[PATCH 2/2] pwm: airoha: Add support for EN7581 SoC

[kernel test robot]

Hi Lorenzo,

kernel test robot noticed the following build errors:

[auto build test ERROR on robh/for-next]
[also build test ERROR on linus/master thierry-reding-pwm/for-next v6.11-rc2 next-20240809]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Lorenzo-Bianconi/dt-bindings-pwm-Document-Airoha-EN7581-PWM/20240810-143716
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/a03f5ea9291e39eab303696eb03fdd44cf04e8d9.1723264979.git.lorenzo%40kernel.org
patch subject: [PATCH 2/2] pwm: airoha: Add support for EN7581 SoC
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20240811/202408110920.KEW33sRE-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project f86594788ce93b696675c94f54016d27a6c21d18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240811/202408110920.KEW33sRE-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408110920.KEW33sRE-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/pwm/pwm-airoha.c:7:
   In file included from include/linux/io.h:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     548 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     561 |         val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   In file included from drivers/pwm/pwm-airoha.c:7:
   In file included from include/linux/io.h:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     574 |         val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                                                   ^
   In file included from drivers/pwm/pwm-airoha.c:7:
   In file included from include/linux/io.h:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     585 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     595 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     605 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
>> drivers/pwm/pwm-airoha.c:239:19: error: call to undeclared function '__bf_shf'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     239 |         val = (period << __bf_shf(mask)) & mask;
         |                          ^
   drivers/pwm/pwm-airoha.c:271:24: error: call to undeclared function '__bf_shf'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     271 |         val = ((index & 7) << __bf_shf(mask)) & mask;
         |                               ^
   6 warnings and 2 errors generated.


vim +/__bf_shf +239 drivers/pwm/pwm-airoha.c

   231	
   232	static void airoha_pwm_config_waveform(struct airoha_pwm *pc, int index,
   233					       u32 duty, u32 period)
   234	{
   235		u32 mask, val;
   236	
   237		/* Configure frequency divisor */
   238		mask = WAVE_GEN_CYCLE_MASK(index % 4);
 > 239		val = (period << __bf_shf(mask)) & mask;
   240		airoha_pwm_cycle_rmw(pc, REG_CYCLE_CFG_VALUE(index / 4), mask, val);
   241	
   242		/* Configure duty cycle */
   243		duty = ((DUTY_FULL - duty) << 8) | duty;
   244		mask = GPIO_FLASH_PRD_MASK(index % 2);
   245		val = (duty << __bf_shf(mask)) & mask;
   246		airoha_pwm_flash_rmw(pc, REG_GPIO_FLASH_PRD_SET(index / 2), mask, val);
   247	}
   248	

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