Re: [PATCH 2/2] watchdog: Add support for Airoha EN7851 watchdog

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

Hi Christian,

kernel test robot noticed the following build errors:

[auto build test ERROR on robh/for-next]
[also build test ERROR on groeck-staging/hwmon-next linus/master v6.11 next-20240920]
[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/Christian-Marangi/watchdog-Add-support-for-Airoha-EN7851-watchdog/20240919-203006
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20240919122759.10456-2-ansuelsmth%40gmail.com
patch subject: [PATCH 2/2] watchdog: Add support for Airoha EN7851 watchdog
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20240922/202409221503.OVlRRuM7-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 8663a75fa2f31299ab8d1d90288d9df92aadee88)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240922/202409221503.OVlRRuM7-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/202409221503.OVlRRuM7-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/watchdog/airoha_wdt.c:17:
   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/watchdog/airoha_wdt.c:17:
   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/watchdog/airoha_wdt.c:17:
   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/watchdog/airoha_wdt.c:155:26: error: call to undeclared function 'FIELD_MAX'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     155 |         wdog_dev->max_timeout = FIELD_MAX(WDT_TIMER_VAL) / airoha_wdt->wdt_freq;
         |                                 ^
   6 warnings and 1 error generated.


vim +/FIELD_MAX +155 drivers/watchdog/airoha_wdt.c

   125	
   126	static int airoha_wdt_probe(struct platform_device *pdev)
   127	{
   128		struct device *dev = &pdev->dev;
   129		struct watchdog_device *wdog_dev;
   130		struct airoha_wdt_desc *airoha_wdt;
   131		int ret;
   132	
   133		airoha_wdt = devm_kzalloc(dev, sizeof(*airoha_wdt), GFP_KERNEL);
   134		if (!airoha_wdt)
   135			return -ENOMEM;
   136	
   137		airoha_wdt->base = devm_platform_ioremap_resource(pdev, 0);
   138		if (IS_ERR(airoha_wdt->base))
   139			return PTR_ERR(airoha_wdt->base);
   140	
   141		ret = device_property_read_u32(dev, "clock-frequency",
   142					       &airoha_wdt->wdt_freq);
   143		if (ret)
   144			return -EINVAL;
   145	
   146		/* Watchdog ticks at half the bus rate */
   147		airoha_wdt->wdt_freq /= 2;
   148	
   149		/* Initialize struct watchdog device */
   150		wdog_dev = &airoha_wdt->wdog_dev;
   151		wdog_dev->timeout = heartbeat;
   152		wdog_dev->info = &airoha_wdt_info;
   153		wdog_dev->ops = &airoha_wdt_ops;
   154		/* Bus 300MHz, watchdog 150MHz, 28 seconds */
 > 155		wdog_dev->max_timeout = FIELD_MAX(WDT_TIMER_VAL) / airoha_wdt->wdt_freq;
   156		wdog_dev->parent = dev;
   157	
   158		watchdog_set_drvdata(wdog_dev, airoha_wdt);
   159		watchdog_set_nowayout(wdog_dev, nowayout);
   160		watchdog_stop_on_unregister(wdog_dev);
   161	
   162		ret = devm_watchdog_register_device(dev, wdog_dev);
   163		if (ret)
   164			return ret;
   165	
   166		platform_set_drvdata(pdev, airoha_wdt);
   167		return 0;
   168	}
   169	

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