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leds: provide helper to register "leds-gpio" devices

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This function makes a deep copy of the platform data to allow it to live
in init memory.  For a kernel that supports several machines and so
includes the definition for several leds-gpio devices this saves quite
some memory because all but one definition can be free'd after boot.

As the function is used by arch code it must be builtin and so cannot go
into leds-gpio.c.

[akpm@linux-foundation.org: s/CONFIG_LED_REGISTER_GPIO/CONFIG_LEDS_REGISTER_GPIO/]
Signed-off-by: Uwe Kleine-König  <u.kleine-koenig@pengutronix.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Acked-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: H Hartley Sweeten <hartleys@visionengravers.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Uwe Kleine-König 2011-05-24 17:13:29 -07:00 • committed by Linus Torvalds
parent 9b2da53f76
commit 4440673a95
5 changed files with 53 additions and 1 deletions
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2
include/linux/leds.h
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@ -207,5 +207,7 @@ struct gpio_led_platform_data {
unsigned long *delay_off);
};
struct platform_device *gpio_led_register_device(
int id, const struct gpio_led_platform_data *pdata);
#endif /* __LINUX_LEDS_H_INCLUDED */