Hi Mayank,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on staging/staging-testing]

url:    https://github.com/0day-ci/linux/commits/Mayank-Suman/staging-fbtft-replaced-udelay-with-usleep_range/20210205-171807
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 06b0c0dce88e2aa2f01343db0f26d214d7f264a0
config: arm64-randconfig-r025-20210205 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/0day-ci/linux/commit/4a777af1cc91dc603b6b92fe06fd94081dc2891e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Mayank-Suman/staging-fbtft-replaced-udelay-with-usleep_range/20210205-171807
        git checkout 4a777af1cc91dc603b6b92fe06fd94081dc2891e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/staging/fbtft/fb_ra8875.c:220:18: error: too few arguments to function call, expected 2, have 1
           usleep_range(100);
           ~~~~~~~~~~~~    ^
   include/linux/delay.h:61:6: note: 'usleep_range' declared here
   void usleep_range(unsigned long min, unsigned long max);
        ^
   drivers/staging/fbtft/fb_ra8875.c:241:18: error: too few arguments to function call, expected 2, have 1
           usleep_range(100);
           ~~~~~~~~~~~~    ^
   include/linux/delay.h:61:6: note: 'usleep_range' declared here
   void usleep_range(unsigned long min, unsigned long max);
        ^
   2 errors generated.
--
>> drivers/staging/fbtft/fb_tinylcd.c:44:18: error: too few arguments to function call, expected 2, have 1
           usleep_range(250);
           ~~~~~~~~~~~~    ^
   include/linux/delay.h:61:6: note: 'usleep_range' declared here
   void usleep_range(unsigned long min, unsigned long max);
        ^
   1 error generated.
--
>> drivers/staging/fbtft/fb_watterott.c:87:19: error: too few arguments to function call, expected 2, have 1
                   usleep_range(300);
                   ~~~~~~~~~~~~    ^
   include/linux/delay.h:61:6: note: 'usleep_range' declared here
   void usleep_range(unsigned long min, unsigned long max);
        ^
   drivers/staging/fbtft/fb_watterott.c:127:19: error: too few arguments to function call, expected 2, have 1
                   usleep_range(700);
                   ~~~~~~~~~~~~    ^
   include/linux/delay.h:61:6: note: 'usleep_range' declared here
   void usleep_range(unsigned long min, unsigned long max);
        ^
   2 errors generated.


vim +220 drivers/staging/fbtft/fb_ra8875.c

   189	
   190	static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
   191	{
   192		va_list args;
   193		int i, ret;
   194		u8 *buf = par->buf;
   195	
   196		/* slow down spi-speed for writing registers */
   197		par->fbtftops.write = write_spi;
   198	
   199		if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
   200			va_start(args, len);
   201			for (i = 0; i < len; i++)
   202				buf[i] = (u8)va_arg(args, unsigned int);
   203			va_end(args);
   204			fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device,
   205					  u8, buf, len, "%s: ", __func__);
   206		}
   207	
   208		va_start(args, len);
   209		*buf++ = 0x80;
   210		*buf = (u8)va_arg(args, unsigned int);
   211		ret = par->fbtftops.write(par, par->buf, 2);
   212		if (ret < 0) {
   213			va_end(args);
   214			dev_err(par->info->device, "write() failed and returned %dn",
   215				ret);
   216			return;
   217		}
   218		len--;
   219	
 > 220		usleep_range(100);
   221	
   222		if (len) {
   223			buf = (u8 *)par->buf;
   224			*buf++ = 0x00;
   225			i = len;
   226			while (i--)
   227				*buf++ = (u8)va_arg(args, unsigned int);
   228	
   229			ret = par->fbtftops.write(par, par->buf, len + 1);
   230			if (ret < 0) {
   231				va_end(args);
   232				dev_err(par->info->device,
   233					"write() failed and returned %dn", ret);
   234				return;
   235			}
   236		}
   237		va_end(args);
   238	
   239		/* restore user spi-speed */
   240		par->fbtftops.write = fbtft_write_spi;
   241		usleep_range(100);
   242	}
   243	

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org