mirror of https://gitee.com/openkylin/linux.git
42 lines
1.5 KiB
Plaintext
42 lines
1.5 KiB
Plaintext
|
* Skyworks Solutions, Inc. AAT1290 Current Regulator for Flash LEDs
|
||
|
|
|
||
|
|
The device is controlled through two pins: FL_EN and EN_SET. The pins when,
|
||
|
|
asserted high, enable flash strobe and movie mode (max 1/2 of flash current)
|
||
|
|
respectively.
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
|
||
|
|
- compatible : Must be "skyworks,aat1290".
|
||
|
|
- flen-gpios : Must be device tree identifier of the flash device FL_EN pin.
|
||
|
|
- enset-gpios : Must be device tree identifier of the flash device EN_SET pin.
|
||
|
|
|
||
|
|
A discrete LED element connected to the device must be represented by a child
|
||
|
|
node - see Documentation/devicetree/bindings/leds/common.txt.
|
||
|
|
|
||
|
|
Required properties of the LED child node:
|
||
|
|
- led-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
|
||
|
|
- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
|
||
|
|
Maximum flash LED supply current can be calculated using
|
||
|
|
following formula: I = 1A * 162kohm / Rset.
|
||
|
|
- flash-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
|
||
|
|
Maximum flash timeout can be calculated using following
|
||
|
|
formula: T = 8.82 * 10^9 * Ct.
|
||
|
|
|
||
|
|
Optional properties of the LED child node:
|
||
|
|
- label : see Documentation/devicetree/bindings/leds/common.txt
|
||
|
|
|
||
|
|
Example (by Ct = 220nF, Rset = 160kohm):
|
||
|
|
|
||
|
|
aat1290 {
|
||
|
|
compatible = "skyworks,aat1290";
|
||
|
|
flen-gpios = <&gpj1 1 GPIO_ACTIVE_HIGH>;
|
||
|
|
enset-gpios = <&gpj1 2 GPIO_ACTIVE_HIGH>;
|
||
|
|
|
||
|
|
camera_flash: flash-led {
|
||
|
|
label = "aat1290-flash";
|
||
|
|
led-max-microamp = <520833>;
|
||
|
|
flash-max-microamp = <1012500>;
|
||
|
|
flash-timeout-us = <1940000>;
|
||
|
|
};
|
||
|
|
};
|