		switch (type) {
   619		case hwmon_pwm:
   620			switch (attr) {
   621			case hwmon_pwm_input:
   622				return set_pwm(dev, channel, val);
   623			default:
   624				return -EOPNOTSUPP;
   625			}
   626			break;
   627		default:
   628			return -EOPNOTSUPP;
   629		}
   630		return -EOPNOTSUPP;
   631	}
   632	

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