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77 lines
2.9 KiB
77 lines
2.9 KiB
* Skyworks Solutions, Inc. AAT1290 Current Regulator for Flash LEDs |
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The device is controlled through two pins: FL_EN and EN_SET. The pins when, |
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asserted high, enable flash strobe and movie mode (max 1/2 of flash current) |
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respectively. In order to add a capability of selecting the strobe signal source |
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(e.g. CPU or camera sensor) there is an additional switch required, independent |
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of the flash chip. The switch is controlled with pin control. |
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Required properties: |
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- compatible : Must be "skyworks,aat1290". |
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- flen-gpios : Must be device tree identifier of the flash device FL_EN pin. |
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- enset-gpios : Must be device tree identifier of the flash device EN_SET pin. |
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Optional properties: |
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- pinctrl-names : Must contain entries: "default", "host", "isp". Entries |
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"default" and "host" must refer to the same pin configuration |
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node, which sets the host as a strobe signal provider. Entry |
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"isp" must refer to the pin configuration node, which sets the |
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ISP as a strobe signal provider. |
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A discrete LED element connected to the device must be represented by a child |
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node - see Documentation/devicetree/bindings/leds/common.txt. |
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Required properties of the LED child node: |
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- led-max-microamp : see Documentation/devicetree/bindings/leds/common.txt |
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- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt |
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Maximum flash LED supply current can be calculated using |
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following formula: I = 1A * 162kohm / Rset. |
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- flash-max-timeout-us : see Documentation/devicetree/bindings/leds/common.txt |
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Maximum flash timeout can be calculated using following |
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formula: T = 8.82 * 10^9 * Ct. |
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Optional properties of the LED child node: |
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- function : see Documentation/devicetree/bindings/leds/common.txt |
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- color : see Documentation/devicetree/bindings/leds/common.txt |
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- label : see Documentation/devicetree/bindings/leds/common.txt (deprecated) |
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Example (by Ct = 220nF, Rset = 160kohm and exynos4412-trats2 board with |
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a switch that allows for routing strobe signal either from the host or from |
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the camera sensor): |
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#include "exynos4412.dtsi" |
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#include <dt-bindings/leds/common.h> |
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led-controller { |
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compatible = "skyworks,aat1290"; |
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flen-gpios = <&gpj1 1 GPIO_ACTIVE_HIGH>; |
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enset-gpios = <&gpj1 2 GPIO_ACTIVE_HIGH>; |
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pinctrl-names = "default", "host", "isp"; |
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pinctrl-0 = <&camera_flash_host>; |
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pinctrl-1 = <&camera_flash_host>; |
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pinctrl-2 = <&camera_flash_isp>; |
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camera_flash: led { |
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function = LED_FUNCTION_FLASH; |
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color = <LED_COLOR_ID_WHITE>; |
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led-max-microamp = <520833>; |
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flash-max-microamp = <1012500>; |
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flash-max-timeout-us = <1940000>; |
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}; |
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}; |
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&pinctrl_0 { |
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camera_flash_host: camera-flash-host { |
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samsung,pins = "gpj1-0"; |
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samsung,pin-function = <1>; |
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samsung,pin-val = <0>; |
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}; |
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camera_flash_isp: camera-flash-isp { |
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samsung,pins = "gpj1-0"; |
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samsung,pin-function = <1>; |
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samsung,pin-val = <1>; |
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}; |
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};
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