Re: [PATCH] rtc: rv3028: configure backup switch mode from device tree

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

Hi Dhaval,

kernel test robot noticed the following build warnings:

[auto build test WARNING on abelloni/rtc-next]
[also build test WARNING on linus/master v7.2 next-20260821]
[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/Dhaval-Shiroya/rtc-rv3028-configure-backup-switch-mode-from-device-tree/20260822-145911
base:   https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git rtc-next
patch link:    https://lore.kernel.org/r/20260822092911.318342-1-dhaval.shiroya%40siliconsignals.io
patch subject: [PATCH] rtc: rv3028: configure backup switch mode from device tree
config: nios2-allmodconfig (https://download.01.org/0day-ci/archive/20260825/202608250920.y0Rb4vg9-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260825/202608250920.y0Rb4vg9-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/202608250920.y0Rb4vg9-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/device.h:15,
                    from include/linux/acpi.h:15,
                    from include/linux/i2c.h:13,
                    from drivers/rtc/rtc-rv3028.c:15:
   drivers/rtc/rtc-rv3028.c: In function 'rv3028_set_bsm_from_dt':
>> drivers/rtc/rtc-rv3028.c:906:18: warning: format '%x' expects argument of type 'unsigned int', but argument 5 has type 'long unsigned int' [-Wformat=]
     906 |                  "setting backup switch mode to %u (reg 0x37: 0x%02x -> 0x%02x)\n",
         |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/dev_printk.h:110:30: note: in definition of macro 'dev_printk_index_wrap'
     110 |                 _p_func(dev, fmt, ##__VA_ARGS__);                       \
         |                              ^~~
   include/linux/dev_printk.h:160:58: note: in expansion of macro 'dev_fmt'
     160 |         dev_printk_index_wrap(_dev_info, KERN_INFO, dev, dev_fmt(fmt), ##__VA_ARGS__)
         |                                                          ^~~~~~~
   drivers/rtc/rtc-rv3028.c:905:9: note: in expansion of macro 'dev_info'
     905 |         dev_info(&client->dev,
         |         ^~~~~~~~
   drivers/rtc/rtc-rv3028.c:906:78: note: format string is defined here
     906 |                  "setting backup switch mode to %u (reg 0x37: 0x%02x -> 0x%02x)\n",
         |                                                                           ~~~^
         |                                                                              |
         |                                                                              unsigned int
         |                                                                           %02lx


vim +906 drivers/rtc/rtc-rv3028.c

   857	
   858	/*
   859	 * Configure backup switchover mode from device tree.
   860	 *   0 = disabled
   861	 *   1 = DSM (Direct Switching Mode)  - switch when VDD < VBACKUP
   862	 *   3 = LSM (Level Switching Mode)   - switch when VDD < 2.0V
   863	 */
   864	static int rv3028_set_bsm_from_dt(struct rv3028_data *rv3028,
   865					  struct i2c_client *client)
   866	{
   867		u32 val_old, bsm_dt, bsm_bits;
   868		int ret;
   869	
   870		if (device_property_read_u32(&client->dev, "backup-switch-mode",
   871					     &bsm_dt))
   872			return 0;
   873	
   874		/* Validate and convert DT value to register bits */
   875		switch (bsm_dt) {
   876		case 0:
   877			bsm_bits = 0;
   878			break;
   879		case 1:
   880			bsm_bits = FIELD_PREP(RV3028_BACKUP_BSM, RV3028_BACKUP_BSM_DSM);
   881			break;
   882		case 3:
   883			bsm_bits = FIELD_PREP(RV3028_BACKUP_BSM, RV3028_BACKUP_BSM_LSM);
   884			break;
   885		default:
   886			dev_warn(&client->dev,
   887				 "invalid backup-switch-mode %u (use 0, 1, or 3)\n",
   888				 bsm_dt);
   889			return 0;
   890		}
   891	
   892		/* Read current BACKUP register */
   893		ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &val_old);
   894		if (ret < 0)
   895			return ret;
   896	
   897		/* Check if BSM and FEDE already match desired values */
   898		if ((val_old & (RV3028_BACKUP_BSM | RV3028_BACKUP_FEDE)) ==
   899		    (bsm_bits | RV3028_BACKUP_FEDE)) {
   900			dev_dbg(&client->dev,
   901				"backup switch mode already set to %u\n", bsm_dt);
   902			return 0;
   903		}
   904	
   905		dev_info(&client->dev,
 > 906			 "setting backup switch mode to %u (reg 0x37: 0x%02x -> 0x%02x)\n",
   907			 bsm_dt, val_old,
   908			 (val_old & ~(RV3028_BACKUP_BSM | RV3028_BACKUP_FEDE)) |
   909			 bsm_bits | RV3028_BACKUP_FEDE);
   910	
   911		/* Set BSM and always enable FEDE as recommended by datasheet */
   912		return rv3028_update_cfg(rv3028, RV3028_BACKUP,
   913					 RV3028_BACKUP_BSM | RV3028_BACKUP_FEDE,
   914					 bsm_bits | RV3028_BACKUP_FEDE);
   915	}
   916	

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