Hi Christophe,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on mtd/nand/next]
[also build test WARNING on v4.19-rc4 next-20180913]
[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/christophe-kerello-st-com/mtd-rawnand-add-STM32-FMC2-NAND-flash-controller-driver/20180918-000016
base:   git://git.infradead.org/linux-mtd.git nand/next
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=ia64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/clk.h:16,
                    from drivers/mtd/nand/raw/stm32_fmc2_nand.c:7:
   drivers/mtd/nand/raw/stm32_fmc2_nand.c: In function 'stm32_fmc2_read_data':
>> drivers/mtd/nand/raw/stm32_fmc2_nand.c:838:17: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     if (IS_ALIGNED((u32)buf, sizeof(u32)) && IS_ALIGNED(len, sizeof(u32))) {
                    ^
   include/linux/kernel.h:62:30: note: in definition of macro 'IS_ALIGNED'
    #define IS_ALIGNED(x, a)  (((x) & ((typeof(x))(a) - 1)) == 0)
                                 ^
>> drivers/mtd/nand/raw/stm32_fmc2_nand.c:838:17: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     if (IS_ALIGNED((u32)buf, sizeof(u32)) && IS_ALIGNED(len, sizeof(u32))) {
                    ^
   include/linux/kernel.h:62:44: note: in definition of macro 'IS_ALIGNED'
    #define IS_ALIGNED(x, a)  (((x) & ((typeof(x))(a) - 1)) == 0)
                                               ^
   drivers/mtd/nand/raw/stm32_fmc2_nand.c: In function 'stm32_fmc2_write_data':
   drivers/mtd/nand/raw/stm32_fmc2_nand.c:872:17: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     if (IS_ALIGNED((u32)buf, sizeof(u32)) && IS_ALIGNED(len, sizeof(u32))) {
                    ^
   include/linux/kernel.h:62:30: note: in definition of macro 'IS_ALIGNED'
    #define IS_ALIGNED(x, a)  (((x) & ((typeof(x))(a) - 1)) == 0)
                                 ^
   drivers/mtd/nand/raw/stm32_fmc2_nand.c:872:17: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     if (IS_ALIGNED((u32)buf, sizeof(u32)) && IS_ALIGNED(len, sizeof(u32))) {
                    ^
   include/linux/kernel.h:62:44: note: in definition of macro 'IS_ALIGNED'
    #define IS_ALIGNED(x, a)  (((x) & ((typeof(x))(a) - 1)) == 0)
                                               ^
   In file included from include/linux/module.h:18,
                    from drivers/mtd/nand/raw/stm32_fmc2_nand.c:13:
   drivers/mtd/nand/raw/stm32_fmc2_nand.c: At top level:
   drivers/mtd/nand/raw/stm32_fmc2_nand.c:1726:26: error: expected ',' or ';' before 'DRIVER_NAME'
    MODULE_ALIAS("platform:" DRIVER_NAME);
                             ^~~~~~~~~~~
   include/linux/moduleparam.h:24:26: note: in definition of macro '__MODULE_INFO'
      = __stringify(tag) "=" info
                             ^~~~
   include/linux/module.h:164:30: note: in expansion of macro 'MODULE_INFO'
    #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
                                 ^~~~~~~~~~~
   drivers/mtd/nand/raw/stm32_fmc2_nand.c:1726:1: note: in expansion of macro 'MODULE_ALIAS'
    MODULE_ALIAS("platform:" DRIVER_NAME);
    ^~~~~~~~~~~~

vim +838 drivers/mtd/nand/raw/stm32_fmc2_nand.c

   826	
   827	void stm32_fmc2_read_data(struct nand_chip *chip, void *buf,
   828				  unsigned int len, bool force_8bit)
   829	{
   830		struct stm32_fmc2 *fmc2 = nand_get_controller_data(chip);
   831		void __iomem *io_addr_r = fmc2->data_base[fmc2->cs_sel];
   832		u8 *p = buf;
   833		unsigned int i;
   834	
   835		if (force_8bit)
   836			goto read_8bit;
   837	
 > 838		if (IS_ALIGNED((u32)buf, sizeof(u32)) && IS_ALIGNED(len, sizeof(u32))) {
   839			u32 *p = buf;
   840	
   841			len >>= 2;
   842			for (i = 0; i < len; i++)
   843				p[i] = readl_relaxed(io_addr_r);
   844			return;
   845		}
   846	
   847		if (chip->options & NAND_BUSWIDTH_16) {
   848			u16 *p = buf;
   849	
   850			len >>= 1;
   851			for (i = 0; i < len; i++)
   852				p[i] = readw_relaxed(io_addr_r);
   853			return;
   854		}
   855	
   856	read_8bit:
   857		for (i = 0; i < len; i++)
   858			p[i] = readb_relaxed(io_addr_r);
   859	}
   860	

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