Hi Peter,

[auto build test ERROR on tty/tty-testing]
[also build test ERROR on v4.4 next-20160115]
[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/Peter-Hurley/Earlycon-cleanup/20160117-054602
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
config: x86_64-randconfig-x012-201603 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   drivers/tty/serial/earlycon.c: In function 'of_setup_earlycon':
>> drivers/tty/serial/earlycon.c:235:8: error: implicit declaration of function 'of_get_flat_dt_prop' [-Werror=implicit-function-declaration]
     val = of_get_flat_dt_prop(node, "reg-offset", NULL);
           ^
>> drivers/tty/serial/earlycon.c:235:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     val = of_get_flat_dt_prop(node, "reg-offset", NULL);
         ^
   drivers/tty/serial/earlycon.c:238:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     val = of_get_flat_dt_prop(node, "reg-shift", NULL);
         ^
>> drivers/tty/serial/earlycon.c:241:61: warning: comparison between pointer and integer
     big_endian = of_get_flat_dt_prop(node, "big-endian", NULL) != NULL ||
                                                                ^
   drivers/tty/serial/earlycon.c:243:53: warning: comparison between pointer and integer
       of_get_flat_dt_prop(node, "native-endian", NULL) != NULL);
                                                        ^
   drivers/tty/serial/earlycon.c:244:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     val = of_get_flat_dt_prop(node, "reg-io-width", NULL);
         ^
   cc1: some warnings being treated as errors

vim +/of_get_flat_dt_prop +235 drivers/tty/serial/earlycon.c

   229		spin_lock_init(&port->lock);
   230		port->iotype = UPIO_MEM;
   231		port->mapbase = addr;
   232		port->uartclk = BASE_BAUD * 16;
   233		port->membase = earlycon_map(addr, SZ_4K);
   234	
 > 235		val = of_get_flat_dt_prop(node, "reg-offset", NULL);
   236		if (val)
   237			port->mapbase += be32_to_cpu(*val);
   238		val = of_get_flat_dt_prop(node, "reg-shift", NULL);
   239		if (val)
   240			port->regshift = be32_to_cpu(*val);
 > 241		big_endian = of_get_flat_dt_prop(node, "big-endian", NULL) != NULL ||
   242			(IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) &&
   243			 of_get_flat_dt_prop(node, "native-endian", NULL) != NULL);
   244		val = of_get_flat_dt_prop(node, "reg-io-width", NULL);

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