On 12/04/2013 02:46 AM, Huang Shijie wrote:

? 2013?11?29? 22:52, Angus Clark ??:

quoted

    int (*write_reg)(struct spi_nor_info *info,
             uint8_t cmd, uint8_t *reg, int len,
             int wren, int wtr);

I guess you add the 'wren' for the issuing write-enable before issuing
the 'cmd'.

but what's 'wtr' for? i do not know what's the meaning of the 'wtr'.

'wtr' is for "Wait 'til Ready".  Some register writes are instant, while others
require polling of the "Write In Progress" bit.

Cheers,

Angus