drivers/pinctrl/intel/pinctrl-merrifield.c:518:10: error: implicit declaration of function 'readl'

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From	kbuild test robot <fengguang.wu@intel.com>
Newsgroups	linux.kernel
Subject	drivers/pinctrl/intel/pinctrl-merrifield.c:518:10: error: implicit declaration of function 'readl'
Date	Mon, 08 Aug 2016 03:50:01 +0200
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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   29b4817d4018df78086157ea3a55c1d9424a7cfc
commit: 4e80c8f505741cbdef3e10862ea36057e8d85e7c pinctrl: intel: Add Intel Merrifield pin controller support
date:   6 weeks ago
config: x86_64-randconfig-x012-201632 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        git checkout 4e80c8f505741cbdef3e10862ea36057e8d85e7c
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/pinctrl/intel/pinctrl-merrifield.c: In function 'mrfld_pin_dbg_show':
>> drivers/pinctrl/intel/pinctrl-merrifield.c:518:10: error: implicit declaration of function 'readl' [-Werror=implicit-function-declaration]
     value = readl(bufcfg);
             ^~~~~
   drivers/pinctrl/intel/pinctrl-merrifield.c: In function 'mrfld_update_bufcfg':
>> drivers/pinctrl/intel/pinctrl-merrifield.c:575:2: error: implicit declaration of function 'writel' [-Werror=implicit-function-declaration]
     writel(value, bufcfg);
     ^~~~~~
   cc1: some warnings being treated as errors

vim +/readl +518 drivers/pinctrl/intel/pinctrl-merrifield.c

   512		if (!mrfld_buf_available(mp, pin)) {
   513			seq_puts(s, "not available");
   514			return;
   515		}
   516	
   517		bufcfg = mrfld_get_bufcfg(mp, pin);
 > 518		value = readl(bufcfg);
   519	
   520		mode = (value & BUFCFG_PINMODE_MASK) >> BUFCFG_PINMODE_SHIFT;
   521		if (!mode)
   522			seq_puts(s, "GPIO ");
   523		else
   524			seq_printf(s, "mode %d ", mode);
   525	
   526		seq_printf(s, "0x%08x", value);
   527	}
   528	
   529	static const struct pinctrl_ops mrfld_pinctrl_ops = {
   530		.get_groups_count = mrfld_get_groups_count,
   531		.get_group_name = mrfld_get_group_name,
   532		.get_group_pins = mrfld_get_group_pins,
   533		.pin_dbg_show = mrfld_pin_dbg_show,
   534	};
   535	
   536	static int mrfld_get_functions_count(struct pinctrl_dev *pctldev)
   537	{
   538		struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
   539	
   540		return mp->nfunctions;
   541	}
   542	
   543	static const char *mrfld_get_function_name(struct pinctrl_dev *pctldev,
   544						   unsigned int function)
   545	{
   546		struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
   547	
   548		return mp->functions[function].name;
   549	}
   550	
   551	static int mrfld_get_function_groups(struct pinctrl_dev *pctldev,
   552					     unsigned int function,
   553					     const char * const **groups,
   554					     unsigned int * const ngroups)
   555	{
   556		struct mrfld_pinctrl *mp = pinctrl_dev_get_drvdata(pctldev);
   557	
   558		*groups = mp->functions[function].groups;
   559		*ngroups = mp->functions[function].ngroups;
   560		return 0;
   561	}
   562	
   563	static void mrfld_update_bufcfg(struct mrfld_pinctrl *mp, unsigned int pin,
   564					u32 bits, u32 mask)
   565	{
   566		void __iomem *bufcfg;
   567		u32 value;
   568	
   569		bufcfg = mrfld_get_bufcfg(mp, pin);
   570		value = readl(bufcfg);
   571	
   572		value &= ~mask;
   573		value |= bits & mask;
   574	
 > 575		writel(value, bufcfg);
   576	}
   577	
   578	static int mrfld_pinmux_set_mux(struct pinctrl_dev *pctldev,

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drivers/pinctrl/intel/pinctrl-merrifield.c:518:10: error: implicit  declaration of function 'readl' kbuild test robot <fengguang.wu@intel.com> - 2016-08-08 03:50 +0200
  Re: drivers/pinctrl/intel/pinctrl-merrifield.c:518:10: error:  implicit declaration of function 'readl' Andy Shevchenko <andriy.shevchenko@linux.intel.com> - 2016-08-09 18:00 +0200

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