1 * Skyworks Solutions, Inc. AAT1290 Current Regulator for Flash LEDs
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.
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.
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.
22 A discrete LED element connected to the device must be represented by a child
23 node - see Documentation/devicetree/bindings/leds/common.txt.
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.
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)
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
43 #include "exynos4412.dtsi"
44 #include <dt-bindings/leds/common.h>
47 compatible = "skyworks,aat1290";
48 flen-gpios = <&gpj1 1 GPIO_ACTIVE_HIGH>;
49 enset-gpios = <&gpj1 2 GPIO_ACTIVE_HIGH>;
51 pinctrl-names = "default", "host", "isp";
52 pinctrl-0 = <&camera_flash_host>;
53 pinctrl-1 = <&camera_flash_host>;
54 pinctrl-2 = <&camera_flash_isp>;
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>;
66 camera_flash_host: camera-flash-host {
67 samsung,pins = "gpj1-0";
68 samsung,pin-function = <1>;
69 samsung,pin-val = <0>;
72 camera_flash_isp: camera-flash-isp {
73 samsung,pins = "gpj1-0";
74 samsung,pin-function = <1>;
75 samsung,pin-val = <1>;