a7d878af94
Add bindings to support LEDs defined as of_platform devices in addition to the existing bindings for platform devices. New options in Kconfig allow the platform binding code and/or the of_platform code to be turned on. The of_platform code is of course only available on archs that have OF support. The existing probe and remove methods are refactored to use new functions create_gpio_led(), to create and register one led, and delete_gpio_led(), to unregister and free one led. The new probe and remove methods for the of_platform driver can then share most of the common probe and remove code with the platform driver. The suspend and resume methods aren't shared, but they are very short. The actual led driving code is the same for LEDs created by either binding. The OF bindings are based on patch by Anton Vorontsov <avorontsov@ru.mvista.com>. They have been extended to allow multiple LEDs per device. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Sean MacLennan <smaclennan@pikatech.com> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
44 lines
1.3 KiB
Plaintext
44 lines
1.3 KiB
Plaintext
LEDs connected to GPIO lines
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Required properties:
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- compatible : should be "gpio-leds".
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Each LED is represented as a sub-node of the gpio-leds device. Each
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node's name represents the name of the corresponding LED.
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LED sub-node properties:
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- gpios : Should specify the LED's GPIO, see "Specifying GPIO information
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for devices" in Documentation/powerpc/booting-without-of.txt. Active
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low LEDs should be indicated using flags in the GPIO specifier.
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- label : (optional) The label for this LED. If omitted, the label is
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taken from the node name (excluding the unit address).
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- linux,default-trigger : (optional) This parameter, if present, is a
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string defining the trigger assigned to the LED. Current triggers are:
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"backlight" - LED will act as a back-light, controlled by the framebuffer
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system
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"default-on" - LED will turn on
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"heartbeat" - LED "double" flashes at a load average based rate
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"ide-disk" - LED indicates disk activity
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"timer" - LED flashes at a fixed, configurable rate
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Examples:
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leds {
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compatible = "gpio-leds";
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hdd {
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label = "IDE Activity";
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gpios = <&mcu_pio 0 1>; /* Active low */
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linux,default-trigger = "ide-disk";
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};
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};
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run-control {
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compatible = "gpio-leds";
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red {
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gpios = <&mpc8572 6 0>;
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};
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green {
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gpios = <&mpc8572 7 0>;
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};
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}
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