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misc: atmel_pwm: only build for supported platforms 

There is architecture code in mach-at91 that depends on the
CONFIG_ATMEL_PWM symbol in order to call the soc-specific
at91_add_device_pwm function. While all of this is about code
that will be removed in the future, using DT probing and
the PWM framework, we currently get a build failure:

arch/arm/mach-at91/built-in.o: In function `at91_pwm_leds':
arch/arm/mach-at91/leds.c:88: undefined reference to `at91_add_device_pwm'

This patch ensures we only try to build this driver on
platforms on which it will build and work.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2014-05-08 16:56:28 +02:00 committed by Greg Kroah-Hartman
parent c919951d94
commit 1690e35f9b
1 changed files with 2 additions and 1 deletions
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drivers/misc/Kconfig
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@ -53,7 +53,8 @@ config AD525X_DPOT_SPI
config ATMEL_PWM config ATMEL_PWM
tristate "Atmel AT32/AT91 PWM support" tristate "Atmel AT32/AT91 PWM support"
depends on HAVE_CLK && (AVR32 || ARCH_AT91 || COMPILE_TEST) depends on HAVE_CLK
depends on AVR32 || AT91SAM9263 || AT91SAM9RL || AT91SAM9G45
help help
This option enables device driver support for the PWM channels This option enables device driver support for the PWM channels
on certain Atmel processors. Pulse Width Modulation is used for on certain Atmel processors. Pulse Width Modulation is used for