FAQ: [#6998] Kernel compile error if CONFIG_GPIOLIB = n(2012)

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[#6998] Kernel compile error if CONFIG_GPIOLIB = n

Submitted By: Mike Sinkovsky

Open Date

2012-03-13 01:40:21     Close Date

2012-03-29 03:27:45

Priority:

Medium     Assignee:

Bob Liu

Status:

Closed     Fixed In Release:

N/A

Found In Release:

N/A     Release:

trunk

Category:

Make Errors     Board:

Custom

Processor:

ALL     Silicon Revision:

Is this bug repeatable?:

Yes     Resolution:

Fixed

Uboot version or rev.:

    Toolchain version or rev.:

trunk

App binary format:

N/A     

Summary: Kernel compile error if CONFIG_GPIOLIB = n

Details:

 

In trunk kernel, if checkbox "GPIO Support" is unset (CONFIG_GPIOLIB=n), I have comilation error:

 

=======

  CC      arch/blackfin/kernel/bfin_gpio.o

In file included from /TRIKOM/KD3U-KCP1/.bfin-kernel/arch/blackfin/include/asm/gpio.h:265,

                 from arch/blackfin/kernel/bfin_gpio.c:15:

include/asm-generic/gpio.h: In function ‘gpio_get_value_cansleep’:

include/asm-generic/gpio.h:212: error: implicit declaration of function ‘__gpio_get_value’

include/asm-generic/gpio.h: In function ‘gpio_set_value_cansleep’:

include/asm-generic/gpio.h:218: error: implicit declaration of function ‘__gpio_set_value’

=======

 

If CONFIG_GPIOLIB=y - all compiles and works, but with notable performance degradation when doing intensive GPIO bitbanging.

 

Follow-ups

 

--- Mike Sinkovsky                                           2012-03-29 03:15:49

Tested, now works.

Thanks.

 

 

 

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