Re: [PATCH v3 2/8] MIPS: ranchu: Add Goldfish RTC driver

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

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Hi Miodrag,

[auto build test ERROR on linus/master]
[also build test ERROR on next-20170721]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Aleksandar-Markovic/MIPS-Add-virtual-Ranchu-board-as-a-generic-based-board/20170724-062318
config: sparc64-allmodconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 6.3.0-18) 6.3.0 20170516
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/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 errors (new ones prefixed by >>):

   drivers/rtc/rtc-goldfish.c: In function 'goldfish_rtc_read_alarm':
>> drivers/rtc/rtc-goldfish.c:51:18: error: implicit declaration of function 'readl' [-Werror=implicit-function-declaration]
     rtc_alarm_low = readl(base + TIMER_ALARM_LOW);
                     ^~~~~
   drivers/rtc/rtc-goldfish.c: In function 'goldfish_rtc_set_alarm':
>> drivers/rtc/rtc-goldfish.c:86:3: error: implicit declaration of function 'writel' [-Werror=implicit-function-declaration]
      writel((rtc_alarm >> 32), base + TIMER_ALARM_HIGH);
      ^~~~~~
   cc1: some warnings being treated as errors

vim +/readl +51 drivers/rtc/rtc-goldfish.c

    38	
    39	static int goldfish_rtc_read_alarm(struct device *dev,
    40			struct rtc_wkalrm *alrm)
    41	{
    42		u64 rtc_alarm;
    43		u64 rtc_alarm_low;
    44		u64 rtc_alarm_high;
    45		void __iomem *base;
    46		struct goldfish_rtc *rtcdrv;
    47	
    48		rtcdrv = dev_get_drvdata(dev);
    49		base = rtcdrv->base;
    50	
  > 51		rtc_alarm_low = readl(base + TIMER_ALARM_LOW);
    52		rtc_alarm_high = readl(base + TIMER_ALARM_HIGH);
    53		rtc_alarm = (rtc_alarm_high << 32) | rtc_alarm_low;
    54	
    55		do_div(rtc_alarm, NSEC_PER_SEC);
    56		memset(alrm, 0, sizeof(struct rtc_wkalrm));
    57	
    58		rtc_time_to_tm(rtc_alarm, &(alrm->time));
    59	
    60		if (readl(base + TIMER_ALARM_STATUS))
    61			alrm->enabled = 1;
    62		else
    63			alrm->enabled = 0;
    64	
    65		return 0;
    66	}
    67	
    68	static int goldfish_rtc_set_alarm(struct device *dev,
    69			struct rtc_wkalrm *alrm)
    70	{
    71		struct goldfish_rtc *rtcdrv;
    72		unsigned long rtc_alarm;
    73		u64 rtc_status_reg;
    74		void __iomem *base;
    75		int ret = 0;
    76	
    77		rtcdrv = dev_get_drvdata(dev);
    78		base = rtcdrv->base;
    79	
    80		if (alrm->enabled) {
    81			ret = rtc_tm_to_time(&(alrm->time), &rtc_alarm);
    82			if (ret != 0)
    83				return ret;
    84	
    85			rtc_alarm *= NSEC_PER_SEC;
  > 86			writel((rtc_alarm >> 32), base + TIMER_ALARM_HIGH);
    87			writel(rtc_alarm, base + TIMER_ALARM_LOW);
    88		} else {
    89			/*
    90			 * if this function was called with enabled=0
    91			 * then it could mean that the application is
    92			 * trying to cancel an ongoing alarm
    93			 */
    94			rtc_status_reg = readl(base + TIMER_ALARM_STATUS);
    95			if (rtc_status_reg)
    96				writel(1, base + TIMER_CLEAR_ALARM);
    97		}
    98	
    99		return ret;
   100	}
   101	

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