Re: [PATCH 3/4] leds: Add driver for the ISSI IS31FL32xx family of LED controllers

[kbuild test robot]

Hi David,

[auto build test WARNING on j.anaszewski-leds/for-next]
[also build test WARNING on next-20160302]
[cannot apply to v4.5-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help 
improving the system]

url:    
https://github.com/0day-ci/linux/commits/David-Rivshin-Allworx/leds-Add-driver-for-the-ISSI-IS31FL32xx-family-of-LED-controllers/20160303-110656
base:   https://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds 
for-next
config: sparc64-allyesconfig (attached as .config)
reproduce:
        wget 
https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross
 -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All warnings (new ones prefixed by >>):

   drivers/leds/leds-is31fl32xx.c: In function 'is31fl32xx_parse_child_dt':
>> drivers/leds/leds-is31fl32xx.c:344:6: warning: passing argument 1 of 
>> 'of_property_read_string' discards 'const' qualifier from pointer target type
     if (of_property_read_string(child, "label", &cdev->name))
         ^
   In file included from arch/sparc/include/asm/openprom.h:14:0,
                    from arch/sparc/include/asm/device.h:9,
                    from include/linux/device.h:30,
                    from include/linux/i2c.h:30,
                    from drivers/leds/leds-is31fl32xx.c:17:
   include/linux/of.h:299:12: note: expected 'struct device_node *' but 
argument is of type 'const struct device_node *'
    extern int of_property_read_string(struct device_node *np,
               ^
   drivers/leds/leds-is31fl32xx.c:356:2: warning: passing argument 1 of 
'of_property_read_string' discards 'const' qualifier from pointer target type
     of_property_read_string(child, "linux,default-trigger",
     ^
   In file included from arch/sparc/include/asm/openprom.h:14:0,
                    from arch/sparc/include/asm/device.h:9,
                    from include/linux/device.h:30,
                    from include/linux/i2c.h:30,
                    from drivers/leds/leds-is31fl32xx.c:17:
   include/linux/of.h:299:12: note: expected 'struct device_node *' but 
argument is of type 'const struct device_node *'
    extern int of_property_read_string(struct device_node *np,
               ^

vim +344 drivers/leds/leds-is31fl32xx.c

   328  }
   329  
   330  static inline size_t sizeof_is31fl32xx_priv(int num_leds)
   331  {
   332          return sizeof(struct is31fl32xx_priv) +
   333                        (sizeof(struct is31fl32xx_led_data) * num_leds);
   334  }
   335  
   336  static int is31fl32xx_parse_child_dt(const struct device *dev,
   337                                       const struct device_node *child,
   338                                       struct is31fl32xx_led_data 
*led_data)
   339  {
   340          struct led_classdev *cdev = &led_data->cdev;
   341          int ret = 0;
   342          u32 reg;
   343  
 > 344          if (of_property_read_string(child, "label", &cdev->name))
   345                  cdev->name = child->name;
   346  
   347          ret = of_property_read_u32(child, "reg", &reg);
   348          if (ret || reg < 1 || reg > led_data->priv->cdef->channels) {
   349                  dev_err(dev,
   350                          "Child node %s does not have a valid reg 
property\n",
   351                          child->full_name);
   352                  return -EINVAL;

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