skyworks,aat1290.yaml

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    1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/leds/skyworks,aat1290.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Skyworks Solutions, Inc. AAT1290 Current Regulator for Flash LEDs
    8 
    9 maintainers:
   10   - Jacek Anaszewski <jacek.anaszewski@gmail.com>
   11   - Krzysztof Kozlowski <krzk@kernel.org>
   12 
   13 description: |
   14   The device is controlled through two pins:: FL_EN and EN_SET. The pins when,
   15   asserted high, enable flash strobe and movie mode (max 1/2 of flash current)
   16   respectively. In order to add a capability of selecting the strobe signal
   17   source (e.g. CPU or camera sensor) there is an additional switch required,
   18   independent of the flash chip. The switch is controlled with pin control.
   19 
   20 properties:
   21   compatible:
   22     const: skyworks,aat1290
   23 
   24   enset-gpios:
   25     maxItems: 1
   26     description: EN_SET pin
   27 
   28   flen-gpios:
   29     maxItems: 1
   30     description: FL_EN pin
   31 
   32   led:
   33     $ref: common.yaml#
   34     unevaluatedProperties: false
   35 
   36     properties:
   37       led-max-microamp: true
   38 
   39       flash-max-microamp:
   40         description: |
   41           Maximum flash LED supply current can be calculated using following
   42           formula:: I = 1A * 162 kOhm / Rset.
   43 
   44       flash-max-timeout-us:
   45         description: |
   46           Maximum flash timeout can be calculated using following formula::
   47             T = 8.82 * 10^9 * Ct.
   48 
   49     required:
   50       - flash-max-microamp
   51       - flash-max-timeout-us
   52       - led-max-microamp
   53 
   54   pinctrl-names:
   55     items:
   56       - const: default
   57       - const: host
   58       - const: isp
   59 
   60   pinctrl-0: true
   61   pinctrl-1: true
   62   pinctrl-2: true
   63 
   64 required:
   65   - compatible
   66   - enset-gpios
   67   - flen-gpios
   68   - led
   69 
   70 additionalProperties: false
   71 
   72 examples:
   73   - |
   74     #include <dt-bindings/gpio/gpio.h>
   75     #include <dt-bindings/leds/common.h>
   76 
   77     // Ct = 220 nF, Rset = 160 kOhm
   78     led-controller {
   79         compatible = "skyworks,aat1290";
   80         flen-gpios = <&gpj1 1 GPIO_ACTIVE_HIGH>;
   81         enset-gpios = <&gpj1 2 GPIO_ACTIVE_HIGH>;
   82 
   83         pinctrl-names = "default", "host", "isp";
   84         pinctrl-0 = <&camera_flash_host>;
   85         pinctrl-1 = <&camera_flash_host>;
   86         pinctrl-2 = <&camera_flash_isp>;
   87 
   88         led {
   89             function = LED_FUNCTION_FLASH;
   90             color = <LED_COLOR_ID_WHITE>;
   91             led-max-microamp = <520833>;
   92             flash-max-microamp = <1012500>;
   93             flash-max-timeout-us = <1940000>;
   94         };
   95     };

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