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build: define PWM_SUPPORT arch feature flag

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As the PWM has its own sub-system in the Linux kernel,
I think it should be handled in the same way as GPIO, RTC, PCI...

This patch introduces a specific feature flag "pwm" and the
"leds-pwm" kernel module as the first customer.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Christian Lamparter
2020-08-29 23:07:28 +02:00
parent fed1788689
commit f6fbc39706
3 changed files with 20 additions and 0 deletions
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16
package/kernel/linux/modules/leds.mk
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@@ -159,3 +159,19 @@ define KernelPackage/leds-pca963x/description
endef
$(eval $(call KernelPackage,leds-pca963x))
define KernelPackage/leds-pwm
SUBMENU:=$(LEDS_MENU)
TITLE:=PWM driven LED Support
KCONFIG:=CONFIG_LEDS_PWM
DEPENDS:= @PWM_SUPPORT
FILES:=$(LINUX_DIR)/drivers/leds/leds-pwm.ko
AUTOLOAD:=$(call AutoLoad,60,leds-pwm,1)
endef
define KernelPackage/leds-pwm/description
This option enables support for pwm driven LEDs
endef
$(eval $(call KernelPackage,leds-pwm))