leds-aat1290.txt

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    1 * Skyworks Solutions, Inc. AAT1290 Current Regulator for Flash LEDs
    2 
    3 The device is controlled through two pins: FL_EN and EN_SET. The pins when,
    4 asserted high, enable flash strobe and movie mode (max 1/2 of flash current)
    5 respectively. In order to add a capability of selecting the strobe signal source
    6 (e.g. CPU or camera sensor) there is an additional switch required, independent
    7 of the flash chip. The switch is controlled with pin control.
    8 
    9 Required properties:
   10 
   11 - compatible : Must be "skyworks,aat1290".
   12 - flen-gpios : Must be device tree identifier of the flash device FL_EN pin.
   13 - enset-gpios : Must be device tree identifier of the flash device EN_SET pin.
   14 
   15 Optional properties:
   16 - pinctrl-names : Must contain entries: "default", "host", "isp". Entries
   17                 "default" and "host" must refer to the same pin configuration
   18                 node, which sets the host as a strobe signal provider. Entry
   19                 "isp" must refer to the pin configuration node, which sets the
   20                 ISP as a strobe signal provider.
   21 
   22 A discrete LED element connected to the device must be represented by a child
   23 node - see Documentation/devicetree/bindings/leds/common.txt.
   24 
   25 Required properties of the LED child node:
   26 - led-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
   27 - flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
   28                        Maximum flash LED supply current can be calculated using
   29                        following formula: I = 1A * 162kohm / Rset.
   30 - flash-max-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
   31                          Maximum flash timeout can be calculated using following
   32                          formula: T = 8.82 * 10^9 * Ct.
   33 
   34 Optional properties of the LED child node:
   35 - function : see Documentation/devicetree/bindings/leds/common.txt
   36 - color : see Documentation/devicetree/bindings/leds/common.txt
   37 - label : see Documentation/devicetree/bindings/leds/common.txt (deprecated)
   38 
   39 Example (by Ct = 220nF, Rset = 160kohm and exynos4412-trats2 board with
   40 a switch that allows for routing strobe signal either from the host or from
   41 the camera sensor):
   42 
   43 #include "exynos4412.dtsi"
   44 #include <dt-bindings/leds/common.h>
   45 
   46 led-controller {
   47         compatible = "skyworks,aat1290";
   48         flen-gpios = <&gpj1 1 GPIO_ACTIVE_HIGH>;
   49         enset-gpios = <&gpj1 2 GPIO_ACTIVE_HIGH>;
   50 
   51         pinctrl-names = "default", "host", "isp";
   52         pinctrl-0 = <&camera_flash_host>;
   53         pinctrl-1 = <&camera_flash_host>;
   54         pinctrl-2 = <&camera_flash_isp>;
   55 
   56         camera_flash: led {
   57                 function = LED_FUNCTION_FLASH;
   58                 color = <LED_COLOR_ID_WHITE>;
   59                 led-max-microamp = <520833>;
   60                 flash-max-microamp = <1012500>;
   61                 flash-max-timeout-us = <1940000>;
   62         };
   63 };
   64 
   65 &pinctrl_0 {
   66         camera_flash_host: camera-flash-host {
   67                 samsung,pins = "gpj1-0";
   68                 samsung,pin-function = <1>;
   69                 samsung,pin-val = <0>;
   70         };
   71 
   72         camera_flash_isp: camera-flash-isp {
   73                 samsung,pins = "gpj1-0";
   74                 samsung,pin-function = <1>;
   75                 samsung,pin-val = <1>;
   76         };
   77 };

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