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misc: atmel_pwm: only build for supported platforms

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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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3
drivers/misc/Kconfig
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@ -53,7 +53,8 @@ config AD525X_DPOT_SPI
config ATMEL_PWM
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
This option enables device driver support for the PWM channels
on certain Atmel processors. Pulse Width Modulation is used for