On 2016年07月12日 00:04, Arnd Bergmann wrote:

On Sunday, July 10, 2016 3:27:21 PM CEST Wan Zongshun wrote:

quoted

+ifeq ($(CONFIG_SOC_NUC970),)
  obj-y                          := irq.o time.o mfp.o gpio.o clock.o
  obj-y                          += clksel.o dev.o cpu.o
+endif
  # W90X900 CPU support files

When mfp.o is disabled like this, I get a link error in two drivers
using the exported interface:

ERROR: "mfp_set_groupg" [drivers/spi/spi-nuc900.ko] undefined!
ERROR: "mfp_set_groupi" [drivers/input/keyboard/w90p910_keypad.ko] undefined!

Why remove mfp modules? this multifunction pin driver should be used for 
those two drivers, if no mfp_set_groupX, I don't think driver can work.

Now mfp has standard driver subsystem?

Any idea for a better migration strategy?

	Arnd